The brake system is an integral part of the safety of any car. If suddenly the brake pedal became solid or too soft, then this reason to think about the need for careful inspection.
On the quality of the operation of the brake system, the external elements that the driver interacts during riding is most often said. It is the free course of the brake pedal that is quite comfortable for his leg, provides good car control. In general, there is a solid brake pedal, soft or medium. There are several reasons for each.
Too rigid brake pedal is not always such a number of standard and usual causes. The problem may be in the specifics of a particular model. Sometimes situations occur when a solid brake pedal is a banal feature of a particular manufacturer. The same big stroke of the brake pedal is also peculiar to some of its types. When the brake pedal is not returned, this is a huge problem.
If the pedal is oak brake, that is, it is quite tightly pressed, then there are two options here - either visit the car service, or try to solve the problem itself, which is a considerable risk. In general, there is a decision immediately, since riding with it is very dangerous not only for the driver itself, but also for others.
There are eight most common causes:
All of the above is primarily indicating that only in the case of poor car care, a variety of unpleasant situations appear. For example, it is necessary to regularly check how well the vacuum amplifier does.
For such diagnostics there are a number of ways:
- The first way is to turn on the engine and give it to work until the system is completely discharged. If after this pedal brakes oak, then the problem is in the hose or amplifier. Then you should stop the work of the engine, let him stand for a few minutes, and then again check the operation of the system and trace the process of this process from "A" to "I". If, after such a procedure, the braking system clearly lacks "ease" during its response, then the amplifier valve is most likely to blame;
- The second way is to press when not working engine, in order to remove the discharge and completely discharge the brake system. Then you need to turn on the motor without releasing the pedal. When the amplifier is in full-fledged working condition, everything is fine. Otherwise, it is necessary to check the performance of its details.
Why the pedal is soft
Due to certain problems, the brake pedal pedal may also be faulty. Such a nuisance can go "in full" together with other concomitant. Very often soft brake pedal is the direct cause of a significant deterioration in the car control.
Soft brake pedal can be a simple feature of the model. The cause of faults may be air from entering the corresponding system. It is fixed all by pumping the brake itself to secure it from possible troubleshooting.
In turn, the air can enter the system in many ways, and if there are problems with her, then he is most likely to blame. The pipeline may well lose sealing or even burst in this case. Because of the breakdown of the main cylinder, in which the brake fluid begins, the corresponding problems arise. The accompanying breakdown is often a piston jam. It is advisable to diagnose cylinders and check the braking fluid. It would be quite nice to also carry out a complete testing of the machine to determine the presence of hidden problems, if any.
Video "Signs and malfunctions of a vacuum amplifier of the brake system"
The record shows how to replace the vacuum amplifier on the VAZ-2109 brand car.
Hitch when the brake pedal is pressed, one of the most common problems that are found in the operation of both domestic and foreign production cars.
The fact is that most drivers react sensitively to various sounds that accompanied the operation of the car mechanisms. An exception is not the case when the brake is heard when the brake pedal is heard.
But it is not always worth falling into a panic - especially in cases where the hiss of the brake pedal when pressed it does not affect the efficiency of the brake system. In order to understand the nature of this sound, consider in more detail the operation of the vacuum brake amplifier.
Brakes - one of the main nodes of any car. And if when you press the brake pedal, the embroidery is heard, the design itself fails or, on the contrary, it is unnecessary - you need to urgently correct the position, do not delay and not postpone the possible repairs in a long box. Or at least diagnose the causes of trouble. Knowledge and understanding of the problem accompanies its rapid resolution, and timely correction can save from unforeseen situations on the road.
Hitch when pressed on the brake pedal - the main reasons
And so, why do they still hide the brakes when pressed on the pedal? In fact, there are not many reasons for this problem - only two:
- A vacuum amplifier has failed
- The brake system was delivered
We will talk about these problems and how to solve them in our current article.
The level of hiss when you press the pedal - what is normal and which is not
There is a category of drivers who listen to every slightest screen or sound very carefully, and try to hear signs of breakdown in them. The car is a mechanical vehicle in which a sufficient number of nodes and mechanisms that can create a small permissible noise level. Such should not be especially listening and immediately go to the service center, in which you, with great perseverance, will definitely find malfunctions and will be offered to eliminate. Brake pedal, when pressed, in most cases there is a slight hiss.
It must be said that checking the brakes for the presence of various noise is needed in the wound state of the car. At the same time, glass and doors must be closed, and all the devices that can produce additional noise is necessary, if possible, turn off. A small noise level in the cabin may occur due to the design feature of the brake system, which, as a rule, has two vacuum chambers. When you click on the brake pedal, there are different pressure on them, which is why there is a small hiss. If it is minimal, and almost imperceptible, there will be no problems in braking.
If at idle, when you press the pedal, loud, choking sound or strong hiss, and it is pressed tight, then you need to look for malfunctions. First of all, the vacuum amplifier is checked. A tight pedal is not a sign of breakdowns of this detail, especially in a strong frost, but, together with hiss, she talks about the need for his check.
The brake system is used by the driver constantly, so the elements of the system are under load. What style of driving would not preach the driver, over time it is necessary to check the brakes for good condition. This will ensure the security of all participants in the movement.
In the vacuum amplifier there is a diaphragm, which over time, like any rubber material, starts to burst, crack. It does not allow fully fulfillment to fulfill the functional purpose - to pump the required pressure. Get out of standing can be an intake vacuum, but more often this is the first option.
Brake vacuum amplifier - how to diagnose malfunction
Diagnose a malfunction of a vacuum brake amplifier is not difficult, it becomes noticeable - when you press the brake pedal becomes solid. But an indirect sign of malfunction can be changed idling speed when the pedal is pressed . This is due to the depletion of the fuel mixture caused by the "excessive" air in the engine cylinders, which may even stumble, if the "SUPPLC" is too strong.
Most often, this is due to damage to the brake amplifier diaphragm. Moreover, it is completely optional on old age - sometimes sealing rings of the main brake cylinder skip the brake fluid, and it enters the amplifier housing.
Some car owners are committed to independently sort out the brake amplifier - even repair kits are sold to domestic cars. But, in general, this is an ungrateful occupation - the "Vacuumnik" hull is unspeborified, and neatly and tightly connect its parts at all.
In addition, the operation of the brake system is also influenced by the adjustment of the protrusion of the "Vacuumnik" rod from the housing - the wrong setting can reduce the efficiency of the amplifier or cause incomplete "discharge" of working brake cylinders. There is a way to check the amplifier among motorists - you run the engine, having touched the brake. When the motor starts, the pedal must "go to the floor".
The process of removing the vacuum brake amplifier If the amplifier is faulty, the brake pedal will still remain "tight". In general, the hiss associated with the work of the vacuum brake amplifier is a normal phenomenon. But in the case when its volume has increased without visible reasons, prepare for the replacement of the vacuum amplifier until it refused.
How to check the brake vacuum amplifier
The braking system of the car in constant mode is subjected to loads, and in the so-called aggressive style ride through the city streets, these loads are increasingly increasing. In general, the effects of this kind are carried out constantly, even if you prefer a loyal level of speed. Therefore, the brake system should be diagnosed with enviable regularity, in order to provide a motorist to the maximum degree of security. The malfunction in the vacuum amplifier happens, as a rule, due to the loss of condition of the diaphragm under this node. It can burst or be covered by cracks also takes place natural obsolescence of rubber and loss of her qualities. What is the result? The diaphragm ceases to form a vacuum. In some cases, the exhaust valve can be supplied.
To verify the performance of the vacuum amplifier, you need to resort to the following manipulations:
In general, with every press on the brake pedal, the engine turnover will be slightly decline, however, if the difference becomes essential, it is worth visually diagnosing the hose connecting the amplifier with a power unit. If it has any defects, then the collector will become an unreleased, respectively, the normal mixing formation does not have to have the motor and the motor will work unstable. The output is simple - change the spoiled hose.
Replacing the vacuum brake amplifier on the VAZ 2107 video
Air in brakes how to fix the problem
The brake vacuum is the most frequent reason for another thing if the texture of sound differs significantly on the hearing. That is, the hiss turns out quite loud and as if choking.
At the same time, when applied to the brake pedal on the cold, we feel an excessive tightness of its stroke. And also - the buoyancy of the rotor of the engine (and sometimes to stall). In such cases, close attention should be paid to the vacuum amplifier as a possible cause of malfunctions. 
Well, a tight pedal, of course, can still be from frost, for example, until the main thing warms. But the turns and rather strong hiss are already direct signs that you need to look under the hood! How to check it?
The brake system of the car is subjected to constant loads, and with the so-called sports style ride in the city - also overloads. It happens regularly even with a measured and leisure rhythm - you can not get anywhere from this problem. Therefore, this node must be regularly tested to provide the driver and passengers to maximize ride safety. So in history with vacuum for brakes. As a rule, malfunctions occur due to the failure of a special diaphragm located inside the device. 
It bursts, cracks, ceases to perform responsibilities assigned to it - to pump a vacuum. Sometimes failures give the exhaust valve. Available to each driver checking the vacuum performance on its own by the following way. We bring the engine and give him some time to work at idle so that he reached;
- Moach motor;
- Click on the brake;
- The first pressing will not differ from the usual, standard when the unit is running.
- The pedal must be squeezed as much as possible: In this case, a diaphragm is extension in the amplifier and a vacuum is created;
We let go of the pedal, squeeze it again. If with the system of nonlade, then during the second approach, the vacuum will not be able to be created, and you will be tactile to observe an uncharacteristic small course of the pedal itself. These changes talk about breakage in the brake amplifier.
How to pump brakes in 5 minutes - video
Auto with defective brakes is a dangerous weapon that can lead to mass destruction. Various technical problems can bring the vehicle to the state of uncontrollability. At the same time, to stop the car, which refused everything can only a clash that occurred with any other car, the nearest structure or pillars. In such a situation, it is impossible to exclude even falling into a ditch. Although if the driver is experienced and he carefully relates to each malfunction, such a defect as a soft brake pedal, he will notice immediately and will take all the necessary activities to avoid a unpleasant focus.
Impeccable brakes work very important when traveling
If you do not pay attention to such a significant lack of a braking system, the car owner will soon be waiting for inside-free prospects - you can either be the victim of an accident, or its culprit. And everything is only because of their own inattention or laziness. Timely diagnostics will allow to remove all defects and replace the brake fluid if necessary. The car enthusiast should feel the state of the brake pedal and with any of its deviation to react clearly, since the serviceable device will provide a quiet ride.
The brake pedal "went to the floor" - what to do?
If the brake pedal has become soft, i.e. it began to fall significantly, - it is necessary to check the entire braking system of the machine without delay. Most likely, the diagnosis will be required in the service center and its further repair.
The main thing is to contact the service center in time. It is important to remember that all malfunctions of this kind are fraught with their consequences. Brakes with a defect may refuse while driving, it is likely that it can occur on a lively avenue, stop such a car, even on average speed can only collide with some other vehicle or construction. If the brake pedal is easily pressed, there may be several reasons:
- the brake cylinder is not able to hold the liquid and the corresponding pressure may have significant wear cuffs and gaskets from rubber;
- in the brake tank is filled with an unsuitable liquid;
- there were malfunctions with pads or discs;
- defects are traced in the vacuum pump;
- on the pedals of traction is possible manifestation of rust.
Problems with the brake system unequivocally says the presence of vibration, hissing and tapping in the pedal during its clamp.
Solve the problem of soft pedal
So, the most common problem is a bad low-quality liquid, due to the fact that it may not approach a certain model of the car, the hoses may occur gradually. Rubber elements are not able to withstand such a fluid, they are resollected, increase in diameter, which leads to loss of tightness. If the brake pedal has become soft, it is best to undergo the diagnosis of the entire brake system, and defective elements.
The second reason is rust in traction. The exit here is one - the full replacement. You can determine such a malfunction by holding the brake pedal, if it remains downstairs and it will have to "raise" with progressive tools - the problem in the traction is definitely.
The wrong gap, which is located between the pedal and the cylinder, is also determined by the pedal clamp. If pressing immediately occurs easily and smoothly, and in the end the applied force has to double - most likely, the gap is incorrectly adjusted, the present pressure does not allow you to ignore normally and raise the pedal. We have to regulate and pump brakes.
Air traffic jokes also bring a lot of concerns that appear due to hose wear, they entail breakdowns in a vacuum pump. Brake cylinders lose part of the pressure, the pads are not moved, in view of which they cannot be pressed to the disk. Should check pads to the degree of existing one.
Tight Pedal Brakes - What to do?
The reasons for the brake pedal became solid, several may appear. It is worth noting that there are traditional malfunctions characteristic of most cars, and specific, which can occur only in some brake system models.
The hard pedal of the brake may appear in view of such reasons:
- vorary formed in the air filter. The fault disappears after replacing the filter;
- shooting valve. Fix everything can be replaced by the amplifier;
- damage in the diaphragm. The brake pedal will disappear after replacing the amplifier;
- tie faults in vacuum amplifier. It will be necessary to replace the tip;
- the poor quality functioning of the check valve, the valve must be changed;
- tightness disorders that cause fuel flow;
- defects in the hose coming from the amplifier to the collector. It is best to replace the hose. Should regularly check the condition of the hose. It normally functions only in a cold condition, any overheating makes it flexible and elastic, which is why bundles can appear. They reduce the bandwidth and cause malfunctions with brakes.
- weakening the fastening of the rubber hose on the fitting. It is treated by pulling the fastening clamp.
The tight brake pedal can be the result of bulk sealing rings located in the cylinders. Such a defect occurs after fuel and lubricants begin to peel on the surface. In this case, brake cylinders have to be repaired and.
No less concern gives the wrong function of the vacuum amplifier. It is necessary to check it regularly, for this before the start of the power unit should be pressed on the pedal, if the brake pedal is tightly pressed - there is a malfunction in an amplifier or hose.
In order to perccuously recognize the location with a malfunction, it takes 5 minutes after turning off the engine again to hold the pedal. If the brake pedal has become a tight second time - the amplifier valve is defective.
Conclusion
Many of the problems that brings the car owner to the tight or soft brake pedal, you can try to eliminate yourself. However, this will require "baggage" of certain knowledge and skills, if there is uncertainty in their own, it is better to send a car to a complete diagnostics to the service center.
If the brakes still summed up, then hope for engine braking Even despite the seeming foresight and serviceability of the car, the brake system can bring while driving, it is possible to exit such a situation, the engine is slowed down. After a complete stop, you need to call the tow truck, since the faulty brake system can present new surprises.
Good day, dear car enthusiasts! We will continue our research of the most typical brake system faults. Such a brake control, as a brake pedal, has several states of its position.
The first one that should be regular when pressing the pedal is carried out without tangible changes, without failures, jerks, without the application of special efforts, etc. The following two states of the pedal position are unpleasant for the driver, and causing a certain concern.
We are talking about when you have a tight brake pedal or vice versa, too soft brakes. With this position, when the brake pedal ceases to work in a regular, familiar mode, the driver's concern is justified. So, there have been any malfunctions, and required. Do not delay.
Why do you have a tight brake pedal
The reasons are the brake pedal suddenly become a tight, maybe a few, and it is not necessary to be traditional and characteristic of all types and brake models. However, consider the main, most characteristic causes, and the methods of their elimination.
In most faults, because of which the soft pedal of brakes becomes "to blame": either a vacuum amplifier or.
So, an increase in effort while pressing the brake pedal is due to:
- there was a clogging of the air filter of the vacuum amplifier. In this case, it is necessary to replace the air filter;
- the valve body is hijacking in a vacuum amplifier. Exit - replacement of a vacuum amplifier;
- the diaphragm of the vacuum amplifier is destroyed. Change vacuum amplifier;
- the tip of the vacuum amplifier is faulty - the tip is needed;
- hences or does not trigger the check valve in the vacuum amplifier, the replacement valve is required;
- the check valve of the vacuum amplifier is faulty (leakage), which allows the vacuum amplifier to fall into the cavity. It is necessary to change the vacuum amplifier assembly with the check valve;
- damaged hose connecting the vacuum amplifier with an intake manifold, Lido loosen the hose mount on the fitting. We change the hose, or tighten the fastening clamp. Read more about the hose of the vacuum brake amplifier. It is necessary to monitor the state systematically. Especially in the cold season. While the hose is not heated, it remains sufficiently rigid and the brakes work normally. After a short engine work, the hose heats up, it becomes more elastic, and if you have not noticed its bundle, for example, its throughput is reduced. There may be a problem with the brake pedal.
- in the working (wheeled) cylinders, sealing rings scattered. This can occur due to fuel and lubricants in them, or the use of poor-quality brake fluid. Repair of working brake cylinders, replacement of brake fluid on the recommended manufacturer.
A couple of ways to check the performance of a vacuum amplifier
Run the engine. The system creates a discharge. Now click on the brake. Hard brake pedal means a fault of the amplifier or hose. Loading the engine, wait about 5 minutes without clicking on the brake.
We concretize a malfunction. Click on the pedal. If the pedal still remains tough, then most likely the vacuum amplifier valve is defective.
Another test. When the engine is turned off, press the brake pedal several times to remove the discharge in the brake system. Not releasing brake pedal, run the engine. If the pedal slightly fall down, then everything is in order with the amplifier.
Why i have soft brakes
Soft brake pedal may indicate several faults. Rather, there are several reasons that the brake pedal, suddenly become soft. This effect can still be called :.
Soft brakes have traditional reasons:
- "» Brake system. Naturally, air removal is required, i.e. . The reason for "convulsion" can be: depressurize the system or low in an expansion tank;
- malfunction of the main brake cylinder:
- a malfunction of the working cylinder, for example, as a result of the jamming of the piston or booming the brake fluid. Repair of brake cylinders, or new.
Successes to you when conducting proper diagnosis and timely maintenance of the car brake system. As - in no way, and the brakes are our security with you.
