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The brake pedal fails - what to do?
The sensations that the driver experiences when the brake pedal “falls” during braking cannot be called pleasant, even if this does not cause any serious consequences. The reasons why the brake pedal fails usually lie in a violation of the tightness of the brake system circuits. However, we will consider their possible options in more detail, and also find out what needs to be done if the brake pedal fails, depending on the circumstances under which this happens.
What happens when there is a brake fluid leak?
Cracked brake hose
Unlike liquid, air tends to compress, which leads to failure of the brake pedal when braking.
If the brake system leaks, the following occurs. The driver presses the pedal, the brake fluid begins to flow out under pressure. After the pedal is released, air enters the system under vacuum. Unlike liquid, air tends to compress, which leads to failure of the brake pedal when braking. The most common culprits for leaks are brake wheel cylinders and frayed brake lines.
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Hissing when you press the brake pedal - the main causes and solutions to the problem
Hissing when you press the brake pedal is one of the most common problems encountered in the operation of both domestic and foreign-made cars.
The thing is that most drivers react sensitively to various sounds that accompany the operation of car mechanisms. An exception is the case when a hissing sound is heard when you press the brake pedal.
But it is not always worth panicking - especially in cases where the hissing of the brake pedal when pressed does not in any way affect the efficiency of the braking system. In order to understand the nature of this sound, let's take a closer look at the operation of the vacuum brake booster.
Brakes are one of the main components of any car. And if, when you press the brake pedal, you hear hissing, creaking, the structure itself fails or, on the contrary, is too hard, you need to urgently correct the situation, do not delay or shelve possible repairs. Or at least diagnose the causes of trouble. Knowledge and understanding of the problem leads to its fastest resolution, and timely correction can save you from unforeseen situations on the road.
Hissing when you press the brake pedal - the main reasons
So, why do the brakes still hiss when you press the pedal? In fact, there are not many reasons for this problem - only two:
- The vacuum booster has failed
- The brake system is airy
We will talk about these problems and ways to solve them in our article today.
The level of hissing when you press the pedal - which is normal and which is not
There is a category of drivers who listen very carefully to every slightest squeak or sound and try to hear signs of a breakdown. A car is a mechanical vehicle that contains a sufficient number of components and mechanisms that can create a small permissible noise level. You shouldn’t listen too much to this and go straight to the service center, where, with a lot of persistence, they will definitely find the problem and offer to fix it. The brake pedal, when pressed, in most cases emits a slight hiss.
Vacuum brake booster for VAZ 2109
It must be said that you need to check the brakes for various noises while the car is running. In this case, windows and doors should be closed, and all devices that can make additional noise should be turned off, if possible. A small noise level in the cabin may occur due to the design of the brake system, which, as a rule, has two vacuum chambers. When you press the brake pedal, different pressures arise in them, which is why a slight hiss occurs. If it is minimal and almost imperceptible, then there will be no problems when braking.
If at idle, when you press the pedal, you hear a loud, choking sound or a strong hiss, and it is pressed tightly, then you need to look for problems. First of all, the vacuum booster is checked. A stiff pedal is not a sign of a breakdown of this part, especially in severe frost, but, coupled with hissing, it indicates the need to check it.
The brake system is constantly used by the driver, so the elements of the system are under load. Whatever driving style the driver preaches, over time it is necessary to check the brakes for serviceability. This will ensure the safety of all road users.
The vacuum amplifier has a diaphragm, which over time, like any rubber material, begins to burst and crack. This does not allow it to fully fulfill its functional purpose - to pump up the necessary pressure. The intake vacuum can also fail, but more often this is the first option.
Vacuum brake booster - how to diagnose a malfunction
Diagnosing a faulty vacuum brake booster is not difficult; it becomes noticeable - when pressed, the brake pedal becomes hard. But an indirect sign of a malfunction can also be a change in idle speed when the pedal is pressed . This is due to a lean fuel mixture caused by “excess” air entering the engine cylinders, which may even stall if the “suction” is too strong.
Most often this is due to damage to the brake booster diaphragm. And it’s not necessarily due to old age - sometimes the sealing rings of the main brake cylinder leak brake fluid, and it gets into the booster housing.
New vacuum brake booster for VAZ 2109
Some car owners manage to rebuild the brake booster themselves - they even sell repair kits for domestic cars. But, in general, this is a thankless task - the body of the “vacuum generator” is non-separable, and not everyone can carefully and tightly connect its parts.
In addition, the operation of the brake system is also affected by adjusting the protrusion of the “vacuum rod” from the housing - incorrect adjustment can reduce the efficiency of the booster or cause incomplete “release of the brakes” of the working brake cylinders. This method of checking the amplifier is common among car enthusiasts - start the engine after squeezing the brake. When starting the engine, the pedal should go to the floor.
The process of removing the vacuum brake booster
If the booster is faulty, the brake pedal will remain “stiff”. In general, hissing associated with the operation of the vacuum brake booster is normal. But in the case when its volume increases for no apparent reason, get ready to replace the vacuum amplifier before it completely fails.
How to check the vacuum brake booster
The braking system of a car is constantly exposed to loads, and in the so-called aggressive style of driving on city streets, these loads increase exorbitantly. In general, influences of this kind are carried out constantly, even if you prefer a loyal level of speed.
Payment via WebMoney
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Downloading a book
After successfully completing the payment (by any method) and returning to the KrutilVertel store from the payment system website, you will be taken to the successful payment page:
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The book you purchased will be in your personal account, from where you can always download it.
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If for some reason you did not return back to the site and closed the payment system tab with a message about the successful completion of the payment, please let us know - we will send you a letter indicating access to download the book.
Auto-assistance
The brake system of Gazelle cars is two-circuit with a hydraulic drive. The first circuit includes the front disc brakes, and the rear circuit consists of two drum brakes and a brake force regulator (“sorcerer”). Malfunctions in the brake system can occur due to the poor quality of individual components and incorrect actions by the driver when performing repair work on the brake system.
One of the “diseases” of the Gazelle brakes is the activation of the brake drive from the second stroke. The culprit for this malfunction is the piston thrust rings located in the rear brake cylinders. Due to the poor quality of their manufacture, they lose their elasticity during the operation of the car, as a result of which the tension spring of the pads moves them together with the piston to the middle of the cylinder. In this case, the gap between the brake pads and the brake drum increases and one press of the brake pedal is not enough for the pads to press against the brake drum. Therefore, the driver has to press the brake pedal a second time.
If the brakes are activated only after several presses on the brake pedal, then this will indicate that the hydraulic drive is not sealed, and the place where the brake fluid flows from it is taken up by air. Before you start pumping the hydraulic drive, you need to find the location of the brake fluid leak and fix it. You need to start removing air from the system from the right rear brake cylinder, then the left rear, right front and end with the front left.
If you are not the first owner of a Gazelle car, and if air gets into the hydraulic drive, you cannot bleed it. Then pay attention to the front brake calipers. It is possible that when repairing the brake system, the calipers were swapped, installing the right instead of the left, and the left instead of the right. In this case, the valves with which air is removed will be located at the bottom and during bleeding, it will not be possible to remove air from the caliper. To eliminate this malfunction, you will have to rearrange the calipers so that the valves are located at the top.
The main brake cylinder can also be the culprit for brake system failure. You can check its correct functioning as follows. To identify its malfunction, you will need another person to press the brake pedal. And at this time, you must unscrew the cap of the nutrient reservoir, where the brake fluid is located, and see if it gushes out when you press the brake pedal. If so, the brake master cylinder will have to be replaced.
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The brake pedal fails and the brake fluid does not flow out. Looking for reasons - Auto Liquid
Sometimes it happens that the brake pedal becomes soft and pliable. The first and quite logical suspicion that a car owner has is a fluid leak. However, the reason for the ineffective operation of the braking system is not always its depressurization. What to do if the brake pedal fails and the brake fluid does not drain?
Air in the system
Perhaps the most common cause of brake pedal failure is the presence of air locks. Brake fluid is a completely incompressible medium. Air is easily compressed. And if gas plugs form in the brake system, then when you press the pedal they simply compress. And the force from the main brake cylinder is only partially transmitted to the calipers or working cylinders.
This phenomenon can be compared to an attempt to move a heavy object by acting on it not directly, but through a soft spring. The spring will compress up to a certain point, but the object will not move. It’s the same with an airy brake system: you press the pedal - the pads don’t move.
There are several reasons for this. The most common is old fluid that has not been changed for a long time. Brake fluid is hygroscopic, meaning it can accumulate moisture from the air. When the percentage of water in the liquid exceeds 3.5% of the total volume, it must be replaced. Because when you press the brake pedal, it can boil, which will lead to the formation of traffic jams.
The second reason is micropores in the brake force regulator, line joints or actuator units (calipers and cylinders). Contrary to popular belief, such pores in some cases are capable of sucking air from the environment, but not releasing brake fluid. Which leads to confusion.
The way out of this situation is simple: you need to replace the fluid if it is outdated, or bleed the system. Each individual car has its own method for bleeding the brakes. Basically, this procedure requires two people. The first one presses the pedal, the second one opens the fittings on the cylinders (calipers) one by one and releases the brake fluid, expelling gas plugs from the system. There are methods of pumping by gravity, in which a partner is not needed.
The master brake cylinder has failed
The main brake cylinder, if you remove the valve system and the division into circuits, operates on the principle of a conventional hydraulic drive. Almost like a syringe. We press on the rod - the piston pushes the liquid and supplies it under pressure into the system. If the piston cuffs are worn out, fluid will leak into the cavity behind it. And this will lead to a sinking pedal and almost no brakes. In this case, the liquid in the tank will remain in place.
There is only one way out of this situation: repair or replacement of the brake cylinder. Repairing this element of the system is now very rarely practiced and is not available for all cars. In addition, the repair kits from the cuff set do not always solve the problem. Sometimes the surface of the cylinder is damaged by corrosion, which eliminates the possibility of repair.
Critical wear of system parts
Another reason for a failing brake pedal may be critical wear of the pads, drums and discs. The fact is that calipers and brake cylinders have a limited piston stroke. And when the pads and cylinders wear out, the pistons have to move further and further to create contact pressure between the pad and the disc (drum). And this requires an ever-increasing volume of liquid.
