Vibration when braking at speed. Vibration of the brake pedal when braking

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The biggest trouble that can occur in the brake system of a car is vibration when braking. Because of this, in an extreme situation, the car may simply not stop at the right time, and an accident will occur. Professionals attribute this to the fact that in an emergency, the driver will be afraid of beating in the steering wheel and pedals and will weaken the force of pressing the brake. Worse than these problems can only be a completely inoperative brake system. There are several main reasons for this behavior of the car - the identified problems should be fixed immediately. Road safety depends on it.

How to detect vibrations?

Both the brake pedal and the steering wheel often knock - it is as if the anti-lock system intervened in the process of stopping. You can detect vibrations when braking on a dry and even surface.

It is best to test the car for vibrations on asph alt. Then ABS, if it is in the car, will not interfere with the process. It is necessary to accelerate to 80 km / h, and then abruptly, but without blocking the wheels, begin to slow down. If there is a characteristic vibration when braking, then you should think about repair.

Causes of vibrations on the brake pedal

This unpleasant phenomenon can occur for several reasons. In most cases, professionals note brake discs, brake drums. Less often (but also should not be ruled out), air is found in the lines of the brake system. Sometimes the reason is badly worn tires, wheels with imbalance. Crooked wheels are also the vibration of the steering wheel when braking. Rarely there are problems with the operation of the anti-lock system, however, this malfunction is easily diagnosed by the car's ECU. Among the reasons, worn parts will not be considered.

Brake pad corrosion

The car is made of metal, but metal corrodes. Even if the car is stored in a warm garage, you should not think that it does not rust. If the car has been standing for a long time, then corrosion appears in places where the pads come into contact with the discs. In this case, during the first attempts to brake, the vibration of the brake pedal during braking is clearly felt. Sometimes this effect goes away on its own. But most often the disc and pads have to be changed.

Poor pads

Besides corrosion, they may simply be of poor quality. Today, getting married is easy. BUTif the discs were not in very good condition, then the working layer on the block will wear out unevenly. On some pads, the friction lining crumbles in whole pieces. Vibration on the steering wheel during braking occurs as a result of a loose fit between the pads and the disc.

Changing the geometry of the brake disc

This is another reason that causes vibrations in the brake pedal and steering wheel. It consists in a sharp cooling of the disk. When the driver has an aggressive driving style and moves dynamically from one traffic light to another, the discs simply do not have time to cool down. But overheating can also occur during quiet driving due to the caliper, which cannot provide enough clearance between the pads and the disc.

If the car drives into a puddle, the brake disc cools sharply and bursts or deforms. After such deformations, it looks like a bicycle wheel with a “figure eight”. The problem is that visually these deviations on the disk may not be visible. If the latter is of poor quality, then overheating affects it very detrimentally. Deformations are provided for him, which means that vibration of the pedal during braking is simply inevitable.

Deformations in drum brakes

Drum brakes are practically indestructible, but sometimes troubles can happen with them. They, like disk ones, can overheat (but to a much lesser extent). Overheating occurs if, in a hurry, the driver forgets to release the car from the handbrake and at the same time travels a sufficiently long distance. Drivermay not even notice that the car is practically not moving. When stopping, the handbrake remains raised, or the handbrake twitches again.

From the school course of physics it is known that when heated, the metal tends to expand. As it cools, it shrinks. In the case of a drum brake, the pads will not allow the drum to return to its normal state. As a result, the geometry changes and takes the form of an ellipse. Hence the vibration of the brake pedal when braking. To ensure safety, the vehicle's braking system has two parallel or diagonal circuits. Drum brakes today can only be found on the rear axle of budget cars. However, if in a particular car engineers created a parallel circuit, then beating on the pedals will be felt. If it is diagonal, then the steering wheel vibrates when braking. You can identify a deformed or damaged drum by the gloss of the working area. It will be heterogeneous.

Brake cylinders

Rear and front cylinder may not work properly. Often these components of the brake system simply turn sour and then fail. This causes the pedal to vibrate when braking. Solving this problem is very simple - just spray WD-40 or a similar lubricant into these mechanisms (Mannol produces an analogue). But most often only replacement helps.

Hub as the cause of vibrations during braking

This is a very rare cause, but you shouldn't rule it out either. Often the hub is deformed only in an accident or with extremely strong impacts. Howeverwhen it hits a hole, the wheel will most likely come off the car or vibration will occur on the steering wheel just when driving. It will not be superfluous to check the wheel bearing. If its wear is observed, then it is the main reason for the appearance of beats. For diagnostics, you should jack up the car (hang out the wheel) and check its play - sway from side to side. Play should be minimal, and rotation should be without sounds and hum.

Proper brake system and pedal beats

If the brake system is in perfect working order, and the vibration when braking is still felt, and at the same time it is not possible to find defective elements in any way, then the problems are hidden in less obvious places.

In such situations, experts advise checking the wheel balance. The fact is that when unbalanced, centrifugal force acts on the wheel. She is the cause of all problems. An experienced driver can easily identify an unbalanced wheel. But in this case, the vibrations will be not only on the pedals, but throughout the body. You should also check the front suspension. Vibration in the brake pedal when braking can be a sign of deformed suspension arms or loose mountings.

It is recommended to carefully check the reliability of the fastening of the body, suspension and brake system. Service stations often find badly tightened bolts all over the car. This problem will be especially relevant if the car is often used on poor quality roads.

Brake Caliper

One morean infrequent reason why vibration occurs when braking is an uneven force on the caliper. As a result, it jams. But it is very difficult to identify this problem on your own - you need to visit a specialized service station.

Vibration when braking at speed

When the car is driving at high speed, parts of the brake system are subject to heat. It is possible that the disc and caliper get very hot, jam, and as a result, at speed when braking, vibration or even strong shaking.

Dangerous runouts: loose wheels

This is an easily fixable problem. Diagnosing it is also easy. It is for this reason that various vibrations and beats often occur. One or even all four wheels may be loose.

As simple as this reason is, it is very dangerous. If the problem is not detected in time, the consequences can be very terrible not only for the driver or his passengers, but also for other road users. Repair in this case, namely, if you do not notice the beats in time, can be very expensive. Hubs are broken, wheel discs are deformed, brake discs are deformed and the mounting holes on the disc are broken. If there is vibration during braking, it is better to once again make sure that all the bolts are tightened securely enough. But you shouldn't drag it to the characteristic squeak either.

What else causes beats and vibrations?

These reasons are rare, but still need to be considered. Sometimes meetminor problems in the steering rack or the ball joints of the vehicle's undercarriage are too worn.

Also, vibrations and beats will occur due to worn shock absorbers. But in this case, the effect will be felt at the moment of rotation. Also, beating in the brake system and steering wheel can be provoked by strong car impacts.

Can the problem be ignored?

If vibration occurs when braking (VAZ-2170 is no exception), then it is better to visit a service station without delay. But you can close your eyes to this problem for a certain time - some people drive like this throughout the year. However, if the reason lies in the weak tightening of the nuts on the wheel, then this is very dangerous. Such beating in the brake system puts a significant load on other parts in the chassis.

Also, vibrations at speed, as already noted, can provoke an accident - it is very easy to lose control of the car. Driving a car is dangerous in itself, and if such symptoms appear, it is better to find and eliminate the cause. Do not endanger yourself and passengers. Keep your cars in good condition - take care of yourself and your loved ones.