Causes of vibration when braking

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About the causes of vibration when braking a car tells MK Kashiyama Corp.

The vibration of the brake pedal and the beating of the steering wheel may occur even on a new car, and this unpleasant phenomenon is usually the stronger than the speed of movement. Below we will look at the possible causes of vibration in more detail, as well as tell about the ways to eliminate it.

1

Disk deformation under the influence of high temperatures

Under the influence of high temperature, the disk is deformed, which causes vibration. This is particularly often occurring with ventilated types, which have special air channels for passing air flows, and therefore, in contrast to discs of a non-ventilated type, not made of solid monolithic material. With such disks there are no problems under normal operating conditions, but the problem may occur when heated to a high temperature when a thermal expansion appears. It is possible to identify the deformation when viewing the surface of the disc — it occurs in it the thermofreaming of blue, while the edge of the disk is curved.

2

Non-uniform wear of brake discs

If the brake disc is installed incorrectly and vibration occurs during its rotation, the disc is bent unevenly, as a result there may be beating when braking. Uneven abrasion can be checked by measuring the thickness of the disk by the micrometer.

Measurements

Measurements are carried out by placing the arrow of the indicator at a distance of 10 mm inside from the outer circle of the disk. Rotate the rotor hand. If the value goes beyond the minimum allowable thickness, the disk is replaced. Together with the disk, replace the pads.

3

Rust on brake disc surface

In cold regions and areas with abundant snowfall, the surface of the disk due to the melting of snow can be covered with rust, which also causes vibration when braking.

4

Damage, crack in disk

During riding on the roads, disk deformation cases are often frequent. And it is enough to call at the velocity in the pit or drive in irregularity so that the disk is deformed.

5

Damage to the shock absorber

For example, in cold regions, when exposed to low night temperatures, the shock absorber can freeze, and if the car is in such a state for a long time, the oil seal of the shock absorber may be damaged, which will lead to oil leakage and cause vibration when braking.

6

Other reasons

• Wheel bolts are tightened with different effort

• Incorrect wheel balancing

• Hub Bearing Malfunction

• Weakening Caliper Fastening Bolts

• Excessive air pressure

• Uneven tire wear