Many car owners have surely experienced brake pedal vibrating when the brakes are applied. Some cases are "incidental" and disappear within a few days. Some persist, affecting driving comfort and driving safety.
One of the causes of brake vibration
One of the causes of brake vibration is the presence of deep or shallow grooves on the surface of the brake disc. These grooves are caused by friction between the brake pad and the brake disc. How to solve this problem? The usual practice is to replace the brake disc. In order to reduce vehicle maintenance costs, some repair shops use the machine tool to polish the brake discs as an alternative. This method can also be employed if the brake discs are not worn out.
Why does the brake disc vibrate？
Some brake vibrations occur after the brake pads have been replaced. If only the brake pads are replaced, the new brake pads with a flat surface will not properly fit the old brake discs that have many grooves on the surface. When the brakes are applied, the grooves on the surface of the brake discs result in poor braking performance, and vibrations may occur.
Therefore, a period of running-in is required to make the surface pattern of the new brake pad and the old brake disc fit, so that the contact area gradually becomes larger to achieve the optimal braking effect, and the brake vibration may disappear. Replacing the brake discs together with the brake pads,or using the machine tool to polish the surface of the brake discs can reduce the chance of brake vibration.
When does the brake disc need to be replaced？
In the brake system, the brake disc can be said to have the longest replacement cycle.How long the brake disc can last depends mainly on the driving conditions and driving habits.
The brake disc does not have a wear indication function, and need for replacement can only be evaluated by measuring the depth of the grooves on the surface. When the total depth of wear on both sides of the brake disc reaches minimum, it is recommended to replace the brake disc in a timely fashion. Based on experience, it is usually necessary to replace the brake disc once after replacing the brake pads twice.
How to perform brake disc repair？
Brake disc repair usually involves using the machine tool to polish or finish the brake discs, and also uses the special disc repair lathe. Both have similar repair process and effect.
The brake disc repair method can be adopted for the brake disc whose degree of wear has not met the replacement criteria. This method is more cost-effective especially for some high-end brand vehicles, for which the brake disc costs more than one thousand yuan.
However, it is necessary to choose a repair factory with reliable repair quality to repair the brake disc. Instead of solving the brake vibration, a repair factory with sub-par technology may cause new problems after repairing the brake disc. This is because the brake disc is not properly installed during the repair, which results in inconsistent surface thickness of the brake disc after polishing.
How to drive after brake disc repair？
The surface of the brake disc after repair is relatively smooth, so that the braking performance will be poor for a short period of time, but will gradually return to normal after a period of running-in. Wear marks on the surface of the brake disc are normal, so there is no need to deal with them as long as no other problems such as vibration occur. If you are concerned about the braking performance after polishing, it is recommended to go for replacement of the brake disc.
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