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What is the reason for brake shake when driving at high speed?
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What is the reason for brake shake when driving at high speed?

What is the reason for brake shake when driving at high speed?

February 11, 2026

In the afternoon, a car owner walked into the store and asked the driver, 'When you step on the brake while driving at high speed, the car will shake noticeably. What could be the problem?


After listening to the car owner's question, the driver conducted a road test and found that the problem was indeed the same as described. However, the driver has confirmed where the problem lies, which is caused by uneven brake discs.



The car owner asked if the brake disc is uneven and needs to be replaced? The master said that boring the disc is enough, just polish the surface of the brake disc and remove the uneven layer.

After the car owner agreed, the master began to dismantle it. As shown in the picture below, the wheels have been removed and the complete brake disc can be seen. The master said that although the surface looks flat, it is actually not flat anymore.

Also check the brake pads, they are quite thick.

The brake disc is relatively easy to disassemble, and the master removed it in less than five minutes.

You can see the signal wheel hub and wheel speed sensor inside the bearing

The brake disc has been fixed on the boring machine and will rotate with the fixed shaft. The adjacent blade will scrape off a layer of the brake disc surface.

The brake disc has been completely bored and is very flat.

The outer side of the brake disc needs to be bored, and the inner side also needs to be bored.

The left brake disc also needs to be bored, as shown in the figure below. The left brake disc has been removed.

The brake disc has been installed in place, just install the wheels.

Finally, the driver conducted a road test and found that there was no shaking when applying the brakes during high-speed driving. If we car owners encounter this typical situation of brake shaking, it is highly likely that it is a problem with the brake disc, which can be solved by boring the disc. If the brake disc is too thin, it needs to be replaced with a new one.

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