hi, my car's break had squeaky sound since 3000 miles. Right now, the car is 5000 miles and I can't stand it anymore because it's more often.(BTW, I dont have the brembo break) I brought it to the dealer today and ask them to fix it. At first, they said that the sounds might come from the ABS and it's normal, but they would check it and see what's wrong with it. After couple hours, I went back and pick up my car. They said the break pad was glazed and they changed the whole thing. Now the sound is gone, but I am worried that it will come again after couple thousand miles, Am I too paranoid or what?

yu miao

 

Here are the more common reasons and solutions to cure the infamous Brake Squeal....

Discs must be smooth, clean and flat to provide optimum braking. If the brake disc is rough, warped, scored or glazed the pads are going to vibrate or chatter every time you apply the brakes. If the brake discs are to thin the brake system will operate at a higher temperature resulting in glazed pads. For every 1mm taken of a disc it adds between 80-100 degrees to the operating temperature of the brake system.

Another form of brake squeal is caused by the Brake Pad vibrating when brake pressure is applied. Heavy braking usually stops the squeal because the extra pressure dampens the vibration. If heavy braking does not stop the squealing it is a sign of a significant problem (like possibly worn out pads). Squealing that appears under light braking is not a safety concern; it is just very annoying.

When this type of squealing occurs it is usually the leading edge of the Brake Pad that is in contact with the rotor causing a twisting force on the pad making the trailing edge want to lift away from the disc.

One option to help reduce the Brake Pad squeal is to fit Brake Pad vibration damper pads. The vibration dampers are a self-stick fibre material shim that sticks to the back of the brake pad. Some Brake Pads have a spring at the back of the backing plate located in the middle of the pad. The spring fits tightly into the piston with the fibre shim sticking to the back of the brake pad. The theory is that the fibre shim will help cushioning the vibration of the brake pad.

A second option is to coat the back of the Brake Pad with a quality anti-squeal compound. This is applied to the back of the brake pad. It is said that a combination of vibration dampers and a coating of anti-squeal compound usually reduces low speed squeal.

Some types of caliper designs are more apt to be noisy than others. The pads in these calipers may not be held as tightly and/or the caliper itself may move around a lot when the brakes are applied. The greater the play in the system, the greater the tendency to make noise.

That’s why some new car dealers try to dismiss the problem by telling their customers some noise is "normal" — leaving the customer no alternative but to live with the problem or to get it fixed by somebody else.



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