For the auto repair minded. What could cause a brake pad/assembly to get super hot? Has melted two hubcaps.

A sticking or dragging caliper will not allow the brake pad to disengage from the surface of the brake rotor. Not only does this cause excessive premature brake pad and rotor wear, but the vehicle will be literally driving with the brakes slightly applied all the time. A telltale sign of a severely sticking caliper piston is the vehicle pulling to one side when driving. If you constantly have to hold the steering wheel in place, it may not have anything to do with steering or wheel alignment. One of the causes I have seen is that the black hose leading to the calipers is collapsed on the inside. It will act like a one way valve, this will not release the pressure when you release the brake, but the greater hydraulic pressure when you step on the brake will go through to the caliper. This built up pressure will be like driving with your brakes on causing heat build up in that wheel. If you continue driving the car like this it could even lead to transmission failure. One way to check for this is lift the vehicle with a floor jack and secure it on jack stands. Try spinning the wheel. Now open the bleeder and release the pressure then close it. If the wheel turns freely you have a collapsed line. If not it is most likely the caliper itself that is sticking.

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Thank you much!
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by Andrew on October 11th, 2009

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For the auto repair minded. What could cause a brake pad/assembly to get super hot? Has melted two hubcaps.

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