Why would your brakes make a terrible grinding noise?

Answer

Get it checked out by a competent garage. It could be pads that wore out and are cutting into the rotors, worn out shoes cutting into the drums, loose hardware occasionally getting stuck in the rear brakes, a dust sheild bent in and rubbing on the rotor.

Don't waste time in getting this checked out, this sounds like a safety hazard and could lead to more expensive repairs if not attended to, or worse, an accident. I guess technically it wouldn't be an "accident" anymore!

I would also get them to check your brake calipers. I had a similar incident with my car where the clips on the brake caliper had to be changed because they broke off.

Also be sure to get the mounting hardware checked out, specifically the caliper bolts/pins. If these are worn they will cause the calipers to twist during braking. One sign that this is happening is the pads are wearing on a taper (the front edge of the pad is thicker than the rear edge or vice versa). A new brake hardware kit will usually repair this, but the caliper itself may also have to be replaced.

A stuck caliper will also cause wear of the pads, but it is usually the inside pad that gets worn out very quickly, while the outside pad (closest to the wheel) may still look nearly new. You can repair this by replacing or rebuilding the caliper. For the money, it is generally better to replace the caliper.

Most likely, it is simply worn out pads (or shoes if you have drum brakes). If they are worn out to the point of making the noise I believe thet are making then you will probably need new rotors (or drums). I am not a fan of having rotors and drums turned personally. If too much is milled off of them, it can cause the piston(s) in the caliper to come out of their bore during hard braking, which will result in total braking failure of the caliper that the piston comes out of. The same principal applies to drum/wheel cylinders also. (Not a lot of fun)

I agree completely. Get your brakes checked out by a professional immediately. Nothing with your brakes is ever minor!!!

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