Need help! The 2000 Seville (with 34k miles) that I purchased a few months ago has developed a problem. When braking at slow speed, I can feel a vibration and also here it. I believe it is coming from the rear wheels, but I'm not sure. The problem is very intermittent. It will go away and not come back for days and only appears at low speed.

Removed the rear wheels yesterday to check and see if the calipher was floating on the mounting pins, but they did seem to be lubricated and they were loose.

The car was inspected after purchase and the brakes were good - 7/32. Suspect the problem could be a low brake warning, but this car has an electronic pickup and is not throwing any codes.

One question I have is the calipher locating pins only had one 12 mm nut and the other did not have anything. How are these caliphers mounted? Do you removed the one and then pivot the calipher up and slide it off the other pin?

Any help would be appreciated.

Does it feel like anti-lock brakes activating?

One question I have is the calipher locating pins only had one 12 mm nut and the other did not have anything. How are these caliphers mounted? Do you removed the one and then pivot the calipher up and slide it off the other pin?

Any help would be appreciated.
Yup, you got it.

Does it feel like anti-lock brakes activating?

No, I don't think it has anything to do with the anti-lock brakes. It feels like it is only coming from one wheel and even after stopping, upon pulling out and hitting the brake the rubbing sound and vibration is still there. But it will come and go randomly.

As I said before, at high speed the brakes are normal and no sounds or vibrations are felt.

Thanks,

Joe

Might have a pad that is just starting to go metal to metal.

I've seen where a large piece of the brake pad material has fractured and separated from the metal backing, yet it remains in-place (and sometimes not). The fractured pad does not become visually obvious until you disassemble the caliper for pad-replacement and the piece simply falls off in your hand. I've witnessed this several times in the last 10 years on my own cars, and I suspect it's because of the modern materials (ceramics?) used for pad manufacture.

At 34K miles, your brakes (the rears anyway) are probably the originals, so since you have to disassemble the caliper to fully check for a failed pad, then you might as well slap new pads in there when you put it back together. Of course, you should also verify that the rotors are not scored, and resurface or replace them if so.

By the way... 7/32 inch of pad isn't much at all. New pads are a good half-inch thick. You need pads! You better recheck your front too because front pads wear faster than rears.

My thoughts on this are that its posible your back rotor is warped. and may need to be turned or replaced.