My passenger rear wheel started making a very high pitch noise intermittently when I hit the breaks. Thinking it was the pads I swapped them out. The old ones still had good meat on them.

All went great until this a.m. It's making that same high pitch squeal. If I let off the break and get back on it… it will sometimes go away… and it does not do it every time I hit the breaks. The rotors are not damaged. The caliper retracted fine when I switched the pads so I'm assuming the calipers fine... but I can't figure out why it's still making that noise. There weren’t any shims in it before and I didn't put any in now... could that be the cause? Could it be a wheel bearing? (But I don’t think it would only squeal when I hit the breaks if it were a wheel bearing).

Any help appreciated... I'm at a loss.

85 GSL.

 

You can try some disk brake quiet, its usually a blue color and you can find it at most auto places. You place some on the back of each pad so that they don't vibrate and screetch when lightly applied. Not sure about 85 rear disk brakes but most disk brakes have some form of anti squeal shims or springs to keep the pad from laying against the rotor which is usually the cause of the noise.

See the FSM for an 85. Trochoid on this forum has links in his signature to the scanned in FSM.

 

yea use the disc brake quiet stuff and use small amounts of grease on any metal to metal contact points. just make sure to keep the rotors and pads clean

 

Seized caliper assembly is my guess.
Was it hard to move the caliper when you changed the pads?

 

buy a set of brake shims, i've never had good luck with brake quiet