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MG MGB Technical - Load Brake Squeel Passenger Side

I just got finished rebuilding my brake master cylinder and put on new brake pads. The passenger side caliper was sticking. So I took the caliper all apart and rebuilt it. I am getting a loud squel from the passenger side front brakes when after driving it for a bit. What causes this??

Thanks
matt kaser

The squeal is caused by a high pitch vibration being set up in the pads when braking. To eliminate it coat the rear of the pad with Copaslip grease or perhaps as well put a diagonal cut in the friction material across the pads
Iain MacKintosh

Is there a US version? Can I just use standard Grease or anti seaze?

Thanks
matt kaser

No you can't use standard grease as this would contaminate the pad. It will have to be copaslip which is anti seize and looks like it is filled with copper filings.
Iain MacKintosh

Also, check that you have the cut_outs in the pistons correctly oriented towards the hub. I've found that if they aren't correct then the brakes tend to squeal.
Miles Banister

Most NAPA stores carry a product called Anti-Squeal in a spray can. It's messy, but effective, in shutting up noisy brakes. RAY
rjm RAY

Try CRC DISC BRAKE QUIET available at most Auto Part Stores. Spread a thin layer on the back of the pad contact with the piston. I have been using it for many years now, and recently when I replaced the pads on my 69 GT.

Hart
Hartley Mayers

There is special brake grease, I can't see any difference between copper grease and standard grease, both will contaminate the pads if it gets onto the friction material, as presumably will brake grease. I put a smear on every *metal to metal* contact point between pads, calipers and springs, including shims if fitted. It's very much a lottery, you can get it with grease, shims *and* rubber gloop on the back of the pads, but sometimes not even when none of those are present. After a rear brake squeal for some time, which repeated removal, cleaning and greasing only solved for a while, I simply swapped the shoes between sides and it has been fine since. So at the least just try swapping the pads over, the conditions *will* be different both sides. But of course it could make it worse ...
PaulH Solihull

I had an '89 MB 5OOSL come in for a brake job a few years ago. I replaced the pads and rotors on all 4 wheels. They squealed like crazy. Even Anti-Squeal didn't work. Then I discovered a product, made by 3M, that consists of 3" discs that you mount in a drill to remove the lateral runout of the discs. After lightly treating each disc, the noise was completely gone. Apparently, many discs come from the factory with very small grooves on their surface that cause the pads to move back and forth causing the oscillation between pad and piston that makes the noise. RAY
rjm RAY

This thread was discussed between 17/07/2010 and 20/07/2010

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