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Robert Noel Reddington
Grand Master
Username: bob_uk

Post Number: 418
Registered: 5-2015
Posted on Friday, 14 August, 2015 - 06:57:   Edit PostDelete PostView Post/Check IP

For 50 years I have been using copper slip on the backs of brake pads and brake pad fittings. Also as an anti sieze for general use. Its almost as good as anti seize grease.

A BMW tech guy told me that copper grease is mineral based and can migrate to the main caliper seal. BMW do not use copper slip. They use a sachet of special grease which does 4 calipers and costs 50 pence.

Another way of stopping squeal is red hermitite, halomar, silicon sealer, or a piece of thin leather. The squeal is caused by resonance. Anything between the pad and piston damps the squeal.

I have never ever had trouble with copper slip and caliper seals. But I don't ladle the stuff on the pads just a smear.

I checked this on the interweb and some have confirmed this. But one said that copper slip in brgs will quickly destroy the brg. This is not true because I have used copper slip on brgs and nothing happened. I used it on a winch gearbox. Not suitable for plastic brgs and gears.

Use a smear of petroleum jelly on fixing inside the car as you screw the inside together. Petroleum jelly doesn't leave stains and a quick wipe and its gone.
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Jan Forrest
Grand Master
Username: got_one

Post Number: 852
Registered: 1-2008
Posted on Friday, 14 August, 2015 - 22:21:   Edit PostDelete PostView Post/Check IP

IIRC the the advice is to not use copper based greases in roller bearings as it promotes slip between the rollers and the races. Once this starts it doesn't know when to stop and the rollers can soon develop a flat face or two so that they no longer roll. Ball bearings are less prone to slip and should be OK.
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Robert Noel Reddington
Grand Master
Username: bob_uk

Post Number: 422
Registered: 5-2015
Posted on Saturday, 15 August, 2015 - 05:42:   Edit PostDelete PostView Post/Check IP

I shall remember that about roller bearings. I don't make a habit of stuffing races with copper slip I use Castrol LM grease lovely stuff.