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Brake Assembly Rubber Grease

Brake Assembly Rubber Grease

A little advice is needed regarding bleeding a dry brake system on my 120. After rebuilding all the wheel cylinders, because they were all frozen, I went to try to bleed the system. The problem is that since it is a new master cylinder, the seals are too tight to let the piston return under its own force to the position where the tilt valve will open. Because I can't fill the master cylinder, I can't get any fluid into the system. I've tried to use a vacuum to draw the fluid from the master out through the bleed nipples. But I was unable to get anything. Any ideas as what to do? - Aaron Pincus

Aaron, Whenever I assemble a master cylinder or a wheel cylinder,I lightly coat the bore and the rubber seals, with what I believe to be a silicone grease. I have a small squeeze tube which I bought 10 years ago at a foreign auto parts store. On the tube it says: genuine Castrol Girling Rubber Grease ,specially prepared by Castrol for Girling, made in England, This grease is specially prepaired for use with all Girling Hydraulic Brake clyinders and may be used safely without harmful effect on natural rubber seals or dust covers, Never allow ordinary grease to contact any part of the hydraulic system. I use this rubber grease on systems that I intend to use silicone or DOT4. I have never had any harmful effects from its use. Perhaps if yourmaster cylinder was lubed it would not stick and the return spring coulddo its job. Regarding, any new old stock or shelf aged brake replacement part, I would recommend disassembly and inspection before installation. - Regards, Wray Schelin

If you have any questions or comments send e-mail to: ted@jag-lovers.org
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