Do I need brake cylinder paste when replacing plugs under reservoir? - Page 2 - PeachParts Mercedes-Benz Forum

funola · #16 08-03-2014, 03:13 PM

Quote:

Originally Posted by uberwasser

If Silicone works, I have a whole tub of Silicone grease. I'm not sure it would - haven't read anything one way or another about it. I did read that the brake cylinder paste being discussed here is not to be used with DOT5 silicone fluid, however, so that makes me hesitant to use silicone grease/paste with non-silicone fluid.

I think for this particular application I'll stick with brake fluid and then continue to research. Rust isn't much of any issue around here - besides the two or three months of monsoon where humidity might be around 40%, we tend to stay in the 10% range.

According to this EPDM Chemical Compatibility Results EPDM compatibility to Silicone is excellent. If you use it to lube just the gasket (between gasket and master cyl only) and not put any of it in the reservoir, I doubt any will get into the brake fluid.

uberwasser · #17 08-03-2014, 11:00 PM

Thanks. Didn't see your post before diving in to the work. For this application, I just coated them with brake fluid. Next time I'll plan to try silicone grease.

Work is done - new seals between reservoir and master cylinder and new seals over the sensor floats. Also, new rear lines (fronts were fairly new and still good). Brakes bled and all is well. No leaks with 10psi of pressure applied from the bleeder - that's what started this whole adventure, leaks from the sensor seals during pressure bleeding and then noticing the poor shape the reservoir plugs were in.