I’ve read and been told that this is a good idea. Andrew Major told me that people have damaged the master cylinder seals or bladder by not doing this. Interesting discussion about lubricating the pistons or not. Park tool have a video of this process where they do lubricate the pistons. I am thinking that what we want is pistons that have equal drag so that the react the same on both sides. I’ve wondered if a lazy piston is from one sticking or the other being too slick. Thinking about it, if you pump a piston out beyond the depth of the square seal and push it back in, that part of the piston is being bathed in fluid. I’ve always cleaned with a q tip dunked in brake fluid. Once the piston are pushed back in their bores I flush with lots of soapy water and run a rag or blue towel through.
March 13, 2021, 9:07 a.m. - Andy Eunson
I’ve read and been told that this is a good idea. Andrew Major told me that people have damaged the master cylinder seals or bladder by not doing this. Interesting discussion about lubricating the pistons or not. Park tool have a video of this process where they do lubricate the pistons. I am thinking that what we want is pistons that have equal drag so that the react the same on both sides. I’ve wondered if a lazy piston is from one sticking or the other being too slick. Thinking about it, if you pump a piston out beyond the depth of the square seal and push it back in, that part of the piston is being bathed in fluid. I’ve always cleaned with a q tip dunked in brake fluid. Once the piston are pushed back in their bores I flush with lots of soapy water and run a rag or blue towel through.