Post by tg4360 on Jun 3, 2008 21:01:58 GMT -5
So I'm cleaning up the '80 SR that my buddy and I just got and the master cylinder was frozen so no front brake.
My buddy was talking to the local parts guy and he said that the original master cylinder was made of all plastic and not worth rebuilding. I’d noticed that the one on the bike didn’t look like the one on a parts web site that had a Yamaha type diagram. I think it’s been replaced with a metal one.
It was locked up so I took it off and all the hoses and the caliper. The small orifice that lets air out ahead of the piston was totally blocked so my buddy told me he had the same problem on a Honda he just sold and that he just drilled it out with a drill bit that looked to be about a 64th.
Then one of the hoses was blocked up so he comes to the rescue again by telling me to boil the hose on the stove for a few minutes and then blow it out. I hooked it up to the master cylinder and after squeezing a few times, out popped some grungy looking fluid and it’s open now.
I’d never have thought to boil them but he says it breaks up the old hard fluid.
Just thought I’d pass the knowledge along.
My buddy was talking to the local parts guy and he said that the original master cylinder was made of all plastic and not worth rebuilding. I’d noticed that the one on the bike didn’t look like the one on a parts web site that had a Yamaha type diagram. I think it’s been replaced with a metal one.
It was locked up so I took it off and all the hoses and the caliper. The small orifice that lets air out ahead of the piston was totally blocked so my buddy told me he had the same problem on a Honda he just sold and that he just drilled it out with a drill bit that looked to be about a 64th.
Then one of the hoses was blocked up so he comes to the rescue again by telling me to boil the hose on the stove for a few minutes and then blow it out. I hooked it up to the master cylinder and after squeezing a few times, out popped some grungy looking fluid and it’s open now.
I’d never have thought to boil them but he says it breaks up the old hard fluid.
Just thought I’d pass the knowledge along.
