Grimeca Rear Brake Master - 1980 500S
Posted: 16 Nov 2016 20:07
Hello,
I am in the process of rebuilding a rear Grimeca master.
I replaced the o-ring (1st groove) and the U-cup (3rd groove, closest to spring) with the open/pressure side facing the spring.
My problem: after reassembling the master piston moves more or less freely and the spring pushes back the piston after manually compressing it.
After letting it sit for about 1h without moving it the piston appears to be stuck in the cylinder. I can hardly compress it anymore and need quite a bit of force to do so.
After being compressed the piston is stuck and the spring is not pushing it back.
Any idea what's wrong and how to fix it?
Thank you!
I am in the process of rebuilding a rear Grimeca master.
I replaced the o-ring (1st groove) and the U-cup (3rd groove, closest to spring) with the open/pressure side facing the spring.
My problem: after reassembling the master piston moves more or less freely and the spring pushes back the piston after manually compressing it.
After letting it sit for about 1h without moving it the piston appears to be stuck in the cylinder. I can hardly compress it anymore and need quite a bit of force to do so.
After being compressed the piston is stuck and the spring is not pushing it back.
Any idea what's wrong and how to fix it?
Thank you!