Mjk
XS400 Member
While putting the finishing touches on what I consider a nice 1978 XS400 build, the front brake began giving me trouble and the piston is now firmly seized in the caliper assembly. The master cylinder is not the proximate issue (new HEL hoses and master cylinder rebuild kit), the piston is just stuck as could be by what appears to be a lot of rust.
Attempts to free the cylinder with vinegar, CLR, and light tapping/pulling with hand tools have been unsuccessful. Oddly enough though, in attempting to bleed the brakes to force it out, not much pressure built up in the system at all, even with what appeared to be all of the air out of the system, so something else MAY be at play.
I am at my wits end as to how to solve this seized piston problem. Any ideas, tips, tricks, or caliper assemblies for sale (that fit) will be tried to get the bike rolling again Thanks!
Attempts to free the cylinder with vinegar, CLR, and light tapping/pulling with hand tools have been unsuccessful. Oddly enough though, in attempting to bleed the brakes to force it out, not much pressure built up in the system at all, even with what appeared to be all of the air out of the system, so something else MAY be at play.
I am at my wits end as to how to solve this seized piston problem. Any ideas, tips, tricks, or caliper assemblies for sale (that fit) will be tried to get the bike rolling again Thanks!