[Russg]

imported post

I'm trying to bleed/service the rear brake. I read about a check valve
at the top of the master cylinder piston chamber, but when I take my
master cylinder apart, there is no check valve present.
The symptoms seem to be that there needs to be a check valve.
I try to bleed the system and it won't pump up, just keeps pumping
and never gets any pedal resistance.
What could have happened to the check valve and where can I get one?
I've checked eBay, and bought a used rear master cylinder, but same
problem. The rebuild kits I see on eBay don't have the check valve,
just the spring, primary and secondary cups, circlip, metal piston and
rubber dust cover.

 

[churchhillmike]

imported post

Hi Russg,
Just looked at the schematic for the rear brake master cylinder for your bike. There isn' a check valve listed there. That;s according to Honda.
Mabye you just need the rebuild kit that they have, if they still stock it that is. your cups are probably worn.

 

[Russg]

imported post

Hello.
It (the used master cylinder) works....
I was just expecting more pedal, less play. I could
adjust the pump bolt. I still don't know what was
wrong with my other cylinder, or if I just didn't
do a good bleed.

 

[Russg]

imported post

Thanks Mike.
I may sell the old master, but say it needs a rebuild
kit (I see the kits on eBay for about $40). I have plenty
of rear brake now. That's good news that there isn't
a check valve. My Honda manual actually shows a check
valve, but it is a '75 manual. Now I have to do the
front brakes.