[tlchaffin]

I am rebuilding the brakes on my '68 w/ power disks. The proportioning valve has a narrow groove around it near the center. There was some kind of "O" ring in it but it broke apart. Is this a big problem? Can it be replaced? I know what the proportioning valve does but not the details of how it works.
Thanks,
Tom

 

[Cougar Bill]

Just use a o-ring. The is a vent/dirt seal

 

[tlchaffin]

Thanks, Bill. That is what I was hoping to hear.
Merry Christmas,
Tom