Rebuilt MC, Now Big Problem
Thread Starter
Burning Brakes
Joined: Dec 2005
Posts: 1,164
Likes: 224
From: Pawleys Island, SC
Whatever the issue was, it's gone. Reinstalled the rebuild kit, took it for a test drive. Brake warning light was on when I first started it but went out with a couple of pumps on the brake. Leak seems to be fixed (the reason I rebuilt the MC in the first place). Brakes are working perfectly. Thrashed it a bit, hard pedal, sure stops, easily lock up those 'big' 255-60s. Happy that it's fixed but not so happy that I don't know what the problem was. Stuck proportioning valve, trapped air, flipped piston lip seal, no idea.
Thanks to everyone that contributed ideas.
Thanks to everyone that contributed ideas.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
I agree about the Lip Seal style. I do know that the "O" Ring style will flip itself over and damage itself on the return stroke of the brake pedal. Hence, on the box of a new MC is a bright red label stating: Do Not Force Piston Into Bore, More Than 1 3/8" or you will void the warranty.
Thread Starter
Burning Brakes
Joined: Dec 2005
Posts: 1,164
Likes: 224
From: Pawleys Island, SC
