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Q & A: Faulty Brakes

Wednesday December 12th, 2007
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Dear John,


I am renewing my brakes on my 1969 MGB Roadster MarkII , which I have owned since new.
I sent the the brake master cylinder to White Post restorations for rebuilding and when returned , I installed the unit bled the brakes , but would not hold pressure. I sent it back, they renewed again. I installed again. Still no luck. I bought a completely new master brake cylinder from Victoria British, installed it. Same problem , brake pedal goes to floor, ( will not hold pressure?). The only thing that is left to be renewed is pressure valve assembly. this is the dual line system. the pressure valve assembly looks like a brake line union mounted to the inside front fender.

Could this be not functioning properly and therefore not holding pressure, i.e.. firm pedal feel. I bled the brake lines as the MGB shop manual describes, so I do not think it is air in the brake lines. And I have NO leaks of brake fluid.


Thanking you for your reply to my question.


Help!

Best regards Barry
Dear Barry,

I cannot believe that two master cylinders are faulty, so the
question is: What's wrong with the brakes.

Let me go through some of the common faults:

If the rear cylinders leak, ... read more