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September 29th, 2008

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Q & A: MGB Faulty Brakes

Monday December 22nd, 2008
Q & A, MGA, MGB, MGC, MG T-Type, Midget
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.
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, they're faulty. If the rear... read more