Sticking brakes 70 GTV

[Brett Daniels <Brett.Daniels@domain.elided>]

I have just about got my GTV mobile again but am having a problem 
with the brakes (single circuit, standing pedals). I have fitted a 
new master cylinder and was able to bleed the brakes fine and all 
wheels seemed to braking fine with the engine off. So, after bleeding 
the new clutch I fired it up and set out for a test drive. Three feet 
later I pushed the brake pedal and it felt like a rock and the car 
stopped with some alacrity. However the pedal then appeared to be 
stuck and the car would not budge when I tried to drive off. I 
switched the engine off and opened the bonnet, noticing on the way 
around that the brake lights were still on. I guessed that the system 
was somehow not releasing pressure, so I loosened the output pipe 
from the booster which released the brakes and i was able to reverse 
back into the garage. I then removed the vacuum hose from the booster 
started up again and the brakes worked OK although they will need 
bleeding again. So, I think that the booster is somehow locking on 
all four brakes (and the brake lights when I don't think would stay 
on if it were a sticking caliper). I have never serviced a booster 
before and was hoping someone might have an idea which part of the 
booster might be causing problems and how this might be repaired. I 
have also thought about bypassing the booster which might be a 
temporary solution if a definitive one is difficult.

By the way, my car (1970 Australian delivery) also has a Hellebore 
steering wheel with horn buttons in the spokes.

Thanks

Brett Daniels
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