Chris -
The rubber seal used under the leather seal of the vaccum piston needs to be
cut in about half. The leather seal only needs a slight amount of pressure
from the rubber to work properly.
Many kits use a rubber seal that's either too firm or too big, and it causes
the piston and the can to lock shut.
Very common problem for years.
Hope that helps.
Alan
Sent from my BlackBerry. smartphone
www.blackberry.com
-----Original Message-----
From: Chris Dimmock <austin.healey at gmail.com>
To: <healeys at autox.team.net>
Subject: [Healeys] BJ8 Brake booster fail locks brakes on
Hey guys,
Ever had a BJ8 brake booster fail so it locks your brakes on?
My brake booster (BJ8 std type) effectively pushed the pedal high, and locked
all the brakes on. Solid
Pushing hard on the pedal released the brakes, but next time you touched them,
same thing. 4 wheels locked solid.
This isn't a diagnosis question. I had replaced calipers, hoses, rebuilt wheel
cylinders, rebuilt the brake master cyl, replaced the reseviour with a new
one, and fitted a rebuilt BJ8 Booster. fitted new linings and shoes. And a New
one way valve in the booster vacuum line.
Thats when the problem started...
So I re rebuilt master cylinder. Twice. Checked and double checked everyting
Checked the booster one way valve.
Glimmer of hope was disconnecting the "new" booster. Problem vanished - but no
booster.
Today I put my old booster back on. Std BJ8, rebuilt 14 years ago. Brakes are
now perfect again.
This preventative maintenance has hairs all over it....
So the question is.... What's wrong with my newly rebuilt BJ8 booster that it
doesn't release the vacuum????
Ideas? Your experiences??
Thanks in advance.
Best
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