[Healeys] BJ8 Brake booster fail locks brakes on

[David Nock]

Large vacuum piston is sticking in the tank. This is a common problem  
when rebuilding the original style servos.
The rubber seal the goes under the leather seal is installed with the  
flat side in towards the piston.

Also make sure the inside of the vacuum tank is very clean and then  
you can spray it with a dry lube.


David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767

www.britishcarspecialists.com
.
.

On May 23, 2012, at 3:18 AM, Chris Dimmock wrote:

> 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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