G'day Christopher
Yes had the same experience with a Mk2 Jaguar that used to be our everyday
car. Yes it locked solid on Pennant Hills Road in the middle of peak hour. I
was later told that that the booster was the same as a BJ8. I didn't know of
course as you would realise I'm from the era when real Austin-Healeys didn't
have brake boosters. ;)
Took it to a few so-called Jaguar experts, but most were just that -
'sperts'. In the end took it to Better Brakes in Parramatta who said that it
was a dooverhicky inside that wasn't letting the fluid return. I took that
as technical talk for valve. Anyway first of all they actually found the
booster in the car which is tucked away upside down and underneath the right
hand side innerguard and then rebuilt it.
Worked like a charm after that.
Now Christopher as you have experienced a spanner wielding moment with your
Austin-Healey it seems to me that you should have taken photos of what you
have done and we can prepare an article for Flat Clat. What say you?
Hoo Roo
Patrick Quinn
Sydney, Australia
-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at
autox.team.net]
On Behalf Of Chris Dimmock
Sent: Wednesday, 23 May 2012 8:19 PM
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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