RAWDAWGS -
I had some time to think about this, and I think I know what it is.
The brake booster rebuild kits usually come with a rubber seal for the
vacuum piston that is too thick. You have to cut these seals in half,
otherwise it can lock the brakes in the on position. The way you can check
it (sometimes) is when the brakes lock up, if you tap the vacuum cylinder
with a screwdriver handle or small rubber mallot (VERY GENTLY! You don't
want to dent the vacuum chamber!) and the brakes come loose, this is your
problem.
Only way to fix this is to take the thing out, pull out the vacuum piston,
pull off the rubber seal (located under the leather seal) and cut it in
half. To be honest, you almost don't need this seal - it works best when it
has very light pressure on the leather seal.
When I rebuilt the old booster on my BJ8 several years ago, I had to cut it
down twice (first I cut it only 1/4 off the seal and it still stuck -
finally cutting it in half worked).
Alan
'52 A90
'53 BN1
'64 BJ8
On Mon, Sep 15, 2008 at 4:01 AM, <RAWDAWGS@aol.com> wrote:
> I have a buddy who just rebuilt his Dad's Healey's brakes. He did
> everything
> brand new and is using silicon brake fluid. Anyway he drove it around the
> block a couple of times and it was fine, but when his Dad drove it the
> brakes
> would lock up and stay locked. He think he has traced the problem to the
> rebuilt power assist booster. I have a BN4 w/o a booster so I'm no help.
> Any ideas?
>
>
>
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