[Healeys] BJ8 front brake lockup

[Tom]

The PO converted to DOT5 (Silicone) about 10 years ago.  The shop replaced
the master brake cylinder, all the flex hoses, the rear wheel cylinders,
the servo (I think), and flushed the whole system before adding DOT5.  I
replaced the front calipers about two years ago.

I agree, it would be unusual to have both front flex hoses go bad at the
same time.

Is it possible that the proportioning valve is bad?   I'm puzzled why the
rear brakes are fine and the front brakes are locking.  Or is that just a
red herring?

- Tom



On Thu, Jun 4, 2015 at 9:44 AM, Michael <michael.salter at gmail.com> wrote:

> Yes Tom,
> Old flex hoses although, unusual to have both fronts go bad at the same
> time.
> Michael S
> BN1 #174
> ------------------------------
> From: Tom <ah3000me at gmail.com>
> Sent: ‎4/‎06/‎2015 9:42 a.m.
> To: Healey Mail List <healeys at autox.team.net>
> Subject: [Healeys] BJ8 front brake lockup
>
> Hello all,
>
> I've had a bit of problem with the brakes locking this season.  After it
> happened the second time, I pulled the vacuum line form the servo and
> plugged it.  I put a few hundred miles on the car with the vacuum line off
> the servo, and the brakes have worked great.
>
> This morning, I backed out the driveway, and I noticed the car wouldn't
> roll downhill.  I pulled it back into the garage, and jacked it up to see
> where the wheels were locking.
>
> The rear wheels turned freely, slight drag on the right rear.
>
> By hand, the front wheels would not turn at all.  Neither one.
>
> Does unplugging vacuum from the servo completely remove the servo from the
> equation?  Could a servo without vacuum still cause locking problems?   I
> believe my servo is a Lockheed unit, put on by the PO, and the servo
> doesn't look that old.
>
> The front calipers are recent rebuilds (2 years ago).   Anything else that
> could cause the front brakes to lock up?
>
> thanks!
>
> Tom
>
>
>
>
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