[Healeys] BJ8 front brake lockup

Michael Salter michaelsalter at gmail.com
Thu Jun 4 12:12:13 MDT 2015


No proportioning valve in a Healey..Unless yours is a Mk IV 3000.

Michael S
BN1 #174

On Thu, Jun 4, 2015 at 1:17 PM, Tom <ah3000me at gmail.com> wrote:

> 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
>>
>>
>>
>>
>


-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
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