[Healeys] BJ8 front brake lockup

Tom ah3000me at gmail.com
Thu Jun 4 13:08:41 MDT 2015


Michael,

No such luck with the Mark IV...  :-)

So, that's just a simple union?

- Tom

On Thu, Jun 4, 2015 at 2:12 PM, Michael Salter <michaelsalter at gmail.com>
wrote:

> 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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