[Healeys] Brake issue

[Michael Oritt]

Michael

I was considering jacking up the car and releasing pressure at the wheels
but aside from not being dressed for alongside the road maintenance I
figured that by the time I did all this the pressure would release on own.

I agree that the MC is the likely culprit but at this point will assume
nothing

On Sun, Jul 28, 2019, 9:08 AM Michael Salter <michaelsalter at gmail.com>
wrote:

> Michael,  I'm sure that you probably appreciate this but ... if a brake
> hose is the culprit then either 1 front or both rear brakes will be hot AND
> the master cylinder "feel" will be approximately similar to normal.
> The fact that the pedal goes hard indicates that the entire system is
> retaining pressure and the most probable cause is the system charge valve
> within the master cylinder.
> The charge valve type in the 100 master cylinder is prone to problems as a
> consequence of its design.
> Opening a bleed screw when the brakes tighten up is the test that I use to
> confirm such a master cylinder fault.
> Remember,  correct diagnosis is 80% of the job!!
>
> M
>
> On Sun, Jul 28, 2019, 8:20 AM Michael Oritt, <michael.oritt at gmail.com>
> wrote:
>
>> I finally got to take the car out yesterday evening and while all at
>> first seemed good after five or so miles of driving the brakes began to
>> harden up and became so bad that they almost brought the car to a stop even
>> under throttle.  I pulled over and after about 30 minutes the brakes
>> released and I crept back home.
>>
>> At this point I am assuming nothing.  Other than perhaps by feel I don't
>> know how one can inspect a brake hose for internal collapse but I will go
>> over each component and probably rebuild or replace the MC on general
>> principle.  I am also going to replace the heat wrap that went around the
>> manifold which I removed when I first adjusted the brake actuating rod as
>> perhaps it was preventing the MC from overheating, etc.
>>
>> Egg on my face....
>>
>> Best--Michael Oritt
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