[Healeys] Brake issue

[Michael Salter]

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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