[Healeys] Front disc brakes locking up after rebuild

[WILLIAM B LAWRENCE]

In order for that valve to release properly you need to have about 1/16"
clearance between the end of the actuator rod and the master cylinder piston.

Bill Lawrence

> Date: Sun, 7 Aug 2011 19:19:51 -0700
> From: bspidell at comcast.net
> To: ronald-ray at sbcglobal.net
> CC: healeys at autox.team.net
> Subject: Re: [Healeys] Front disc brakes locking up after rebuild
>
> This is a SWAG, but from the description it sounds like a problem with the
small seal that closes the line to the
> reservoir when the brake pedal is pressed.  If this seal isn't released when
the brakes are released the brake system
> will remain pressurized.
>
> How sure are you that you got this plunger assembly assembled correctly?  I
think there's a seal, the plunger, a spring
> and a thing that looks like a thimble with slots cut in it.
>
> IIRC, the problem with the 'Classic Gold' M/Cs Moss sells was that the
spring-loaded plunger that engages this seal
> would get cocked in the cylinder, which could cause this problem.
>
> Bob
>
>
> On 8/7/2011 5:23 PM, Ron Ray wrote:
> > Folks,
> >
> > After rebuilding the hydraulic system the front brakes do not release.
If
> > the bleed screw is loosened, they do release.
> > The rear brakes do not lock up
> >
> > All rubber hoses were replaced.
> > All original steel brake lines were clean with air pressure.
> > The connector valve on the passenger side was removed and cleaned with
air
> > pressure.
> > The caliber pistons can be moved by hand when they are off the car.
> >
> > When the front brakes lock up, the master cylinder piston does not return
to
> > the full "forward:" position.
> >
> > Any suggestions would be greatly appreciated.
> >
> > Thanks
> >     Ron
> >
> >
>
>
> --
> *******************************************************************
> Bob Spidell           San Jose, CA            bspidell at comcast.net
>
> *******************************************************************
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