[Healeys] Front disc brakes locking up after rebuild

Bob Spidell bspidell at comcast.net
Sun Aug 7 20:19:51 MDT 2011


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
>
>


-- 
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Bob Spidell           San Jose, CA            bspidell at comcast.net

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