[Healeys] Master Cylinder

Rich C richchrysler at quickclic.net
Fri Jun 18 11:14:26 MDT 2010

Hi Keith,

Ensure there is enough free play in the push rod distance as others have 
already stated, but also make sure the push rod clevis pin end is able to 
clear the toe board adequately. This sounds strange but if the toe board 
area has had metal work done there and the diamond shaped pressed relief in 
the toe board metal is no longer there allowing sufficient clearance, the 
push rod can't allow full release of the piston rod.

Also, I always bleed the brakes using an Easi-Bleed kit that gently 
presurizes the system via the reservoir. I use an old tire with no more than 
about 12 PSI.  No pedals to pump, just go around and open each bleed screw 
one at a time from furthest from the 4 way junction to closest, until there 
are no more bubbles, and you're done.

See diamond shaped releif pressings for both LHD and RHD toe boards in pics 


From: "Keith Bailey" <keithbailey5 at bigpond.com>
Sent: Friday, June 18, 2010 3:52 AM
To: <Healeys at autox.team.net>
Subject: [Healeys] Master Cylinder

>    I am experiencing problems with my (suspect) Master Cylinder on my BN1
>    With the Master Cylinder on the bench in a vise with the reservoir
> connected
>    to inlet with oil in it and the outlet connected to a pipe which is
> blanked of
>    there is hard pressure. When fitted back to car there is no pressure 
> when
> attempting
>    to bleed brakes all the wheel cylinders are new.I feel sure the problem 
> is
> in the Master
>    Cylinder but lost for answers
>      Regards Keith

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