[ROVERNET - UK] Sticking Dual System brakes

Eric Russell p6rovers at yahoo.com
Tue Apr 4 07:11:11 BST 2006

With the diaphragm and plastic piston removed, drape a
rag over the piston orifice (no snickering in the
back), and stand on the brake pedal with the engine
running.  If the piston is trapped in the rag, that
part of the system is working.  If the little piston
doesn't move:
1.  The little cup seal in on the wrong way round
2.  There is some surface rust gripping part of the
piston (it has to move easily)
3.  You have other problems which need to be diagnosed

We can discuss options after the test.


--- geffandjulie <geffandjulie at comcast.net> wrote:

> After much expense and agony, my mechanic and I
> installed an overhauled 
> Master Cylinder. Brakes Ok. Yesterday I knocked the
> front of the air control 
> valve off accidentally. Lost some of the little
> bits. Fortunately I had a 
> NOS spare, and installed it. Now the brakes are very
> slow to release. The 
> control valve is labelled Lucas LK11032, and fit
> perfectly. I noticed that 
> the plastic piston that mates with the diaphragm did
> not move anything 
> inside the MC.  Any help appreciated!
> Geff and Julie McCarthy
> AvMedSafe
> 503-241-8468 
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