[AJD] What are failed Master Brake Cylinder Symptoms?

[Terry L. Hrdlicka]

Dean,

The master cylinder needs a kit.  The rubber seals on the piston(s) of 
the MC are shot.  From past experience on those old Fords, it's probably 
cheaper to get a new or rebuilt MC and slap it in than it is to get a 
kit and go through the rigamaroll of rebuilding the master cylinder. The 
big clue is the fact that you don't seem to be loosing brake fluid 
anywhere.

On the other hand, if you want to rebuild the MC, it's not that big a 
deal.  Just basically replace the springs and rubber cups, and make sure 
the cylinders are smooth, but the last time I checked, the MC's weren't 
that bad, price wise, and I guess it depends what your time is worth.

This diagonsosis is based on no other obvious leaks in the brake system.

Hope it helps,

Terry Hrdlicka
Crete, Nebraska


Dean VP wrote:
> I have a brake problem all of a sudden on 68 Ford N600. Brake pedal took
> several pumps to develop pressure, then bleeds off under pressure. If not
> used for e few minutes takes several pumps again to get pressure and then
> bleeds down slowly under peddle pressure.   No improvement over time. Can't
> tell if all four wheels are getting brake activity but there isn't much
> braking power at all even under heavy foot peddle pressure. Fluid level ok
> and not dropping. Something is terribly amiss but I don't know how to
> isolate the problem?  Master Brake Cylinder? Vacuum assist leaking? All four
> hub cylinders leaking? Leaking line? (No loss of fluid right now but Master
> Cylinder went dry over the winter during non-use!) A bunch of air in the
> lines? 
> 
> I don't recall having brakes fail this drastically before or not eventually
> self bleed. I'm really confused. Where do I start to diagnose the problem?
> Can this just be a Master Cylinder failure or is it something else? Sure not
> safe to drive this way. 
> 
> I'm reluctant to start throwing parts at the problem until I know for sure
> what is wrong. Not sure I've ever had this major of brake failure before. I
> need help.
> 
> Dean A. Van Peursem
> Snohomish, WA 98290
> 
> I'm a walking storeroom of facts..... I've just lost the key to the
> storeroom door 
> 
> 
> www.deerelegacy.com
> 
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