Re: Booster and Master Cylinder

Posted by BH On 2009/3/2 15:21:11

Owen -

I believe the AACA thread was started by the same poster as this one - just using a different screen name here.

I must admit that I misread the other thread, at first, and focused on the hydraulic failure. Yet, after a second reading, it looks like his hydraulic issue was transient and now has a pedal return problem. He could be dealing with two separate issues, each with thier own, separate underlying cause.

he also mention a problem of having to top off the fluid. I've had to do that with each of my Packards using glycol-based fluid, but not in the one using silicone (though I haven't checked any of them in years). What a lot of people don't understand is that these old hydraulic systems were NOT sealed from atmosphere. Glycol fluids seem to condense overtime; anyone who has taken the cover off of on out in the field will find sludge (at best) or a crystallized substance.

It could be that he topped of the fluid in the reservoir, but there was air trapped in the chamber below (with the compensator valve closed) - until he worked the pedal and burped it.