P30 Brake Lockup - Solved
I have a 1988 Pace Arrow on a P30 chassis with 4-wheel disk brakes. Recently, the brakes have been getting pretty mushy and brake fluid has been disappearing regularly with no external signs of leaks....
Forum Discussion
Upon further memory probing of what I saw while replacing the MC and looking at some pics on-line, I think this is a Hydraboost system, so it's a pressure boost, not a vacuum boost. Consequently, it's unlikely to be sucking and building up a pool of brake fluid in the boost system. I'm now leaning toward a combination of excess fluid level and boiling moisture in the system, causing expansion and pressurization of the fluid reservoir when the vehicle is running at low speeds where there's less air circulation to cool the system. I'm going to completely refill/bleed the front system and see what happens. It's the easiest 1st step.
Joe
Joe
