[battlecat]

Originally Posted by maxwedge

This is usually not a diagnosis over the internet, yes the booster could be at fault, so could sticking calipers, the rear were always problematic, so could the proportioning valve, especailly if the fluid has not been changed, water accumulates and rust can form throughout the system. Confirm good vacuum to the booster, also check the check valve at the booster, then the system must be gone thru for additional checks.

Thanks, Maxwedge! You've given me some ideas I can pursue...I'll let you know what I come up with!