Brake system is pretty straightforward system right? Here's the isuue I have been having. 65 beetle, front brakes are ghia calipers and rotors on dropped CB spindles. New, dual circuit master cylinder is correct and adjustments at the pedal cluster are also correct. All parts are not worn or old. The front right brake caliper drags on the rotor. No matter what I have tried, a mechanic has tried, the caliper drags. I have an indicator light inside the cabin which is wired as a brake light, going out when brakes are applied. For some reason the caliper is holding pressure when the pedal is pumped. Also when the brake fluid heats in the sun, the pedal gets harder due to the thermal expansion, and the brake drags. The hoses and line are both new. When the actuator rod was adjusted short, pressure would build and break the rear circuit seal, as it was not returning to the brake fluid resevoir. When adjusted long it would only catch the front circuit. The diaphragm in the resevoir is clean and not binding. My question is twofold:
- Is there a specific way the brake lines to the master cylinder need to be routed? I believe modern cars are plumbed in an 'X' pattern alternating sides front to rear. I believe I am plumbed rear brakes into rear circuit, front into front.
- In passing I have heard mentioned a pressure valve designed to compensate for the variance in distance of extension between the rear slave cylinders and front caliper cylinders.
Has anyone here heard of this type of problem? I even brought this to a mechanic (OMG!) with a whole buncha certificates on the wall, whom I believe is quite competent. This has become a real headscratcher and really quite annoying as well. Anyone? Thanks.