Hello everyone, just have a question about my '91 20V Turbo Quattro 200. When it's really hot outside or really humid, sometimes the brakes stick. Not so much that I can't move, but all the brakes noticeably stick on and it decreases my gas mileage, not to mention I have to stop driving in order to save my pads/rotors. When this happens, the brake pedal also goes out of order, where there's about three inches of push I have to give until I get resistance and can apply braking pressure. Any ideas on a fix? Is it the master calipers?

p.s. - It's all four brakes that stick on

 

Sounds like it could be the brake master cylinder. How long has it been since you replaced/flushed the brake fluid? That may be a place to start.

 

If the return orifice in the master cylinder is clogged, the pads will not return fully when the brakes are released. The piston remains down in the master cylinder, and is why the pedal requires a bunch of travel before there is any resistance.