I got an 89 civic hatch,whenever my car is cold/first start it, everyting is perfect. After 10 minutes of driving the brakes start locking up slowly until they are completely locked-up, the brake pedal gets completely stiff. ZERO play. After letting it cool down it works again until the car gets hot again... then the same problem. It happens every time. Any suggestions would be appreciated. I was reading on Proportioning valves.. but i dont think they made those for EF's... thanx