So I believe I have a problem with the brakes. At first I thought it was the suspension or wheel related, because my car vibrated badly over 60 mph (mostly the steering wheels and pedals).

After driving it for awhile, I noticed sometimes the problem dissapeared all together. Then I noticed when it came back, the brake pedal had way less range of motion (barely touch it and you could feel it braking, very stiff pedal) and the pedal shook badly and the steering wheel shook. Also when coming to a stop during this problem the pedal vibrated REALLY badly and shook the whole car.

If I get the car up to 70 or 80, often times the problem fades away, the pedal becomes looser, and the car rides like a dream. Sometimes it'll stay this way for a few hours before the problem comes back. Is it possible a caliper pin is stuck, or the caliper itself is going bad, or is this a symptom of a faulty master cylinder?

Before I waste a day tearing all my brakes apart, was wondering if this problem sounded familiar to anyone here.

tia