Well the cold weather is back. Here in Ellensburg it's been in the single digits for the last 3 days and I've noticed a problem with my brakes. Sometimes when I am stopped and holding the brake pedal it will slowly go to the floor and the brakes will let go. It doesn't do it very often, but enough to worry me about running into a parked car or something. The fluid level is fine but looks a little dark, and I've checked the calipers and drums for leaks and found nothing. So, what could be the problem? I don't think the booster is losing vacuum, I've checked the connection. Maybe a master cylinder? I want to add disc brakes in the spring so if I could hold off on a master cylinder until then it would be great. By the way it's a '76 K20 thanks again.
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