Well I'm having lots of trouble with Gold Rush this week. Front brakes have pressure going to them all the time. A couple of weeks ago the left front caliper was locked up. I changed both front calipers, front pads and turned the rotors. Now when I was changing tires this week I noticed my hubs were hotter than hell. The front wheels didn't want to turn by hand either. I cracked my bleeder screw on each caliper and it freed up. O.K. so that tells me it's a master cylinder, right? Wrong, I changed the master cylinder and still does it. While bleeding the system (the rear screws open) the brake pedal only goes halfway down. Then when bleeding the front the pedal goes to the floor, but hardly any fluid comes out the bleeder. The only thing I can think of is maybe a proportioning valve, but after fifteen years of turning wrenches I've never changed a proportioning valve because it was internally bad. Look below for rig specs. Does anyone have any ideas? David 75K5 <A target="_blank" HREF=http://www.extremeblazer.com>http://www.extremeblazer.com</A> Year: 1975 Model: K5 4X4 front disc brakes Vacuum boosted power brakes Superlift extended SS brake hoses New (rebuilt) calipers last week New master cylinder this weekend Help I don't have much hair left and I'm pulling it out!!!!