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Another update. I got the bleeder screw to stop leaking by taking out the old and giving the brake pedal a quick tap to squirt some fluid. In with the new screw and tightened down but then discovered it was also leaking from the bolt just below that in the air pack. I circled in the diagram...

Thanks! I know they seal by seating and not threads but the screw itself appears to be steel and not brass so it's going to take a lot to get it to seat if it is galled or in any way not flat/rounded on the end. I replaced the master because it was old and appeared to be leaking from more than...

The bleeder screw is the one on the air pack where the line comes out of the back of the master cylinder into the "top front" of the air pack. I didn't get any kind of replacement with the new master cylinder. I believe they are the same as the wheel cylinder bleed screw but, of course, my...

I have installed my remote reservoir and the new master cylinder. I got a new line from Mikes and it is now installed. Unfortunately, brake fluid is oozing slowly around the bleeder screw on the air pack. Should I replace it or pull it and put some paste thread seal on it? I've tightened it...

You do... There's some kind of metallic-like silverish stuff that I have found on every fitting I have removed so far including ones for coolant. In most cases it is completely broken down and there's very little structure to it as I clean it off but some are still a little "tapey".

I'm amazed at the stupidity of motor pool people. The "maintenance" on this truck was likely performed by a motor pool rather than previous owners. First owner bought it as surplus and stored in his garage for 14-15 years. Second owner bought it and had buyers remorse. Lied his arse off on...

As I dug into the rear axle and replaced the wheel cylinder, I knew I'd need to bleed the system and did a thorough inspection of the master cylinder and airpack. They appear to have been both replaced at some point but there was a small amount of leakage from the master cylinder around the...