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I also learned that neither airpack (longer old style, nor the shorter new style) have residual check valves in them.... although you can get kits for them that install on/in the end of the airpack which would be a good spot to put them as SP5 mentioned.

Just for future reference for people with the dual circuit brakes on their 87-89 M35a2/M109a3 trucks and M35a3/M109a4 trucks, the Master cylinders are NOT the same. Besides the obvious difference of the A3 trucks having a remote mounted reservoir, they have some other differences. 87-89 A2...

Gringeltaube, you nailed it again! After much frustration and work (not to mention Money spent ordering some airpack rebuild kits and orings for the MC) I checked the pushrod, and found that it had come out of the piston bore in the M/C so it was pushing against the face of it. So as you...

Okay guys, I need some dual circuit help. I still cant figure out whats going on with my truck. Yesterday I changed out the right steer wheel brake cylinder because it had some leaking I found behind the seal, other than that everything was working fine. I then bled the brakes per the single...

Post 31 & 33 talk about how he used a pressure bleeder. I was wondering if we could just hook up 10psi air to the 1/4" reservoir vent line on the firewall to pressurize and power bleed it, you would just have to keep the reservoir full though right.

I'm glad I finally found this thread! Today I replaced a wheel cylinder (right steer) on my 88 Air force M109A3 with the dual circuits. Bled the brakes and the brake pedal will not move now, its hard as a rock. At first the brakes were locked, I drained all the air and the brakes were still...