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Thanks for your detailed reply. I’ve already removed and disassembled the airpack, waiting for rebuild kit to arrive. I will definitely confirm that the vent line is clear tomorrow.
Doesn’t the airpack have a plunger with brake fluid on one side and air on the other? When you apply the brakes the plunger moves and regulates how much air is applied to the air piston?
Here’s what I noticed today:
The truck was not running, zero air pressure. No bubbles in the m/c reservoir.
Started the truck and let air pressure build, bubbles began to rise up in the m/c.
I never touched the brake pedal at all.
I assume the underhood vent is for when you release the brake...
Trying to improve a soft brake pedal and have bled the entire brake system. Noticed a slow, steady stream of large air bubbles coming up into the master cylinder reservoir when the air tanks are pressurized. Is this the sign of a bad airpack?
Just joined SS. I bought a ‘75 M109a3 last year and have learned much about my truck from this website while getting it the way I want it. Figured it was time to join.
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