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MY BAD. Precision Rebuilders is who you want to talk to. Speak with Nathan, he will fix you up right quick. It's been too many months since I have been down this road of GMC restoration and I cannot remember any of the part or model numbers for the different air pak's. Talk to Nathan and have a...

BSI does have the seals, I had a 45 minute conversation with their shop foreman, Nathan. Older man, been there a long, long time. Even talked through email later on. He was more then helpful in getting me part numbers and how to information. Their "up front" folks at the desks pushing the...

I am working with another parts house and parts guy who has been playing with AIR PAK's for 30 years. This guy is an old timer, super friendly and knows his beans. He said he can piece together a GMC rebuild kit for under $100. It will not include a new poppet valve unit. This is the piece on...

That would be a negative buddy, BSI told me the kit they piece together for the 2500685 AIR PAK only contains soft parts. So no check valve or the big shiny control valve assembly which has a non replaceable permanant seals staked in place. I suppose depending on the condition of your AIR PAK...

Where did you find an M211 air pak kit? Everywhere I have looked has been out of them. I need one too!! That is cheaper than the 5 ton kits as a matter of fact.

Mine's got a big ol dent in it. :whistle:

Rebuild Kit For The M54/M809 5 Ton Truck Air Pack, 8333870 You will need this kit and 2 of the control valve piston seals mentioned above, from Brake Systems Inc in Oregon.

This is the 2nd time typing this out since I accidentally deleted it. So bear with the lack of enthusiasm in information listed below. The M211 and M220 trucks use a Bendix AIR PAK model # 2500685 It is unknown if this is the same model used on M135's. For those who are installing 5 ton...