Reply to "Brake booster won't hold vacuum, should I rebuild/replace it?"

bosswrenchMember

To duplicate Bobby Byars GM conversion brake booster, the thing needs to be completely stripped and the stud pattern on the pedal side weld-converted from GM 3-stud SAE to a 4-stud metric to match DeTomaso's bolt pattern. Then reassembled and gold-alodined.

How Bobby did all this for the price he charged, I have no clue- and it had a warranty. The matched aluminum master cylinder was included. Inside one MS port is a 'keep-alive' check valve about the size of a very thick nickel for the front calipers, I always remove those since I had such a valve stick, once upon a time.

Otherwise, the only thing to watch out for (in shipping) is the vulnerable plastic valve on the pedal side is not not damaged. I never asked what model of GM it came off of- sorry. Mostly just check the booster OD to be sure it fits under the Pantera hood; not much clearance and the GM is slightly larger. Good luck-.

4/4/232:45 PM

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