My brakes need a lot of leg on them to get the car to stop. Brake Booster worked fine prior to my E21 M42 swap, but 12 months later, after install, the PBB seems to have failed? Or maybe I am missing something.
I did re-use the E30 M42 check valve, the diaphragm seemed healthy. I thought there was a check valve on the e21 PBB, but it just seems to be a plastic elbow (already purchased a replacement). Anything else I can check before I start looking for a new booster?
Maybe some master cylinder seals or rings I need?
sound like it's not getting vacuum. could you have put the check valve in backwards?
Last edited by okieflats; 07-22-2018 at 03:51 AM.
Also check and make sure the o ring at the base of the master cylinder is seated in the groove and in good condition, I went through something similar when I replaced my MC
It was the master cylinder o-ring. I purchased a new one and never installed it :/
I did the same, glad it was an easy fix
Ill have to check this out once my car has a good engine in it. The brake pedal is hard, but I could still lock all 4 up so I didn't investigate too much.
Its funny how you have a box of parts and forget what the part is for until you remember why you bought it or what for. Now to figure out what these box of crank bearings were for....
Thats where I was... it was safe for the surface roads but I wouldnt get on the highway with it.
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