My brakes are locking up consistently after 4 miles. They drag but it stops when I bleed only one brake line even though all 4 brakes lock. I replaced the master cylinder and the problem is still going on. Brake booster seems like the culprit but brake masters told me it was the cylinder before I got it replaced. Any help would be great. I have an 88 z31 na 2+2

 

what condition are your calipers in? If they're as old as the car, they could be sticking due to corrosion on the pistons or the on the pins.

 

The calipers are good. So are the Pistons. I cleaned them recently as well

 

one possible. when you don't have enough free play in your brake pedal the brakes will apply themselves as the fluid heats up during driving. Happened on my 83

 

Which is a common phenomenon for me. Are all brakes seizing up after 4 miles or is it still the back brakes only?

 

All 4 brakes seize up

 

How can I adjust that?

 

reading the fsm might be a good start. otherwise stand on your head under the steering wheel and figure it out. I usually take out the seat much easier.

 

Download a free FSM (Factory Service manual) here.

XenonZ31 Reference