The brakes on my 94 4runner had intermitten pressure and grab. I blead system (RR,LR,RF,LF,LSPV), R&R'd Master Cylinder, and R&R'd front pads. Now my pedal easily goes to the floor with engine on. I tried bleeding the brakes after parts replacement and now I can't seem to build up press. in order to bleed system.
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When you do that, you must bleed the whole system in a sequence order. You start with the brake line that is the longest and bleed that and then move to the next and so on. So you should have bled RR, LR RF and LF brake lines in that order.
generally this means the pins need lubed up. however, I ran into this problem with another vehicle. Make sure that the bleeding proceedure is right. Not all vehicles are rr, lr, rf, lf. Also make sure you bleed the master. The final result of the vehicle I was working on was replacing the master, bleeding lr, rf, rr, lf.
Still have air in the system. May need to have them bled at a shop that can use a bi-directional scanner to bleed the ABS electronically. First try bleeding them manually starting at the right rear and working your way closer to the master cylinder (RR, LR, RF, LF). Be sure to bleed each wheel until you get fresh clean fluid and be sure to keep the reservoir full during the process.
i think you still have air in the brake system.open the bleeder screws one at a time and let it gravity bleed on its own.rr,lr,rf,lf.with a broken line it takes a while to get all the air out.it can be frustrating some times.