IF the hand brake activates through the caliper piston unit and it was necessary to screw the piston back in to fit the new pads then you will have to readjust the hand brake .. The may be a bleed nipple on the abs unit . It is not necessary to run the engine to bleed the brakes. IF you used a clamp to push the piston back in then there may be crap in the master cylinder that is affecting the operation of the non-return valve at the outlet of the master-cylinder.
SOURCE: 2001 Mustang GT rear brake job
yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.
SOURCE: Brakes won't bleed!
the brake system on these units cant be bled at home if air gets into themaster cylinder and or the (hcu) hydraulic control unit,a special anti-lock brake test adapter has to be pluged into the control module, any atempt to bleed the system with out this tool wiil result in a spongy pedal
SOURCE: 1994 ford explorer will not stop, I have replaced the brake pads,
Before you are replacing the master cylinder make it sure there is no air in the system. Even if you booster is not working the brake should work. After this still not working then replace the Master Cylinder and maybe the booster too.
Good Luck
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