Nissan Repair: brakes 98 quest, black lable, ford dealer

Question
after doing front brakes and pushing in front calipers. brakes on left front and right rear lock up on brake apply and will not release . you can bleed off brake fluid at lines or at master cylinder and brakes loosen up. has new master cylinder and changed abs pump same problem . can you help me with this thanks terry

Answer
Terry,

I will assume the problem was there with the old ABS unit.  If this is the case, I would bleed the brakes really good.  Sounds like you have a blockage that will not allow the fluid to release back to the master cylinder.  The Quest is known for this problem.  If it were me I would bleed all lines with Ford High Performance Brake Fluid that you get from a Ford Dealer.  It is the black lable bottle and has twice the boiling point of the normal brake fluid.  If, by bleeding, you cannot get the calipers to unlock, pry them back in the bore and press the pedal a couple of times to get the ABS to release.  If it does not you are looking at another ABS unit or the brake lines have blockages.  I ahve had to remove line ends at the calipers and clow compressed air through the lines to find the blockage.  I even had one where the rear line had been crushed shut and it drove me nuts until I found it.  Replaced the line and it worked properly.