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What chassis is it on.? Sometimes the hoses get old and start coming apart inside.This plugs up the fluid return and drags the pads that get hot and heats up the fluid that expands and locks up the brakes.Were the calipers lubed with caliper grease on the slides when replaced.If not may have one hanging up.Was the master cylinder removed or replaced.??If so take lid off of it and watch fluid as someone steps on pedal.Watch for a spurt of fluid up in the master cyl. If no spurt of fluid you may have push rod out of adjustment,If push rod is to far forward when replacing master cyl.it won't let piston return far enough to let fluid return to cyl.This will cause pressure on the pistons and start the heating process that locks up the wheels.I just finished my 86 Winnie last week for caliper draging and lock up. Good Luck and keep us posted it may help someone else. Mike |
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