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probably none of the above
have the brake master cylinder replaced first
then work on the pins that allow the calliper body to self center
probably seized on the pins holding one pad on the rotor
Sounds like your master cylinder is not working properly, so you may have to replace it as there does not seem to be the correct amount of brake pressure that gets to the rear brakes. Are your rear calipers or brakes seized, to they move freely. Is the parking brake cable seized and causing the rear brakes to not function properly. Lots of thing it could be.
Problem is in your master cylinder assembly. It may be an obstructed compensator, piston seized in bore, or deformed piston cups. Have also your brake lines checked for obstruction.
Does your car have disc brakes around? rear caliper pins are common to seize, when rear brakes are replace is a good practice to have your shop replace rubber boots and clean pins on a wire wheel to remove all rust, also use a honning tool to clean caliper slides holes to bare metal assemble with a good quality brake lube. Caliper brackets(holders) also have to be clean by removing brake pads clips, clean back and front and grind off all rust from braket. this is one part may help, but have some concerns with your brakes lacking up after driving for a while, this is a symptom cause by a miss adjusted brake booster rod, when ever you replace a master cylinder you have to check the leng of it or your brakes will lockup somethimes so bad it won even move, have your shop set this to specs. good luck
CHECK THAT THE MASTER CYLINDER IS ADJUSTED PROPERLY TO LET FULL RELEASR AFTER LETING UP APPLY PRESSURE AND LET OFF BRAKE POP THE LINE TO THE LARGE SIDE OF MASTER CYLINDER IF ANY PRESSURE IS PRESENT ADJ ROD BETWEEN MASTER CYL AND POWER BRAKE UNIT ANDJUST IT SHORTER A HALF TURN AT A TIME TILL NO PRESSUR OR BRAKES RELEASE THEN ADD ONE HALF TURN MORE HOPE THIS HELPS GOOD LUCK
Replace the brake hose. An internal tear in the hose can allow fluid to flow into the caliper, but collapse inside not allowing the pressure to release.
YOU NEED REMOVE A LITTLE BRAKE FLUID FROM MASTER CYLINDER.THEN YOU RAISE VECHICLE SAFELY.SUPPORT IT WITH JACK STAND.MAKE SURE VECHICLE IS ON LEVEL SOLID GROUND.REMOVE TIRE OR WHEEL.THEN YOU NEED A LARGE C - CLAMP.PLACE C - CLAMP OVER BRAKE CALIPER AND BRAKE SHOE BACKING.TIGHTEN C - CLAMP JUST ENOUGH PUSH CALIPER PISTON BACK IN CYLINDER BORE TO REMOVE CALIPERS FROM ROTORS.TO REMOVE BRAKE CALIPER YOU NEED 2 OPEN AND BOX END WRENCHES ONE TO HOLD CALIPER SLIDE PINS AND THE OTHER WRENCH FOR LOOSEN CALIPER BOLTS.THEN YOU REMOVE CALIPER AND REPLACE FRONT BRAKE SHOES.IF YOU NEED TO REMOVE BRAKE ROTORS JUST REMOVE THE BRAKE CALIPER CARRIER SUPPORT BOLTS THE REMOVE THE BRAKE CALIPER CARRIER SUPPORT THEN REMOVE ROTOR.YOU NEED TO REPLACE BOLTS WITH NEWS AND USE LOCK TIGHT.THEN YOU PUT IN NEW BRAKE PADS IN CALIPER PUT CALIPER BACK ON SUPPORT CARRIER.REPLACE WITH NEW BOLTS USE LOCK TIGHT THEN TORQUE BOLTS TO 26 FT LBS.MAKE SURE MASTER CYLINDER COVER IN PLACE.WHEN YOU FINISH REPLACING BOTH FRONT BRAKE PADS PUMP BRAKE PEDAL TO SEAT BRAKE SHOES AGAINST BRAKE ROTORS SO YOU WILL HAVE FIRM BRAKES WHEN YOU APPLY THEM. THEN CHECK YOUR BRAKE FLUID LEVEL IN MASTER CYLINDER MAKE SURE ITS NOT LOW. MAKE SURE YOU HAVE FIRM BRAKES BEFORE DRIVING.IF YOU HAVE ANY PROBLEMS CHANGING FRONT BRAKE PADS YOU CAN GO TO ANY AUTO PARTS STORE AND BUY A HAYNES REPAIR MANUAL.
Ok Have you recently replaced the pads? Do they act normal after they cool down? Are the pads in good condition, pads that are so worn that the caliper pistons come out beond their normal limit may stick there due to excessively worn pads. If so make sure they are at least factory grade quality Good are bendix, the only thing that can cause your symptoms is a bad master cylinder because it affects BOTH front calipers equally if it was a caliper it is likely to affect only ONE. Let me ask you this happens after driving in heavy traffic or after along drive?
If So there have been countless cases of boiling brake fluid, Old Brake Fluid gathers moisture and its boiling point is lowered, Fluch out ALL the old brake fluid and have new put it.
also is there any chance even the slightest chance that something other than brake fluid even a drop or two is enough to do damage. has been added to the master cylinder at any time? If so you need to replace EVERY PART IN THE BRAKE SYSTEM INCLUDING THE ABS CONTROLLER THAT HAS ANY RUBBER PIECES IN IT CALIPERS HOSES WHEEL CYLINDERS,MASTER CYLINDER just for your information.
I believe you have a bad master cylinder but do not buy a rebuilt one only bran new and preferably from the dealer.
Please contact me if you need more help and would you give me a good rating if you feel my information is helpful.
Thank you ,Randy
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