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did you check the brake booster ? how long you use the brake booster? may be have no enough pressure in vacuum brake booster. get more details here for help : http://www.fiverhope.com/ http://www.fiverhope.com/category-67-b0-Brake-booster.html
of the brake fluid out of the master cylinder.
Mark the relationship of the wheel to the wheel stud for re-installation purposes. Remove the tire and wheel assembly.
Install 2 lug nuts to secure the rotor in place when the caliper is removed.
Install a large C-clamp over the top of the caliper housing and
against the back of the outboard shoe. Slowly tighten the C-clamp until
the caliper pistons are pushed into the caliper bore enough to slide the
caliper assembly off the rotor. Use care not to tighten the C-clamp too
far or the outboard shoe retaining spring will be deformed and require
Remove the caliper mounting bolts and remove the brake caliper from the mounting bracket.
DO NOT disconnect the brake hose from the caliper or allow the
brake hose to support the weight of the caliper. Support the caliper on a
piece of wire out of the way.
Remove the outer brake pad from the caliper using a suitable
prying tool to lift the outboard shoe retaining spring so that it will
clear the caliper center lug and pull the brake pad out of the caliper.
Remove the inner brake pad by unsnapping the shoe springs from the piston.
Clean all parts well. If the brake pads were worn so badly that
the brake rotor is damaged, it must be replaced. Light scoring of the
rotor surfaces not exceeding 0.060 inch (1.5mm) in depth is not harmful
to brake operation and may result from normal use. Brake rotors may be
refinished. Do not use a rotor that, after refinishing, will not meet
the thickness specification cast in the rotor. Always replace with a new
If not done at removal, now use a C-clamp and clamp both pistons
at the same time with a metal plate or wooden block across the face of
both pistons. Take care not to damage the pistons or caliper boots.
After bottoming the pistons into the caliper bore, lift the inner
edge of each caliper boot next to the piston and press out any trapped
air. Make sure each boot convolution is tucked back into place. Boots
must lay flat.
Inspect the caliper bushings for wear. Replace as necessary.
Carefully inspect the slide bolts for corrosion. If corrosion if found,
use new parts including the bushing assemblies when installing the
caliper. Do not attempt to polish away corrosion. Lubricate caliper
slide bolts with silicone grease.
Install the new inner disc brake pad in the caliper by snapping
the shoe retainer springs into the piston making sure both sets of
locking tabs are seated in the caliper pistons. The pad must seat flat
against the pistons.
Install the outer pad into the caliper by snapping the outboard
shoe retaining spring over the caliper center lug and into the housing
slot. The pad will slide up onto the caliper and the retaining ring will
lock into place on the groove in the caliper.
The outer pad wear sensor should be at the trailing edge of the shoe during forward wheel rotation.
Install the caliper mounting bolts and torque to 80 ft. lbs. (108 Nm).
Remove the 2 nuts temporarily securing the rotor.
Install the tire and wheel assembly and tighten to specification.
Pump the brake pedal several times to seat the pads against the rotor.
Check the brake fluid level and top off as necessary.
Road test the vehicle to ensure the proper brake performance.
1. Machine or replace rotors and/or Drums
2. New Disc Pads and /or Brake Shoes & springs for brake shoes
3. New or recond Brake Booster
4. New or recond Master Cylinder
5. New or recond Disc brake calipers and/or wheel Cylinders
6. Brake fluid
7. Check all the brake fluid lines for any damage
thats about all I can think of, hope it helps
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.
If you just had the brakes done take it back to that place and if a doityourselfer did it, um i wouuld check each wheel look for missing pad of shoe linning came off or better the hardware the the rear shoes or held down with,Thank you for using FixYa.com, Lee Davidian