You need a C-clamp to do it! use a 1" thick block of wood between the piston and the clamp and retract it back. if there are two pistons MAKE SURE BOTH OF THE PISTONS RETRACT AT THE SAME TIME. AND BE SURE THAT THEY DO NOT GO IN ON AN ANGLE.
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Your RIGHT side brake disk caliper is probably siezed so all braking power is going to the left causing the pull. Wheel off, disk pads out, pump out the pistons in the caliper JUST A LITTLE. Clean with a copper brush and brake fluid until polished (Careful not to catch the rubber dust seals). Push pistons back in. Re-fit pads and wheel.
Other thoughts on this. Check for a lip on the disk caused by wear as well.
That's the super cheap, pay nothing for parts option. You should consider: Changing both sets of brake pads If the disks are worn, changing the disks too (you may be able to grind a lip off if you have the nerve). If the caliper still sticks, new pistons or piston and caliper
The piston has to spin clockwise while keeping light pressure to compress,having the bleeder open at the same time makes it easier.There should be slots or holes in the piston ,you may have to buy a socket to be able to turn the piston.
with the caliper off the disk assembly -- you can use a big C-clamp to compress the piston in. also if a C-clamp is not around, you can simply loosen the 'zerk' fitting ( the bleeder ) and push the piston hard by hand. ( note: oil will shoot out of bleeder, so put a rag over it to protect your eyes and brake parts ) -- also make sure when you put it all back together that you bleed the brake lines of all air.
Remove the brake master cylinder filler cap and remove fluid until the reservoir is half full.
Raise and safely support the vehicle.
Remove the rear wheel and tire assembly.
CAUTION Never allow the brake caliper to hang from the brake hose.
Remove the two disc brake caliper pin bolts.
Lift the disc brake caliper from the anchor plate and position the caliper out of the way. Do not disconnect the fluid line.
Inspect the disc brake caliper for leaks and replace the caliper if necessary.
Remove the pads and retraction clips.
To Install: CAUTION Do not allow grease, oil, brake fluid or other contaminants to contact the pad lining material.
Install retraction clips.
Install the brake pads.
Slowly compress the caliper pistons with a large C-clamp.
CAUTION Use care not to damage the bleeder screw or front disc brake rotor shield.
Install the disc brake caliper.
Install the disc brake caliper pin bolts. Tighten the pin bolts to 26 ft. lbs. (35 Nm) (F-250, F-350 SRW). Tighten the pin bolts to 56 ft. lbs. (76 Nm) (F-350 DRW). Tighten the pin bolts to 46 ft. lbs. (62 Nm) (F-450 F-550).
Install the wheel and tire assembly.
Lower the vehicle.
Fill the brake master cylinder reservoir with DOT 3 motor vehicle brake fluid.
Yes. Rear disk brakes on all cars requires turning the piston while retracting.
There is always some sort of notches or holes allowing for some sort of tool to do this.
But you can always improvise something.
Or you can buy a universal kit for this from Harbor Freight.