I took apart rear brakes emergency brake is off on car,cap is off on m/cyl,screw typ pistons on rear calip.bought box type special tool to compress piston,3/8 rachet applied pressure,while turning clockwise piston will compress in why is there another relief valve i need to open?? tried bleeder valve still wont move r/side of car
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One, take your brake fluid reservoir cap off.
Two, use a thin piece of wood to help you compress the piston on the caliper....do it slow. This way, you don't create a lot of pressure to the reservoir and it won't overflow.
Three, these are the steps to removing and replacing the pads for the rear. It does mention a special tool....but you can use a c-clamp for the same purpose:
Check the brake fluid level in the brake master cylinder reservoir.
If required, remove the fluid until the brake master cylinder reservoir is half full.
CAUTION Care must be taken when servicing rear brake components without disconnecting the parking brake cable from the brake caliper lever.
Remove the disc brake caliper. Support the caliper with mechanic's wire.
CAUTION When the brake pads are separated from the brake caliper, new brake pads must be installed. The brake pads are one-time use only.
Remove and discard the brake pads and spring clips from the brake caliper anchor plate.
NOTE: Do not remove the anchor plate guide pins. The guide pins are press fit to the brake caliper anchor plate. If the guide pins are damaged a new anchor plate must be installed.
Inspect the brake caliper anchor plate assembly.
Check the guide pins and boots for binding or damage.
Install a new brake caliper anchor plate if it is worn or damaged.
To Install: NOTE: The left caliper piston turns clockwise and the right caliper piston turns counterclockwise.
Using the special tool, turn and compress the brake caliper piston into the cylinder.
Clean the residual adhesive from the brake caliper fingers and pistons using the specified brake parts cleaner.
CAUTION Do not allow grease, oil, brake fluid or other contaminants to contact the brake pad or caliper mating surface. Do not install contaminated pads. NOTE: Install all the new hardware supplied with brake pad kit.
Install the new spring clips and brake pads.
Position the brake caliper and install the 2 bolts. Tighten caliper bolts to 23 ft-lbs (31 Nm).
If necessary, fill the brake master cylinder reservoir with clean brake fluid.
With the engine running, apply pressure on the brake pedal to seat the brake pads.
You can compress the piston with a large C clamp. Screw type pistons are generally at the rear, when caliper is also used as emergency brake. I generally use the inner brake pad to protect the piston from damage while compressing it. If it does not retract it may be frozen or the rubber line going to it has internally failed. After completing change, pump brake a few times to re-set piston position so you have brakes.
hello rule of thumb never push pistons back on calipers without master cyl cover off pressure blows seal out on mastercylinder what you need do is from the firthest wheel pass rear bleed first then drivers rear then pass front to drivers side to mastercyl lines rear to front sounds like trapped air in proportioning valve with two people pump pedal up 3-4 hold take cover off master watch brake fluid take foot off brake pedal quick watch for air bubbles or small geiser like movement you need to work the air out reinstall cap repeat again if needed there shouldnt be any ripples when the peddle is let go if rear calipers have built in emergency brakes use emergency brake to wind caliper piston a few times goodluck