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YOU NEED TO REMOVE THE REAR WHEELS.REMOVE PARKING BRAKE CABLE CLIP FROM CALIPER DISCONNECT PARKING BRAKE CABLE.HOLD THE GUIDE PIN WITH A BACK UP WRENCH AND REMOVE UPPER MOUNTING BOLT FROM THE BRAKE CALIPER.SWING THE CALIPER DOWNWARD AND REMOVE THE BRAKE PADS.TO INSTALL NEW PADS.YOU HAVE TO RETRACT PISTON INTO THE HOUSING BY ROTATING THE PISTON CLOCKWISE.PUT EVERYTHING BACK VISA VERSA.
If you are replacing the rear pads and are trying to retract the caliper pistons here is what you need to do. Use a piston installation tool in order to twist the brake caliper piston into the brake caliper bore. If you do not have the tool you can retract the piston by using a needle nose plier. Exert downward force and rotate clockwise until the piston bottoms out. Before installing be sure the two "U" shaped slots are at 6:00 and 12:00 Oclock.
you will need to remove the brake line from the caliper, if the caliper will go back then you could possibly have a bad brake line. Also, you should open the reservoir when pushing the caliper back to allow the pressure to release. If the caliper does not go back, then you will need to either rebuild or replace the caliper.
If you can't see diagrams(sometimes happens) let me know and I will get them to you
Raise and support the vehicle. Remove the rear wheels.
If equipped, disconnect the brake pad wear sensor from the harness.
Counterhold the lower sliding pin using a thin open-end wrench and remove the caliper-to-sliding pin hex bolt.
Pivot the caliper upward or if necessary remove the upper caliper-to-sliding pin hex bolt.
a brake caliper retraction tool, select the appropriate sized piston
press arbor and install the tool onto the brake caliper. Following the
tool manufacturer's recommendations, use the tool to rotate the caliper
piston clockwise as it is pressed into the brake caliper housing, until
it is fully retracted.
Use a thin open-end wrench to . . .. . . support the caliper sliding pin when removing the caliper mounting boltUse a disc brake caliper piston retracting tool that will rotate the caliper piston as it is pressed into the caliperThe rear caliper piston is slotted to allow a retracting tool to rotate the piston when replacing the brake padsTo install:
the brake caliper and all sliding surfaces. With the caliper piston
pressed fully back into the caliper housing, check for leaking fluid
and damaged dust boots.
If equipped, install a new brake pad
wear sensor in the pad if the plastic part has been worn through on the
old sensor. New sensors are not required unless the wire inside the
plastic part has been exposed.
Lubricate the slider bolts with approved brake grease.
the brake pads onto the bracket assembly, and then carefully lower the
caliper over the caliper mount. Check and make sure that the pad
springs are correctly seated.
Replace all removed caliper-to-sliding pin bolts and torque to:
1990-97 Passat models: 25 ft. lbs. (35 Nm)
1998-00 Passat models: 22 ft. lbs. (30 Nm)
equipped, connect the brake wear sensor wire to the harness. Check for
a good connection as most problems with the sensor circuit are caused
by faulty connections. Check that the wire is held by the loop in the
dust cover and the connector is held at the clips.
wheels and hand tighten the lug bolts. Lower the vehicle carefully
until the tires begin to contact the surface and torque the lug bolts
to specification in a crisscross pattern to:
If its the front brakes you are working on and the piston won't retract into the caliper then you need a new caliper, or both actually. Calipers need to be replaced in pairs. If you are working on the rear then you need a special tool to turn the piston back into the caliper. you can get the rear disc brake tool at any auto parts store. Turn the piston clockwise to retract it, and pay attention to the little spots cut out of the piston that the tool grabs to turn it. They need to be at the top and bottom of the piston once you fully retract it or the little pin at the bottom of the inside brake pad wont sit against the piston. And once again if it still wont retract then you need to replace both calipers. Once you are finished you need to pump up the brake pedal and then pull up the parking brake lever and release it 10 to 20 times to adjust the piston.