SOURCE: cant compress piston on rear brake calipers
Use a caliper wind back tool which rotates the piston at the same time as pushing it back. Release the bleed screw to assist the wind back. If you use a brake hose clamp on the brake hose this will reduce the need to bleed the system.
SOURCE: Removing front calipers to 2003 vw passat w8
go to a tool store and ask for an easy-out, this is a specialty tool placed on a drill to grip stripped screws and broken bolts
SOURCE: cant push back cylinder on rear brake caliper on vw golf 1.4s
You will need to check to see if your VW has anti-lock brakes installed on it. The pistons that push in usually look like an inverted cup, hollow end facing the brake pads. The pistons with antilock brakes are usually solid across the top facing the brake pads and will need to be rotated in order for them to collapse back inwards. Some rotate easily, others are a bit more difficult. The pistons on my VW Beetle have two (2) angular grooves opposite one another. If your look like this you may be able to use the blunt end of some needle-nose pliars, or you can head over to your local auto parts retailer for a "magic box", a square cube with as many as five (5) different patterns for the buttons that insert into the angular grooves on different vehcles. Find the pattern that best fits your grooves and attache the magic box to a 3/8 rachet with an extension. Rotate the piston slowley in one direction, then the other to loosen it up. To collapse the piston I believe you will need to rotate counter clockwise. Good luck, this style piston is only on the rear wheels.
SOURCE: How do I retract the caliper piston?
Note on rear-caliper piston tool:
Instead of
paying $50 for the VW or similar custom tool, you can use a generic $5
import "cube" tool available at most national-chain part stores.
#
One side of the cube has 4 prongs. Grind or file off 2 diagonally
opposite aka kitty-corner prongs to allow the cube to fit the vw rear
brake piston.
# Use with a 3/8" ratchet. It can be easier to fasten
the rear caliper back onto the carrier without the rotor in place while
using this tool. That way you get a little extra leverage.
# Use as
follows: engage the two prongs and turn piston 180° clockwise.
Remove the tool. Use a generic caliper tool or a c-clamp and push the
piston in about 2mm. Keep alternating back and forth between the cube
tool and the c-clamp until piston is almost all the way in. If you
are strong enough, you may not even need the c-clamp - just push with
the cube tool as you turn. Instead of the cube, you can even use
needle-nose pliers, but then you definitely need the c-clamp.
# Even
with this special tool, the rear brakes can be rather difficult, so
make sure you have plenty of time. I still recommend purchasing or
renting the $50 professional tool cause it is much easier to use.
#
If you're
totally confused by all this, just take your wheels off and
look at the brakes up close. Its simpler than it sounds on paper. And
get the Bentley publishers shop manual for your car. That book pays for
itself after one or two jobs. If your still at lost, Auto Zone has the
loner tool you'll need for $50.00 and you'll get it back after you
return the tool and they can give you the step by step instructions
mentioned above. Good luck.
SOURCE: how to compress rear brake caliper piston
Only way is to use diagnistic equipment.Go to HAND BRAKE . There is option to release the pistons.When you change the brake pads you have to use option - engage .
Rear disc brake assembly includes; rear brake disc, rear brake pads,
brake caliper
mount and a caliper mounting screw. (Note: Some vehicles do not have the
rotor mounting
screw.)
To replace rear brake pads and rotors the rear brake caliper needs to
be removed.
First loosen the rear brake caliper mount bolts and remove them. Turn
counter clockwise.
After the caliper mount bolts have been removed, gently lift the
brake caliper
from the caliper mount. Inspect the caliper slides; they should move
freely in the
caliper mount. Remove rear brake pads and hardware.
With a socket wrench or other appropriate removal tool, loosen the
rear brake
caliper mounting bolts. Remove bolts and lift the caliper mount and
remove it from
the vehicle. Remove the retaining screw from the disc mounting hole. Tap
the rotor
gently to release any rust that has accumulated between the rotor and
bearing hub.
Lift brake rotor from wheel hub
holding on tightly, using both hands. You
do not want to drop the rotor. 
Remove the retaining screw from the disc mounting hole, tap the rotor
gently
to release any rust that has accumulated between the rotor and bearing
hub. Lift
brake rotor from wheel hub, hold
on using both hands and do not drop.
Check the new rotor against the old brake rotor to make sure they are
the same
size. Clean the mating surface on the wheel hub before the new brake
rotor is installed.
Reinstall rotor retainer screw.
Before new brake pads can be
installed, the rear brake caliper must be reset.
The reset tool winds the piston back into position so the new brake pads
will fit.
This style of brake caliper will not compress with a clamp tool; it can
only be
reset with the proper reset tool.
After the caliper has been reset, reinstall caliper mounting bolts
and make sure
the bolts are tight. Then match up the old brake pads to the new brake
pads. They
should be exactly the same except, of course; the old ones will be worn
out. Check
the new brake pads for proper fit and install any brake hardware that is
required.
Reinstall the brake caliper, align brake pad hardware and reinstall
caliper mounting
bolts. (Note: align the rear peg of the brake pad to the groove in the
caliper piston.)
Recheck and retighten all caliper and caliper mount bolts.
Bleed
brake system to relieve any air in the system. Before driving the
vehicle, push
the brake pedal down and let it up slowly. This operation forces the
brake pads
to travel to the brake rotors. DO NOT DRIVE
VEHICLE
until proper brake pedal
operation resumes.
When test driving vehicle listen for any unusual noises during the
operation of
the brakes.795 views
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