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A "C" clamp slowly screwed in should do it. Put screw end inside cup (piston) . I also use a wooden handle of a hammer to push inside cup. Wedge caliper against something solid, and push hard with hammer handle inside caliper piston. Hard and steady, it should slowly go. If not , crack bleeder screw slightly, just remember to bleed after installed.
Replacing brake pads or rotors does not need to be difficult if you
have the right tools. Volkswagen and Audi rear calipers require that
the piston be rotated while being pushed back into the caliper.
the piston screws back. you can buy a tool at an auto parts place for a few dollars. it's a small cube shaped tool with various spaced nubs on each side for multiple vehicle use
this is because these calipers have what they call ratcheting pistons, you must turn the piston and depress it at the same time to draw the piston back inside the housing, there is a specialty tool made especially for these type of brake systems and sears roebuck actually stocks these kits.they run about forty US dolllars.Hope I could help!!!
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.
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.
hi from uk the rear brake calipers are auto adjust and so to reset the pistons back into calipers you need to rewind clockwise the piston whilst pushing piston back there is a tool for this purpose which does job in minutes however!! you can improvise if you have an old socket and hacksaw ? you can look at piston and see there are two slots on it? if you cut away an old socket so left with prongs to fit these slots then fit t bar and short extension to socket then you can push and turn piston back make sure slots are in line as to able fitting of new pads one has notch on rear face to insert in piston slot this also works for other models with rear calipers ? cheaper than the tool at £40 to £60 inthe uk dependant on makers hope this helps/inspires you ?
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