Question about Volkswagen Passat

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How do you compress the piston in the rear caliper on a 2002 VW passat W8 moel.

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  • dchil577 Jul 27, 2008

    2002 VW Passat W8. I have the turn style pistons on the rear caliper. They will only go down a little and will not compress enough to allow new pads to fit. How do I compress them more.

  • dchil577 Jul 27, 2008

    Thank you j_del, you gave me the right advice unlike some of the others. It worked just forgot to take the cap off of the brake fluid. Now have spongy petal. Thanks.

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  • Master
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Hi On a VW PASSAT.
DON'T Hammered...
Just you need to turn with the Turn style tool. to push down the brake piston.
If is hard. Open a LITTE the BLEADER valve to to DROP a few of the brake fluid. Bucause if you force to much. The Brake master cylinder and ABS Module seals can be damaged.
Do a Little by Little. with the bleader valve open. is the right prosses to do that.
But don't forget That maybe your car Require DOT4. Don't put DOT3. is not the same.
I include a picture of your calliper. and the tool.

How do you compress the - e7ff765.jpg I hope this help on your problem.

Posted on Jul 27, 2008

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Your Passat has screw-in rear pistons. Only the fronts will compress. For the rears go to AutoZone and use their tool loan program. Leave a deposit at the counter and they'll loan you the piston kit that will allow you to twist the pistons back into the calipers. You'll want to remove the brake fluid reservoir cap before you do this, so that you're not fighting against the hydraulic pressure in the lines. Take the cap off, and size up the proper piston tool to the caliper pistons on your car. Use the kit to screw the pistons back into the caliper enough so you can fit the new pads over the rotor, replace the cap, and pump your brake pedal several times to reseat the pads against the rotor. Then you're done:)

Posted on Jul 27, 2008

  • Jeremy Dellow
    Jeremy Dellow Jul 28, 2008

    Glad to help - it always struck me as strange that VW/Audi chose to use compressible pistons on the front but screw-in on the rear. Seems more logical to choose one or the other for all four corners. But in any event, I'm glad it's taken care of and you're back on the road:)

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Get the Autozone tool that turns the piston clockwise then you can compress it and you'll be fine.

Hope that helps.....

Posted on Jul 27, 2008

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Wood block and a rubber hammer

Posted on Jul 27, 2008

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Use a hammer and a piece of wood, or use rubber hammer.

Posted on Jul 27, 2008

  • Ginko
    Ginko Jul 27, 2008

    This illustrated guide is on a Mazda, brakes are very similar to your Passat:


    HOWTO: Install Brake Pads, Rotors, and Lines


  • Ginko
    Ginko Jul 27, 2008

    The piston is usually hard to push back, push it back as suggested by voodoomox, that is standard solution, when it does not go back I use a wooden block same size as the piston, and I hammer it back with the rubber hammer.
    You can spill out some brake fluid pushing back the piston, do not forget to check and eventually top up brake fluid after replacing pads.
    Also pass a file on brake pads surface before putting them in place, this will help shaping brake pads for better adherence on the disk.
    Your brakes won't be fully efficient for some time after you replace pads, you have to wait until theyr surface get shaped with the disks.


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