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  1. #1
    Established Member Two Rings
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    Jul 18 2011
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    Norway

    Rear caliper piston not retracting

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    b6 s4 caliper, i pulled it out fine, but when trying to retract this bitch , the threaded cylinder inside the piston just spins.
    this is obviously so the piston dont spin under braking and warp the pads.
    is there a ghetto way to get this piston back into the caliper? apply force while turning the piston?
    pics 4 fun


  2. #2
    Veteran Member Three Rings b4a41point8t's Avatar
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    Jun 06 2009
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    B8 A4 2.0TQ
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    maybe dumb, or i dont understand, but are you using the correct tool? There are notches in the piston that must be spinned while retracting the piston. this only applies to the rear pistons. Are you trying to just spin it and attach by hand?

  3. #3
    Established Member Two Rings black2.7t's Avatar
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    Mar 07 2012
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    2003 Audi A4 1.8T - traded 2005 Cobalt SS - DD
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    just changed my rear pads the other day, you have to turn that piston clockwise to get it to go in. I used a c-clamp and channel locks to turn piston because i didnt have the proper tool lol
    03 A4 1.8T, silver/black, 5speed, Stage 1+ APR, gutted cat, APR Injectors, 6puck ACT unsprung clutch disc, light weight clutch masters flywheel, 034 street density tranny mount.

  4. #4
    Established Member Two Rings
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    Quote Originally Posted by black2.7t View Post
    just changed my rear pads the other day, you have to turn that piston clockwise to get it to go in. I used a c-clamp and channel locks to turn piston because i didnt have the proper tool lol
    I did turn the piston while retracting, it enters maybe one or two threads, then starts to spin.

  5. #5
    Established Member Two Rings black2.7t's Avatar
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    Mar 07 2012
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    2003 Audi A4 1.8T - traded 2005 Cobalt SS - DD
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    You may have to disconnect brake line so that there isn't any pressure.. but you'll have to bleed your brakes if you do that
    03 A4 1.8T, silver/black, 5speed, Stage 1+ APR, gutted cat, APR Injectors, 6puck ACT unsprung clutch disc, light weight clutch masters flywheel, 034 street density tranny mount.

  6. #6
    Established Member Two Rings
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    Quote Originally Posted by black2.7t View Post
    You may have to disconnect brake line so that there isn't any pressure.. but you'll have to bleed your brakes if you do that
    the calipers are fully taken apart as you van see in the pictures.

  7. #7
    Veteran Member Four Rings Kwarner's Avatar
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    Sep 06 2009
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    Bay Area
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    You need to apply a lot of pressure for it to go back in. If you haven't used the proper tool yet, it would probably do it.

  8. #8
    Veteran Member Three Rings b4a41point8t's Avatar
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    Quote Originally Posted by J_L View Post
    I did turn the piston while retracting, it enters maybe one or two threads, then starts to spin.
    U need the tool. Hand isn't strong enough.

  9. #9
    Established Member Two Rings
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    thanx for the help. no, i dont have the tool you mentioned, going to try again tomorrow, drink a big protein shake and apply some brute force

  10. #10
    Veteran Member Four Rings Militant-Grunt's Avatar
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    Oct 30 2006
    AZ Member #
    12999
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    04 USP A4 1.8t Avant
    Location
    NYC

    Well now that you took the piston out, you need a new inner seal and dust boot for the piston.

    Also need the screw type caliper compression tool, and also a lot of brake fluid, that piston will not go in easily unless you literally bathe it in brake fluid.

    Would be wise to look up how to rebuild single piston rear calipers, you can't just put the piston back in as it, it will leak.
    -MilitantGrunt- Audi USA. Certified Audi Technician
    -Brilliant Red B6 A4 Ultrasport 1.8t Avant

  11. #11
    Established Member Two Rings
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    Quote Originally Posted by Militant-Grunt View Post
    Well now that you took the piston out, you need a new inner seal and dust boot for the piston.

    Also need the screw type caliper compression tool, and also a lot of brake fluid, that piston will not go in easily unless you literally bathe it in brake fluid.

    Would be wise to look up how to rebuild single piston rear calipers, you can't just put the piston back in as it, it will leak.
    the front and rear calipers are going to get painted and have new seals, thats why it is apart at the moment- I have done this before, just not the rear one`s with the piston out of the caliper. I dont have a compression tool at the moment, but I can fab one up at work in the morning.
    thanx for the help though:)

  12. #12
    Established Member Two Rings shoemaker617's Avatar
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    Nov 15 2011
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    lol wow

  13. #13
    Established Member Two Rings
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    update: finished my front setup today, the rears just need some re-asembly after the paint.

    B6 s4 calipers with new seals, silver heat coating, Stoptec Possi-Quiet pads, Adams rotors drilled front/rear 340/300mm
    SS lines and Tyrolsport solid bushing kit:)








  14. #14
    Senior Member Four Rings customa4's Avatar
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    Apr 07 2011
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    02 A4 1.8T CVT, 02 A4 1.8TQ 5spd, 92 Geo Prizm
    Location
    CT

    Looks good! Let's see them on the car!

  15. #15
    Senior Member Four Rings Charles.waite's Avatar
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    Jun 27 2011
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    Seattle, WA
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    Quote Originally Posted by J_L View Post
    update: finished my front setup today, the rears just need some re-asembly after the paint.

    B6 s4 calipers with new seals, silver heat coating, Stoptec Possi-Quiet pads, Adams rotors drilled front/rear 340/300mm
    SS lines and Tyrolsport solid bushing kit:)







    Dude, that looks incredible. Its basically EXACTLY what I am planning on doing to my brakes. Any chance you could give me some tips, or a rough step by step, or at least the products you used to clean and prep the calipers for paint? I'm a bit of a noob when it comes to brake reconditioning.

    They really do look fantastic.
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  16. #16
    Veteran Member Three Rings dewey527's Avatar
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    Mar 10 2008
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    '02 a4 1.8tq, '05 tahoe
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    Great choice in caliper color. I did mine this past wknd in silver and waiting for the rotors to come in by friday (fingers crossed) Charles I spent 2 hours dremeling a caliper and then I should have proceeded directly to the ER due to not have a mask on and breathing all that friggin brake dust...F that, so I got a sandblasting kit and an hour later everything was done! No leaking seals so I didn't rebuild them. Three coats of duplicolor caliper paint and ready to go. Tyrol stiffening kit coming in and the power bleeder ready to go
    mods - not enough for me and way too many in my wife's opinion
    K04, Revo "Stg2", PODI Boost Gauge, TT225, fmic, Forge DV, Tantrumwerks 300cell HFC, Neuspeed Exhaust, Stasis Touring Suspension, Spec Stg2 & LWFW, 034 RSB, Neuspeed SS, Neuspeed Snub, Neuspeed TIP, B6S4 front brakes, Tyrolsport Kit, 6K HID, Yellow Fogs, 20%, CC

  17. #17
    Veteran Member Four Rings BARRY's Avatar
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    Nov 02 2007
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    i haven't looked at my bentley manual, but for my corolla if you disassembled the rear caliper you need a special service tool which compresses and locks down the internal nut below the piston.

    have you looked at a bentley manual yet?

  18. #18
    Veteran Member Four Rings waldo1324's Avatar
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    the Ghost of the Princess, 2007 Ford Fusion, 2006 Honda Accord
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    silver is sexy-- currently painting my spare front calipers red for the Zim drilled/ HPS/ SS lines swap. torn on whether to stop and go silver
    ""GHETTO MODIFIERS"" member #1
    The Princess: SOLD.. i love you, please forgive me


    "I agree with Waldo 100%" -1997GTX

    ..psst if you have a 2003+ 225 TT, email me..wally.iverson(at)gmail.com

  19. #19
    Senior Member Four Rings Charles.waite's Avatar
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    Quote Originally Posted by waldo1324 View Post
    silver is sexy-- currently painting my spare front calipers red for the Zim drilled/ HPS/ SS lines swap. torn on whether to stop and go silver
    Zebra stripe, red and silver. Or maybe one in red and one in silver.
    -CP
    USP CLUB MEMBER #136
    2004 A4 1.8TQ 6MT USP - APR Stage 1+ - FSI Coils - BKR7EIX-11 - 034 Rear Swaybar (Soft Setting) and Endlinks - B6S4 Front + B7A4 Rear Brakes - 034 Street Trans Mount
    2008 Brilliant Black Unicorn (2.0t S-Line Ti 6MT Avant) - Bosch FR6KPP332S
    SOLD -- 2006 A4 2.0TQ Avant Tiptronic

  20. #20
    Veteran Member Four Rings waldo1324's Avatar
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    the Ghost of the Princess, 2007 Ford Fusion, 2006 Honda Accord
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    Quote Originally Posted by Charles.waite View Post
    Zebra stripe, red and silver. Or maybe one in red and one in silver.
    holy shit charles , you just gave me the best idea-- silver carrier and red caliper! or vice versa
    ""GHETTO MODIFIERS"" member #1
    The Princess: SOLD.. i love you, please forgive me


    "I agree with Waldo 100%" -1997GTX

    ..psst if you have a 2003+ 225 TT, email me..wally.iverson(at)gmail.com

  21. #21
    Established Member Two Rings
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    here we go :)

    poss lookin oem brakes


    stock vs S4 (notice how the pads are the same size)




    installed


    I started at the rear, but the carrier bolts on the rear did not come out no matter what. I tried to heat it up with flames, and still no luck.
    so I started the fronts, and got`em done. Did a brake fluid change on the brake+ clutch system. next up was the brakes bed-in procedure:)

  22. #22
    Veteran Member Three Rings b4a41point8t's Avatar
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    Damn that looks great! Props!

  23. #23
    Veteran Member Three Rings 9744RR's Avatar
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    Great work for the OP and congrats on your new stopping power!

    This post may be too late for the OP but for the other newb's on AZ especially in North America who want to do the rears by themselves, buy one of these (click below) or something similar, it will make your life easier.

    http://www.rapidparts.com/prod/RP932...-Calipers/2664

    I have this same tool and paid $15 w/shipping years ago. The price now is ~$50. Happy
    Hers 2003 A4 1.8TQ TIP - GTRS Eliminator, REVO, Delphi 440's, ASP FMIC, Extreme TIP, Labree HFC, TT-DP, S4 door blades.
    2012 Mini Cooper - Stock


    Mine '64 Porshe 356, '12 A6 3.0T Prestige - stock

    Our Minivan has 240+ HP and its quicker than STG 1, 1+ A4's



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