R90S ATE caliper rebuild

Discussion in 'Airheads' started by craydds, Nov 12, 2011.

  1. craydds

    craydds Long timer

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    Buy a grease zerk with the M10 x 1.0 threads. see http://www.mcmaster.com/#zerk-grease-fittings/=h3u0qv . These thread into the caliper. Use the bleeder valve to block one hole, screw the grease zerk into the other and pump away.
  2. knary

    knary sunshine and puppies

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    the el cheapo grease guns I've owned screw right in after you remove the zerk fitting bit on the end.
  3. Fritzie

    Fritzie n00b

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    Thanks guys, super helpful.
  4. supershaft

    supershaft because I can

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    The last time I did it just recently on a RD 350 caliper I just stuck my grease needle in the loose bleeder real hard and started pumping. Sure a bit backed out around the needle but most all of the grease forced the piston out. Both ways definitely work. Good luck!
  5. craydds

    craydds Long timer

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    Here is the 14 mm MC. I bought it from Max BMW, part # 32-72-2-310-747 , http://www.maxbmwmotorcycles.com/fiche/PartsSearch.aspx?parts=32722310747
    [​IMG]

    I use Earl's Speed Flex size 3 hose from ANplumbing.com, http://www.anplumbing.com/Hose/Speed-Flex-43.html
    [​IMG]

    I used Earl's Speed Seal fittings, http://www.anplumbing.com/Hose+Ends/Speed+Seal+S.S-35.html .
    [​IMG]

    One line from MC down to right caliper. The second line goes from the right caliper, over the fender to the left caliper.
    [​IMG]

    brake lines
    [​IMG]

    Left caliper with Earl's SOLO BLEED bleeder valve, http://www.anplumbing.com/Extras/Breathers+|+Bleeders-64.html, above the Speed Seal fitting part #600493.
    [​IMG]
  6. supershaft

    supershaft because I can

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    That's one way of doing it. I always run a double banjo bolt on the first caliper and keep the bleeder.
  7. craydds

    craydds Long timer

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  8. craydds

    craydds Long timer

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    I thought about that, too. Thought that might be easier to bleed. Left myself enough slack in the brake line to change it if necessary. Turns out my set-up was relatively easy to bleed.
  9. Fritzie

    Fritzie n00b

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    I soaked the stuck caliper in diesel for 3 days and compressed air brought the bad guy right out. It's toast. Calipers are rebuilt and waiting on new lines. What pads are you guys using ?
  10. craydds

    craydds Long timer

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  11. craydds

    craydds Long timer

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  12. surtees

    surtees Adventurer

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    Looks great Ray, very clean and simple. I used the same MC - when I first filled and bled it I saw swirls of the fluid turn dark in the MC reservoir (I had it open to check the level) - seemed like maybe there was some oil or gasket material left in there. Did you notice that? I also use the EBC pads and like them.
    surtees
  13. craydds

    craydds Long timer

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    Yes! That worried me, but I kept flushing/bleeding the entire system until clear brake fluid was flowing out. I might flush the system again after a few months. Brake fluid is cheap. We have heard about rust/corrosion in the calipers and MC's on this and several other threads. Fellow inmates, flush the system at least once yearly.
  14. craydds

    craydds Long timer

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    What happened to my pictures?
  15. gasolinePony

    gasolinePony Adventurer

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    Hi, Craydds, great info here, thanks. I'm looking at some of that surface rust in the piston bore (piston itself I've already ordered). Would you recommend wax metallic finish to remove it?

    Pictured here: http://advrider.com/forums/showthread.php?t=795953&page=2#30

    Thanks for any help.
  16. craydds

    craydds Long timer

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    It is easy to clean the piston bore with a good scrubbing; scotchbrite, as you mentioned, with detergent should work well. A bit of phosphoric rust remover couldn't hurt, but don't leave it in contact with the surface for too long. Thorough rinsing and drying should do the trick. Any product/cleaner/etc. must be completely rinsed away so as not to interfere with the brake fluid. Good luck!
  17. sigpe57

    sigpe57 Been here awhile

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    Are there after-market dust boot and seal kit or just by from the BMW Dealer?

    Where is the best place to buy?
  18. craydds

    craydds Long timer

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    No aftermarket seal/dust boot kit that I know of, but several of the parts suppliers carry these items. Where are you located - have a local shop in your area? You might give Ted Porter a call, http://beemershop.com/Merchant5/merchant.mvc?Store_Code=BS&Screen=PLST . Do you have 40 mm or 38 mm ATE's?
  19. sigpe57

    sigpe57 Been here awhile

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    Good question, I don't know it's 38 or 40mm. How do I check?

    I'm in Los Angeles. Few BMW dealers here.
  20. Kai Ju

    Kai Ju Long timer

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    The number is stamped on the outside of the caliper.

    Re dealers in LA, there is Long Beach BMW, Irv Seavers ( my choice since they usually have what I need in stock ), BMW of Hollywood, BMW of Ventura County, BMW of Riverside, or let google be your friend: http://tinyurl.com/ao53k85