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Thread: 2006 R1200RT ABS brake bleeding

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  1. #1
    kmkahuna
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    2006 R1200RT ABS brake bleeding

    I've checked the forum, but no one seems to have tackled this issue yet: As I was finishing up the big stuff on a 40km check (oil, final drive, transmission, spline lube, valve adjustment), I started going down the list and noticed the brake inspection. So, being the idealistic, naive mechanic I am, I thought "hey, I'll just bleed the old fluid out".
    You know the rest of the story....
    Even with an airtight seal on the caliper bleed valve, air is being sucked into the system somewhere...
    Now, the rear circuit of the ABS system is empty. How this happened is a mystery. Also a mystery is this: if you apply a vacuum on the rear caliper bleed valve, it's as if you're sucking on a straw: air just gets sucked all the way through the system. Where is this air coming from??? Why is a closed loop system allowing air into itself?
    Anyway, the handy CD ROM is out, and will bleed the ABS rear circuit, now that my beautiful bike is in pieces all over the garage: the tupperware, the fuel tank, etc...
    My question is: does this solve the problem? I will bleed out the ABS rear circuit per the instructions on the CD ROM, and do the same with the normal rear brake reservoir .. Also, is there a good homemade filler system that replaces that BMW specific attachment that goes on the ABS fill valve?

    BTW: the hexhead tech section is just awesome: all the other stuff went like clockwork thanks to this forum.
    I will try this procedure as my last gasp on trying to solve air in an ABS bike and if it doesn't work, I will cry uncle and bring in the calvary...at a BMW shop.

  2. #2
    Your use of "rear" confuses me as there are two rear circuits (wheel and control). Which were you trying to bleed? Also, you don't need to apply vacuum to the caliper. The electro-servo assist makes a wonderful pump.

    I'm wondering if you opened the rear reservoir for the control circuit then bled the caliper.

    If so all you did was bleed the wheel circuit reservoir that is part of the ABS unit dry.

  3. #3
    kmkahuna
    Guest
    Quote Originally Posted by marchyman View Post
    Your use of "rear" confuses me as there are two rear circuits (wheel and control). Which were you trying to bleed? Also, you don't need to apply vacuum to the caliper. The electro-servo assist makes a wonderful pump.

    I'm wondering if you opened the rear reservoir for the control circuit then bled the caliper.

    If so all you did was bleed the wheel circuit reservoir that is part of the ABS unit dry.
    I was trying to bleed the wheel circuit. Filled up the reservoir under the seat and opened the bleed valve on the caliper. Did I drain the control circuit as I pumped the rear pedal? I didn't mess with the control circuit at all; didn't fill it, or put fluid in it.

  4. #4
    John. jstrube's Avatar
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    You need to print this & take it with you to the garage. Follow it front to rear & you will be good!

    http://advwisdom.hogranch.com/Wisdom/service_abs3.pdf
    John.

  5. #5
    Registered User mpmarty's Avatar
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    +1 on John's post above. I did exactly that on my 06 and bled all per spec. No problems. You will need about 36 ounces of Dot 4 brake fluid (I used three 12oz cans).
    Last edited by MPMARTY; 04-29-2011 at 04:39 PM. Reason: punctuation
    Marty - in the western Oregon mountains.'06RT, (gone '04RT, '86 Venture Royal, '81 Yamaha Virago920, '82Suzuki GS1100GK, '76 Suzuki GT750, Triumph 750 Bonneville, BSA Road Rocket 650, 61" Harley knucklehead)

  6. #6
    What John said, except after cleaning and pushing the caliper pistons into the caliper I use some shims between the brake pads instead of replacing the pads with custom hardwood spacers used in the referenced document.

    No need to pump. Light pressure on the brake pedal will cause the servo to come on. A little more pressure will cause fluid to start moving. Fluid will move as long as that pressure is maintained. Keep your eye on the funnel (I assume you're using a funnel) and close the bleed valve while you still see some brake fluid. I use a syringe to suck out excess fluid before removing the funnel.

  7. #7
    Registered User mpmarty's Avatar
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    I use two turkey basters (clean and dirty) for fluid removal per the instructions. Use a glass turkey baster if possible to avoid problems with brake fluid attacking the baster tube.
    Marty - in the western Oregon mountains.'06RT, (gone '04RT, '86 Venture Royal, '81 Yamaha Virago920, '82Suzuki GS1100GK, '76 Suzuki GT750, Triumph 750 Bonneville, BSA Road Rocket 650, 61" Harley knucklehead)

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