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Thread: Brake reservoir empty 06 RT

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  1. #1
    Registered User C172MyP51's Avatar
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    Brake reservoir empty 06 RT

    Had the bike parked on the center stand, turned the handlebars both ways & I can't see anything in the brake fluid sight "glass" which is on the reservoir on the throttle side, I believe.
    A. Is it as easy as removing the reservoir cover carefully, wiping everything off, keeping the fluid off the plastic etc. and topping it off? I've got a bottle of brake fluid from the dealer.
    B. Has anyone ever run out before? What's it mean?

    Thanks!
    -Scott
    Hershey, PA
    IBA# 41,645
    2006 BMW R1200RT "Pacific Coast II"

  2. #2
    Registered User mpmarty's Avatar
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    Probably means nothing at all. As your pads wear down the level drops in the fluid cup. Don't fill it up as when you replace the disk pads it will be a problem. I'd wipe the top off and remove it to see how much fluid is there.
    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)

  3. #3
    Curmudgeon At Large Bobmws's Avatar
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    Yes, it is that easy. You may want to check the thickness of your front brake pads. If the fluid has dropped that far you may be at the service limit.
    Bob Weis
    '04 K12RS - Hannigan Hack
    www.earplugco.com

  4. #4
    Registered User Jim Rogers's Avatar
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    As MPMARTY says, your situation may just be due to brake pad wear. Consider looking at the wear of the front brake pads. (The RiderÔÇÖs Manual should be a source of information on how to do this.) Does the amount of wear equate to the amount of decrease of fluid in the reservoir? Are the pads worn to the point of needing replacement? Do the brakes feel ÔÇÿspongyÔÇÖ? Is the level low enough to warrant doing a brake bleed/flush?

    On the other hand, since the vast majority of stopping power comes from the front brakes, it might be prudent to do just a bit more than put more fluid in. While it may be due to pad wear, consider carefully inspecting for signs of leaks. This might include looking on the deck under where the bike is parked, but may also included looking along the entire brake line circuit including all hoses and joints. (The fiche from Max BMW (http://www.maxbmwmotorcycles.com/fic...0&rnd=08102012) will provide good drawings to assist in this inspection.) Any signs of fluid/moisture should be considered suspect and further investigated. In addition to this initial visual inspection, consider repeating it once fluid has been added with the system under pressure by applying the brake with the bike on/running to ensure the ABS system is functioning. If a leak does exist, it will be more evident with the system under pressure. Also consider if there is a leak and it occurred while riding, there may be little, if any, evidence actually on the bike as any fluid that may have leaked out was ÔÇÿblown awayÔÇÖ and not on the bike at all.

    See this thread for what I recently went through with my rear brake on my ÔÇÖ10 GSA -
    http://www.bmwmoa.org/forum/showthre...sa+rear+brakes
    Gear Up and Ride Safe
    Jim Rogers
    2010 R12GSA aka Heidi
    Yorktown, Va

  5. #5
    Registered User
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    Inner pads wear faster- be sure to look at those

    There is in additional to the window a lttle level fill indicator ridge or notch cast inside the reservoir on those Magura controls you can use to tell fill level when open.

    If the rservoir top doesn't come off easily, slide a piece of thin dental floss into the joint and work it around the periphery to loosen the top. No prying with a crewdriver or knife is needed.

  6. #6
    Registered User
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    For the 06 models there are 2 brake circuits each for the front and rear brakes: a control circuit (master cylinder to ABS controller) and a power circuit (ABS controller to caliper(s)). Fluid level in the master cylinders is not dependent on pad wear. The OP could have a leak in the front brake control circuit.
    Karl
    2007 R1200ST

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