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Discussion Starter #1
Just had my 2002 K1200LT brake flush performed at a BMW dealer. I was getting a intermittent brake fault and thought the brake flush might cure the problem. After the flush tech did pressure test and found low pressure front. He reset fault and it cleared. Tech took bike for test ride and said abs was working fine but when he got on brakes a fault came back in. Tech put bike on computer a again read low pressure fault front. At this point the service manager ask the tech to stop working on the bike since I had only authorized a brake flush. I rode the bike home from dealer and everything was fine. I have noticed since that time if I step on the rear brake really hard or squeeze the front brake really hard the red triangle comes on, but will go off after easing off on brakes. So my question is beside part # 34517685803 Pressure modulator which is the fully integral abs, is their any other thing to look at first? The reason I ask is the initial pressure test passes when first starting up. The fault will always reset on cycling the bike on an off. Is there a way to measure pressure at the pump itself, and if so what would a good reading be? Beyond the pump is the brake line and calibers. Inspected both and all seems. I have located a used pump off of a 2005 with only 14k and thinking about replacing mine with the used one. So quy's need advice as to what to check next or just go ahead and have pump replaced. New pump is $2498 used pump $1095. Also known good battery and fluid levels.

Thanks
Joe
 

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Howdy.. well.. ... I'd say brake line...as the line ages it breaks down internally and "balloons"... I would install the Speigler lines rather than "stock".... but YMMV (your mileage may vary)
 

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Discussion Starter #4
Dan,
Thanks for the information. The web site that listed the part had the right part number
34517685803. But when I asked the vendor what year the pump came from he said a 2005 which is part number 34517685788. So either the vendor has the wrong model year for the LT abs pump or he indeed has the right model year, but the wrong part number listed on his web site. Anyhow sent a e-mail off to the vendor to verify what part number he actually has.

Thanks
Joe
 

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Wrencher Extraordinaire
2005 K1200LT
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13,907 Posts
The biggest difference is the reservoirs are located ON the ABS pump on the 05 and up. The mounting orientation and location of the bleed ports are different as well.
 
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