Brake Flush 06 K1200s - - Excellence in Motion
  • 1 Post By Patrique83
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post #1 of 4 (permalink) Old Sep 9th, 2014, 8:10 pm Thread Starter
Join Date: Nov 2007
Location: Irvine, CA, USA
Posts: 29
Brake Flush 06 K1200s

I recently flushed my brake fluid for the first time on my bike. I had been ignoring the dealer advice to flush it every two years for $350 plus.

Finally dealer said that he was pretty sure that when they flushed it that I would need to change the servo motor at a cost of 1800 parts plus labor. I was lucky enough to see the tech bleed another bikes servo which did turn out bad a did need a replacement servo.

There is a link on this site that shows the dealers method to bleed the servo. I think the dealers method is the very thing that causes the servos to fail. Dealer does pay for a servo that fails so it has no incentive to change its procedures.

Specifically the dealer will bleed the wheel circuits of the servo by running the servo's motors to force the fluids out past the wheel cylinders. I know from bleeding brakes on anything else that you do not want to run the master cylinder past it's normal range because the seals will get destroyed when they run across the corroded metal in the master cylinder. This will require a new master cylinder.

I therefore vacuum pumped the old fluid out of the servo. This ensured I would not ruin the seals running the servo motors . After I had clear clean fluid coming out of the wheel cylinders I closed the system and everything works fine 4 months later and 5000 miles.

I feel certain that permitting the dealer to do the job would have cost me a new servo.

Moral of the story - Don't let dealer bleed system unless you do it faithfully every other year. Otherwise vacuum bleed the servo to protect the seals and keep your money in your wallet
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post #2 of 4 (permalink) Old Sep 16th, 2014, 6:29 am
Join Date: Feb 2013
Location: Vancouver, WA, USA
Posts: 7
I just had to replace the ABS pump with under 16,000 miles on the clock for over $2,000 bucks. My dealer tells me to flush the brakes every year will help keep it working.
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post #3 of 4 (permalink) Old Jun 1st, 2017, 4:45 pm
Join Date: Mar 2017
Posts: 15
I am fixing to do this so I want to get it straight. You say there are three bleed valves on the servo that you bleed first, then you go to the brake calipers and bleed there also. Mine is a 2005, if that makes a difference
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post #4 of 4 (permalink) Old Jun 2nd, 2017, 3:54 am
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Join Date: Apr 2017
Posts: 57
Use this bleed procedure. I have used it many times on my 1150RT and on my 05 K1200s Servo Brake.

You will need a funnel to keep the ABS Servo reservoir full while bleeding so that you don't suck air into the system.
I bought a 2 dollar funnel and used a water tap seal from the hardware store.
Superglue the rubber seal on to the funnel and you are good to go.
The seal is about a 3/4inch or 20mm diameter.
And buy yourself a couple of feet of clear hose.....Makes the job less messy.

Make sure you know which bleed nipple is for what circuit..... I mistakenly was opening the rear nipples and was wondering why there is no fluid coming out when pumping the handlever.

And here are a few tips:
Buy Bendix DOT4 Brake fluid. Its blue in color and you can then see if you have pushed all the old fluid out. Next time use clear brake fluid again.....

Don't turn the ignition on when doing the "Control circuits". No need to have the pumps running. Just gently push the fluid through and keep topping up the reservoirs (Handle bar / rear brake).

When doing the brake circuit, insert the funnel into the ABS unit reservoir and fill it to the top.
(Might be easier with two people)
Turn the ignition on
Then, pull on the lever until the Microswitch turns the Servo pumps on and hold it there. No need to pump on the lever, just let the pumps run.....
The Servo Pumps are then going to slowly.....and I mean really slowly.....draw the fluid out of the funnel and push it through the brake lines to the calipers/bleed nipple.
Do the front left caliper first, don't know why but thats what BMW says in the maintenance manual. Then do the right.

And you are supposed to push the pistons back into the calipers and hold them there.....I never did, and it always worked for me.

Pretty straight forward job.....if you know what you are doing. HAHA
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