2007 K1200S, brake problems? - K-Bikes.com - Excellence in Motion
 
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post #1 of 9 (permalink) Old Apr 10th, 2012, 3:49 pm Thread Starter
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2007 K1200S, brake problems?

Hi all-
My buddy just bought a 2007 k1200S. He thinks the brakes are bad, and I'm curious if anyone here has had similar experiences.
He says that he has to squeeze the lever very hard to get any performance out of the brakes, and/or also has to use the rear pedal to increase his braking force. This bike has servo brakes, BTW.
We've hooked it up to a GS-911 and didn't see any brake faults. He has also installed a new battery (it was stock from '07, and very weak) which didn't change anything. I mention this because I've read in these threads that heavy braking draws a lot from the battery with servo brakes.
I also read that the rear pedal issue can cause the startup sequence to complete improperly, shutting down the booster. So I told him to have a look there.
I also told him to start the bike and squat next to it while squeezing the brake lever. He should hear the booster whining. I want him to be right next to it because the bike came with a Remus exhaust with the sound insert missing, so it's freakishly loud (we're addressing this also). If there's no booster whine, maybe something is disconnected or failed. I looked at it when he first bought it and noticed that with the bike off, the brake lever seemed a little "spongy" and it made some noises that to me sounded like a possible air bubble in the brake circuit.
Anyone else have any ideas on what the problem might be?
The bike is an '07 with only 2400 miles on it, meaning it spent a lot of time sitting. Everything else on the bike is perfect. I rode it briefly around his house, but only at low speed. In this case, the brakes seemed fine to me (compared to my '08 GT). But he says the brakes are weak stopping from greater speeds.
We are getting together again in a few days, and I'll be able to give it a better look. We need to clear the faults left behind from changing the battery, and then we plan to ride for a few hours and check it again to see if anything pops up.

Any other ideas from the community would sure be helpful.
Thanks, folks!
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post #2 of 9 (permalink) Old Apr 12th, 2012, 8:43 pm
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So did you guys get it worked out? I don't know the ins and outs of the system on the 07, but my understanding, and experience, is that the brakes on these bikes are waaay good. So, something must be amis, you may need to do a bleed or take it to the dealer for assistance....let us know what you find...

Jim Douglas
'00 K1200RS >135,000 mi, '09 K1300S sold @ 22,232 mi
'93 K1100RS traded up @ 78,000 mi, '85 K100RS sold @44,000 mi, Kawi 650 track bike - sold
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post #3 of 9 (permalink) Old Apr 13th, 2012, 11:17 am
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Quote:
Originally Posted by robday
Hi all-
We've hooked it up to a GS-911 and didn't see any brake faults. He has also installed a new battery (it was stock from '07, and very weak) which didn't change anything. I mention this because I've read in these threads that heavy braking draws a lot from the battery with servo brakes.
Don't know much about that braking system but doesn't the GS911 now have the "Brake pressure/Bleed test" for them bikes in the new Beta software that just came out, January 31st 2012 ????

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post #4 of 9 (permalink) Old Apr 23rd, 2012, 9:45 am
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Something is definately wrong. The 07 S has some of the best brakes you can get on a MC. I never touch the rear brake. The linked brakes work perfectly, at all speeds. I ride faster than most and brake hard. I'm on my second 07 K1200S, and have nothing but praise for the brakes. Sounds like they need bleeding. I'd try a second source to check them out.
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post #5 of 9 (permalink) Old Apr 25th, 2012, 1:38 pm
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You should be able to hear the booster whining noise with the key on and the bike not running.

James

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post #6 of 9 (permalink) Old Jun 14th, 2012, 9:46 am
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2007 model S bikes did not have "servo" brake assist. The whinning you're hearing is coming from something else. The brake issue sounds like they need bleeding. I'd refill and power bleed at a dealer.
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post #7 of 9 (permalink) Old Jun 15th, 2012, 8:18 pm
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i've also think I have a break problem

It feels like my front rotors are very warped. I asked my dealer at my last service and they dismissed it saying they didn't notice it. Well maybe it's gotten worse because I certainly notice it and I know feel another problem. When slowing down I am feeling a rubbing or thumping from the wheels even when I'm not on the brakes. I'm wondering if warped rotors would create a modulating drag even when not on the brakes.

Thanks for any help.
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post #8 of 9 (permalink) Old Jun 17th, 2012, 11:26 am
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Quote:
Originally Posted by shootersteve77
It feels like my front rotors are very warped. I asked my dealer at my last service and they dismissed it saying they didn't notice it. Well maybe it's gotten worse because I certainly notice it and I know feel another problem. When slowing down I am feeling a rubbing or thumping from the wheels even when I'm not on the brakes. I'm wondering if warped rotors would create a modulating drag even when not on the brakes.

Thanks for any help.
What year (sorry, guess I should be able to tell from the pic). In 2006 (and maybe before) there was a general recall which, on "certain models", included replacing brake dics. I didn't think this was an 'S' issue... but who knows? In 2008 there was another brake recall. This one dealing with disc mounting bolts failing. Go here and enter your bike on the upper right, then drill down: www.safercar.gov
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post #9 of 9 (permalink) Old Jun 29th, 2012, 12:58 am
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I am a little late reading this.
I would check pads, if they are worn unevenly you have sticky pistons in your brake calipers. There is a big issue with this, the dealers are NOT changing brake fluid as part of regular maintenance. But BMW says do it every 24K or 12 mo. The brake fluid contaminates easily and can trash the servo pump if left contaminated.

Braking taking a lot of pressure at the handlebar? $3,000 US for a new pump and full brake job. Pulsing and chattering, uneven brake wear? You may be able to salvage things with just a good flush as per BMW. The procedure is not trivial.
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