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Whitefire

Joined:

Sep 12

Posts: 4

Whitefire says:

Brake Failure

I have recently purchased a 2007 BMW K1200 GT and occasionaly the  front brake will not work, the brake lever when applied appears to have no resistance, on the second pump everything is ok and the brakes work fine.(Till it happens again) At first there were no warning signs appearing on my display, but on the way to garage the "Brake Failure" message appeared, I put this down to the brake pads being worn but changing them has not cured the problem. The BMW garage say it is the ABS Modulator but are not certain, any ideas? My main concern is that I cannot tell when they are going to "Not Work" on the first pull.

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  • Posted 2 years ago (29 September 2012 20:41)

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philehidiot

Joined:

Feb 09

Posts: 4741

philehidiot says:

They

don't feel spongy or anything do they? I've no idea about the ABS side of things but if you have air in the system it could possibly behave like this, requiring a pump of the brake lever to get the brakes to work. I also take it the fluid levels are fine?


I'm pretty shit (in general) so do wait for replies from proper people before running off to drain your brake fluid.

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fogie

Joined:

Jan 04

Posts: 835

fogie says:

brake failure

I've heard of this somewhere, but can't remember where.This site wouldn't let me do a link???? so, search for bmw k1200 brake failure  :wink:

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albert88

Joined:

Jan 10

Posts: 1663

albert88 says:

brakes

as a rule if the ABS pump/modulator fails the brake system 'should' revert to a standard brake system , if you have to 'pump' the lever it sounds like air in the system but i would advise you get it checked out before you hurt yoursen bud.

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Whitefire

Joined:

Sep 12

Posts: 4

Whitefire says:

Brake failure

Surfed the net looking to see if it had happened before, all I seem to find is complaints about warning lights coming on, I have not come across any mention of the brakes not actually working on the first squeeze of the lever.

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bbstrikesagain

Joined:

Nov 08

Posts: 879

Disc / wheel movement?

A warped disc, or one that occasionally gets disturbed on its floaters (e.g. while parked, having tyres changed etc) could push the pads back requiring a pump or two before they work.  Similarly a failing wheel bearing might have a similar effect.


You say on occasion - what occasion: start of ride, mid ride, or related to something, like after a long stretch with no braking?  It doesn't sound like air in the lines, but then again I've never had a beemer.

Worrying thing about ABS is the modulator - contains valves to release pressure, relying on the pump to put it back.  If the bypass valve didn't seat right, or was slightly contaminated, could that cause cause your symptom, with your pumping building a bit of pressure to seat it again?  Whatever, the ABS ECU won't always know if something's up with the hydraulics...

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jaffa90

Joined:

Mar 09

Posts: 8892

jaffa90 says:

brake failure

Don`t have any info on your bike but taking in albert88 (getting old now) and bbstrikesagain replies,is it possible to disconnect the a.b.s. to see if the master cylinder piston seals are knackered?

I hope there isn`t to much fluid in the master cylinder.

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kcmc

Joined:

Jan 08

Posts: 7417

kcmc says:

BMW K1200 GT 2007

Hi Whitefire and welcome to the site:smile

If this is happening while riding with no other problems,like a pumping lever,then i would have to go with Jaffa90 ,Front Master cylinder seal failure starting to occur,probably due to fluid contamination?.Good Luck.

KCMC:tongue: 

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smidget

Joined:

Nov 07

Posts: 2419

smidget says:

Just

to add to what the other posters have already said,

Do you know if the brake fluid has ever been renewed?

Have the calipers been serviced / refurbished?

Is the handlebar lever and its pivot bolt in good condition or are they worn allowing excessive travel?

 

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Whitefire

Joined:

Sep 12

Posts: 4

Whitefire says:

Brake Failure

Thanks for all of the replies, The second pump can be required almost anytime, it happened after a run but the brake had been used a few times before that and worked ok, it has happened during a run just before a corner and actually happened at the BMW garage as the technician was taking it into the workshop, there appears to be no set pattern to it.

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jaffa90

Joined:

Mar 09

Posts: 8892

jaffa90 says:

brake failure

as my first post:blink:,

you no reply. 

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