"clunk" under braking - BMW Luxury Touring Community
 
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post #1 of 6 Old Nov 6th, 2009, 2:38 am Thread Starter
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"clunk" under braking

There are tons of posts on the site (too may in fact) to help me look for a "clunk" from the front end under braking, but any advice would be appreciated.
It doesn't occur under light braking, but if I really pull on the front anchor, there's a "clunk" and at the same time a movement through the handlebars. It FEELS as if the steering head bearings are loose (i've only ever experienced that on a bicycle so I'm guessing here) but despite having had several LT's, I'm still not 100% sure if that part is the same as on "conventional" motorcycles.
The other day I put the bike on the centre stand, a jack under the engine to hold the front end off the floor and tried to pull the wheel in and out.......
I couldn't feel anything, but then again I wasn't trying too hard as I was very aware of 800lbs of bike just waiting to roll off the stand and squash me, so maybe didn't give if the full beans.
Discs, calipers and mudguard are all fine, nothing loose or moving excessively
Any advice greatly appreciated

Simon

ps, 1999, LT, 30,000 miles excellent well looked after condition

2006 k1200LT........my 13th!
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post #2 of 6 Old Nov 6th, 2009, 5:51 am
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Re: "clunk" under braking

I would take a gander at the front shock mounts (upper & lower), Simon. I can't think of other possibilities at the moment and hopefully, the experts will show up soon to help you out. Good luck.
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post #3 of 6 Old Nov 6th, 2009, 7:36 am
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Re: "clunk" under braking

I would check out the ball joint on the front A frame. I have seen a few of these come loose over the years.

Jim

Quote:
Originally Posted by simon
There are tons of posts on the site (too may in fact) to help me look for a "clunk" from the front end under braking, but any advice would be appreciated.
It doesn't occur under light braking, but if I really pull on the front anchor, there's a "clunk" and at the same time a movement through the handlebars. It FEELS as if the steering head bearings are loose (i've only ever experienced that on a bicycle so I'm guessing here) but despite having had several LT's, I'm still not 100% sure if that part is the same as on "conventional" motorcycles.
The other day I put the bike on the centre stand, a jack under the engine to hold the front end off the floor and tried to pull the wheel in and out.......
I couldn't feel anything, but then again I wasn't trying too hard as I was very aware of 800lbs of bike just waiting to roll off the stand and squash me, so maybe didn't give if the full beans.
Discs, calipers and mudguard are all fine, nothing loose or moving excessively
Any advice greatly appreciated

Simon

ps, 1999, LT, 30,000 miles excellent well looked after condition

Jim Davidson
2007 R1200RT
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post #4 of 6 Old Nov 6th, 2009, 8:15 am
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Re: "clunk" under braking

I am with Jim on this one. There are no "conventional" steering head bearings in this design. The lower ball joint is the prime suspect, however the top bearing assembly could also be at fault but it is difficult to see any movement up there. It is a press fit (into the top bridge) anular contact bearing that has a stud that bolts to the top of the frame. Have not seen one of those go bad - yet. The rear telelever bearings back over the center of the engine under the frame could also be worn. That would give lateral as well as longitudinal movement.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 6 Old Mar 6th, 2010, 12:52 pm Thread Starter
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Re: "clunk" under braking

Only just started riding the bike again and was still troubled by the "clunk"
However, had a decent look around and found the fork "bridge" loose! tightened up the bolts and all fine now! Strange the way this would have worked loose?

2006 k1200LT........my 13th!
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post #6 of 6 Old Mar 6th, 2010, 1:17 pm
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Re: "clunk" under braking

Quote:
Originally Posted by simon
Only just started riding the bike again and was still troubled by the "clunk"
However, had a decent look around and found the fork "bridge" loose! tightened up the bolts and all fine now! Strange the way this would have worked loose?
Someone else will probably also chime in, but those bolts should not come loose!

You may want to re-check them and make sure they were previously installed with Loctite... I'm not sure on the type - I used "blue" last time...

Gino
Modesto, CA
'02 Silver
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