confused on lt brake rotors - BMW Luxury Touring Community
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post #1 of 10 Old Oct 24th, 2016, 4:21 pm Thread Starter
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confused on lt brake rotors

Well again i'm confused. I see various posts and specs on the web stating that the K1200lt has twin front FLOATING disks. I just did a tire change and brake pad replacement on my 2006 k1200lt, and Those disks don't look like any FLOATING disks i've ever seen.. Am I missing something.. They look like they are fixed with torx bolts torqued to 21nm.


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Joe
Palm Coast, FL.

2006 K1200LT (Love it)
2002 R1150RT (Sold)
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1999 Harley Night train (blew the eng at 150k miles)
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post #2 of 10 Old Oct 24th, 2016, 5:19 pm
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Re: confused on lt brake rotors

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Originally Posted by BeemerJoe View Post
Well again i'm confused. I see various posts and specs on the web stating that the K1200lt has twin front FLOATING disks. I just did a tire change and brake pad replacement on my 2006 k1200lt, and Those disks don't look like any FLOATING disks i've ever seen.. Am I missing something.. They look like they are fixed with torx bolts torqued to 21nm.
There is supposed to be a wave washer between the roll pin and the rotor or the sensor ring depending on what side you are looking at which allows the rotor to flex left and right a small amount. The torx screw should bottom out without binding on the rotor itself but slightly compress the wave washer.
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Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #3 of 10 Old Oct 24th, 2016, 5:25 pm Thread Starter
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Re: confused on lt brake rotors

i see that, but there is absolutely no movement in the rotor from what i can tell.. FYI, i just did a tire change and removed the rotors so as not to damage them when working on the tire. I reinstalled them and double and triple checked the installation and placement of all the washers.. but absolutely no movement at all.. Should i be able to feel them move.. What brought this up, is that with the new tires, i feel a definite abs wobble on hard breaking. folks on here say it's normal, but didn't happen with my "almost" bald tire.


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Joe
Palm Coast, FL.

2006 K1200LT (Love it)
2002 R1150RT (Sold)
2007 Harley FLHTCU (sold at 137k Miles)
1999 Harley Night train (blew the eng at 150k miles)
1986 harley Davidson FLTC (Sold When assigned to Europe
1982 Harley Wide Glide (sold)
1981 Kawasaki k1000LTD (sold)
1980 Triumph Bonneville (sold)
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post #4 of 10 Old Oct 24th, 2016, 5:42 pm
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Re: confused on lt brake rotors

A wobble of any kind is NOT a normal condition, yes it happens sometimes when tyres are worn or changed, the rotor movement is very slight but you can detect/feel it by hand. As Gordon said make sure all the wave washers are fitted correctly, I suppose you marked the rotors and refitted them on the same place and side of the rim as they were originally fitted?. if not then that could be the problem.

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post #5 of 10 Old Oct 24th, 2016, 5:45 pm
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Re: confused on lt brake rotors

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Originally Posted by BeemerJoe View Post
i see that, but there is absolutely no movement in the rotor from what i can tell.. FYI, i just did a tire change and removed the rotors so as not to damage them when working on the tire. I reinstalled them and double and triple checked the installation and placement of all the washers.. but absolutely no movement at all.. Should i be able to feel them move.. What brought this up, is that with the new tires, i feel a definite abs wobble on hard breaking. folks on here say it's normal, but didn't happen with my "almost" bald tire.
I have a new to me wheel set that I just replaced the rotors on but didn't take them off prior to replacing the wheel bearings so I may have bent one a little and I also have a brake judder as one seems to be warped. I have not troubleshot this yet so it is possible i have a bent one or have something ( dirt) under one of the rotors making them out of round so to speak. I put a new tire on my old rim and put everything back and and no judder on the old one.

Can I assume you marked the sides and the rotation direction prior to replacing the rotors?

I am going to set my spare wheel on my balancer stand with a truing pointer and see if I can see which rotor on mine is causing the issue and at what point it is so I can examine the seating surface and roll pin to make sure I don't have anything extra causing a bind. The rotors do not flop around but will flex against the wave washer. I suspect something is a little off with your reassembly but since I had something similar, I am not sure what yet.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #6 of 10 Old Oct 24th, 2016, 8:05 pm
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Re: confused on lt brake rotors

There is some movement but only about 0.010 ". You most likely will not see that without a dial indicator. There zero float in the calipers.
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John
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post #7 of 10 Old Oct 25th, 2016, 8:12 am Thread Starter
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Re: confused on lt brake rotors

Thanks JZEILER. .010"!!!!! That explains it. I couldn't feel any movement by grabbing it. I'm used to the floating disks used on some Harleys. You could actually see and feel them moving.


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Palm Coast, FL.

2006 K1200LT (Love it)
2002 R1150RT (Sold)
2007 Harley FLHTCU (sold at 137k Miles)
1999 Harley Night train (blew the eng at 150k miles)
1986 harley Davidson FLTC (Sold When assigned to Europe
1982 Harley Wide Glide (sold)
1981 Kawasaki k1000LTD (sold)
1980 Triumph Bonneville (sold)
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post #8 of 10 Old Oct 25th, 2016, 8:18 am
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Re: confused on lt brake rotors

What are the implications if there is greater than .01" of movement in the rotors? Replace the wave washers?

Rob, 2000LT
Navarre, FL
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post #9 of 10 Old Oct 25th, 2016, 9:38 am
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Re: confused on lt brake rotors

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What are the implications if there is greater than .01" of movement in the rotors? Replace the wave washers?

Rob, 2000LT
Navarre, FL
Rob, you could try that and see if it makes any difference. Your other recent thread sounds like they are a bit floppy and that shouldn't be unless something is badly worn or someone put the wrong hardware on it. If they are lose, then they might rattle some. Have you checked to see if the wave washers are present in your assembly yet? There is loctite on these bolts so make sure and use heat to remove them if you go to inspect.

PS, if someone overheated the wave washers in removal, they may have lost their temper and are no longer providing proper spring tension.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #10 of 10 Old Oct 25th, 2016, 10:08 pm
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Re: confused on lt brake rotors

0.010" was actually measured on my 05 LT and the rotors have never been off. I also have over 100 K on the original front pads (I usually use engine braking most of the time unless I really need to stop in a hurry).

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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