ABS Gap Spec. for 1999LT - BMW Luxury Touring Community
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post #1 of 5 Old Mar 25th, 2020, 7:49 am Thread Starter
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ABS Gap Spec. for 1999LT

Hi,

My bike says the spec for the gap between the ABS sensor and the teeth on the ABS rotor teeth? (sorry I am a newbie at this), should be .45 and .55mm. I am getting a range more like .25 and .45 as I spin the rear wheel and check different locations.

I read one old thread that suggests the spec is much wider? i.e the tolerances are not that critical?

What should I consider a minimum spec for these gaps, and when should I add additional shim(s)?

Appreciate the help.
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post #2 of 5 Old Mar 25th, 2020, 8:18 am
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Re: ABS Gap Spec. for 1999LT

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Originally Posted by RABlvmy88 View Post
Hi,

My bike says the spec for the gap between the ABS sensor and the teeth on the ABS rotor teeth? (sorry I am a newbie at this), should be .45 and .55mm. I am getting a range more like .25 and .45 as I spin the rear wheel and check different locations.

I read one old thread that suggests the spec is much wider? i.e the tolerances are not that critical?

What should I consider a minimum spec for these gaps, and when should I add additional shim(s)?

Appreciate the help.
First thing I have to say is welcome as you have a very low post number but have been here since 2015, just mostly quiet. Second thing is, are you trying to fix something that isn't broken? Your measurements are close enough to spec and as long as the ring isn't hitting the sensor and you have no ABS error, I would just leave it alone and not get too worked up over it. There is going to be some variance around the ring. If you start having errors associated with sensors, then I would look at getting a shim if necessary and working the problem. Till then, if it is not flashing at you, you are wasting time not riding
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2001 K1200LTI – Champagne (current ride) Lazy Susan
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post #3 of 5 Old Mar 25th, 2020, 8:22 am
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Re: ABS Gap Spec. for 1999LT

Quote:
Originally Posted by RABlvmy88 View Post
Hi,

My bike says the spec for the gap between the ABS sensor and the teeth on the ABS rotor teeth? (sorry I am a newbie at this), should be .45 and .55mm. I am getting a range more like .25 and .45 as I spin the rear wheel and check different locations.

I read one old thread that suggests the spec is much wider? i.e the tolerances are not that critical?

What should I consider a minimum spec for these gaps, and when should I add additional shim(s)?

Appreciate the help.
For the 1st generation like yours having the older ABS2 system (1999-2001 in USA) , the specs are quite strict. The values you posted above are correct.

Although I have done a few thickness tests with the next generation having ABS with servos to see how tolerant it was outside of normal specs, I have never done the same for ABS2. If you do not see any ABS warnings on dash while riding, then my best guess is you are OK. Ideally, if you can have access to a GS911, you could read the ABS system fault codes (if any).

If you have a slightly out-of-round dented wheel (where the ABS sensor read pulses), then of course you may have difficulty to stay within specs all around. You should check at least 4 spots at 90 degree intervalls. Did you remove the rear wheel to check if the rear brake rotor is solid on the rear drive ?? If the 2 counter-sunk screws holding the rotor to rear drive are not properly torqued down, I suspect it might be possible to have a slight movement of the rotor when the Rim is torqued down.
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Last edited by sailor; Mar 25th, 2020 at 3:00 pm.
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post #4 of 5 Old Mar 25th, 2020, 10:47 am
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Re: ABS Gap Spec. for 1999LT

You do not want it to touch and it should be no more than the 0.55 mm spec or it may not read it. Looks like you are good.
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post #5 of 5 Old Mar 25th, 2020, 1:00 pm Thread Starter
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Re: ABS Gap Spec. for 1999LT

Thanks for the guidance. Nothing is broken, but I am going through the bike and doing well overdue maintenance. Covid-19 gives me the time to do that. My 1999 has 44k on it and frankly I have not really taken as good care of it as I should. So I decided it was either time to get a new bike, or invest in the one I have. I love the K1200lt and decided it was worth it to put some money and time into it. I am reasonably mechanical, but this is the first time I have really gotten the bike stripped down and done what is necessary. Its a long list. One of the things on the list was Spiegler brake lines, while at it I pulled the rear caliper, changed the pads, and removed the ABS sensor to clean it (as suggested by manual). Thats when I decided to check the gap on the ABS. Since I am not having any errors, I will leave it be for now. Don't fix what is not broken I guess.

The rest of the list... I did my first valve clearance adjustment 3 buckets changed, Fixed the broken fuel level sending unit, removed that charcoal canister that caused the problem, air filter, fuel filter, new stainless quick disconnect fuel connectors, brake lines and pads (have not yet finished the bleeding), rebuilt the steering damper with new seals, new plugs and wires, coolant flush, clutch fluid flush, Back-off brake module added, and am in the process of re-installing the shocks (sent to EPM to add the progressive springs). I changed the rear drive fluid and transmission fluid last year and only put 2k miles on the bike last year due to a busy year at work, so I will skip that this year.

None of this would be possible without the help of all you guys here at the forum (and years of posts to sort through), and of course Kirk's videos. In the end, I hope this bike will last me a long time. And I owe you all a big thanks!

Bob
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