Author Topic: ABS issue  (Read 2850 times)

Offline Filmcamera

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ABS issue
« on: October 25, 2017, 09:04:20 AM »
Since I installed new front discs on my bike a couple of weeks ago I have picked up an odd ABS error.

Looking at the ABS fault code guide I am pretty sure it is a front or rear sensor gar error because it resets itself the next time I start the bike whereas most fault codes do not.

The odd thing is that the ABS works just fine (no flashing warning light etc) as long as I keep the bike under 70 mph - once I go over that after three or four minutes I get the error and the lights flash etc.

I have double checked the ABS ring on the front wheel and the gap is ok and the ring seems correctly fitted and tight. 

The only thing I can think of is that the gap changes on different parts of the rim but that the sensor can deal with that up to a certain number of rotations per minute but above that it gets overloaded. 

Has anyone else ever had this issue? If you did how did you solve it?
  • San Jose, Costa Rica
  • 1991 K100RS 16v ABS1, 2018 Triumph Street Triple RS 765
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Offline The Mighty Gryphon

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Re: ABS issue
« Reply #1 on: October 25, 2017, 01:16:11 PM »
Are you at the wider end of the gap specification?  Are the faces of the sensors clean?
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Filmcamera

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Re: ABS issue
« Reply #2 on: October 25, 2017, 01:24:04 PM »
Yes, I am at the wider end, I have one spacer in but it I take it out the gap is only 0.30mm so I do need that one spacer.  I will double check and clean the sensor and the ABS ring while I am at it
  • San Jose, Costa Rica
  • 1991 K100RS 16v ABS1, 2018 Triumph Street Triple RS 765
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Offline bizzaro

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Re: ABS issue
« Reply #3 on: October 25, 2017, 02:10:30 PM »
I would check n clean the rear as well. It's not a "wearable" Item that should change,  but if it was marginal anyway, it could be coincidental?  :dunno2: Can't hurt? :popcorm   Upon reconsidering, I would do them at different times, just so I would know if it fixed it, which one was at fault.......................if either is? :dunno
  • Vermont
  • Current:1994 BMW K1100LT Previous: 1982 Yamaha virago 920,1973 Honda CB550,1976 Yamaha 650 Special
See Ya in the Twisties,
 Bizz

Offline Filmcamera

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Re: ABS issue
« Reply #4 on: November 07, 2017, 07:17:35 PM »
I took out the only remaining spacer and now am too close to be within spec but the issue has gone away so that is OK by me.

Now I have the new discs and pads properly bedded in the bike brakes very well indeed. I feel SO much more confident now I can stop when I need to!

Only a few weeks to go to dry season   :riding: :clap:
  • San Jose, Costa Rica
  • 1991 K100RS 16v ABS1, 2018 Triumph Street Triple RS 765
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Offline bizzaro

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Re: ABS issue
« Reply #5 on: November 07, 2017, 10:12:21 PM »
 :2thumbup: Glad to hear it.  Yea, those specs seem a bit arbitrary.  I mean like you said, moving it less than specified corrected the problem.   :riding:
  • Vermont
  • Current:1994 BMW K1100LT Previous: 1982 Yamaha virago 920,1973 Honda CB550,1976 Yamaha 650 Special
See Ya in the Twisties,
 Bizz

Offline Motorhobo

  • +20 years of K75
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Re: ABS issue
« Reply #6 on: November 08, 2017, 12:49:27 PM »
I had that happen to me, and it was because when I installed the wheel, I didn't do it using the proper centering procedure, so it was slightly out of alignment which made it too whacky for the ABS to figure out. Loosened everything and tightened it back down according to the proper procedure and the fault went away.
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 193k miles
1994 K75 since 2013, 76,000 mi (11k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B'

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

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