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Had tires changed friday, now ABS light is on.

I never really looked at the ABS setup but looking at the front tire it looks like the ABS sensor is maybe a millimeter from this disk that has slots that I think the sensor uses to determine if the tire is slipping.

On the rear the sensor is maybe 1/2" away from the disk. Almost makes me think that the mechanic forgot to reinstall a spacer or something else went wrong. Could someone compare my photo to what their GTS300 abs looks like?

UPDATE - As I assume I will get several replies suggesting this... I DID go through the ASR reset procedure... start engine, disable ASR, hold brake while holding ASR button... wait for flashing then drive 20mph 'till light goes out.

ABS light turns on when I turn the vespa on and it never goes off. Attempted the reset 3 times now. Also ASR behaving fine... or not working at all... i'm saying I don't notice anything from ASR but haven't tried on slippery pavement
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
⚠️ Last edited by whitemiata on UTC; edited 1 time
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You need to recalibrate the ABS/ASR as outlined in the manual. You need to do this every time a tyre is changed, or tyre pressures are changed by a large amount.
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jimc wrote:
You need to recalibrate the ABS/ASR as outlined in the manual. You need to do this every time a tyre is changed, or tyre pressures are changed by a large amount.
so it's normal that the sensor on the front wheel is essentially microns away from the disk with slots that I believe it's reading whereas the sensor on the back is more than 1 cm away from the disk with slots?

I'm not talking about the braking disk here... I don't know what to call the metal circle with radial slots that I believe the ABS uses.
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whitemiata wrote:
jimc wrote:
You need to recalibrate the ABS/ASR as outlined in the manual. You need to do this every time a tyre is changed, or tyre pressures are changed by a large amount.
so it's normal that the sensor on the front wheel is essentially microns away from the disk with slots that I believe it's reading whereas the sensor on the back is more than 1 cm away from the disk with slots?

I'm not talking about the braking disk here... I don't know what to call the metal circle with radial slots that I believe the ABS uses.
Apols, the usual reason for this is as I said above - BUT it does look as though your mechanic has installed the thick outer washer on the inside of the exhaust support rather than on the outside, immediately under the axle nut.

Can you see what is between the axle nut and the bearing, if anything?
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jimc wrote:
whitemiata wrote:
jimc wrote:
You need to recalibrate the ABS/ASR as outlined in the manual. You need to do this every time a tyre is changed, or tyre pressures are changed by a large amount.
so it's normal that the sensor on the front wheel is essentially microns away from the disk with slots that I believe it's reading whereas the sensor on the back is more than 1 cm away from the disk with slots?

I'm not talking about the braking disk here... I don't know what to call the metal circle with radial slots that I believe the ABS uses.
Apols, the usual reason for this is as I said above - BUT it does look as though your mechanic has installed the thick outer washer on the inside of the exhaust support rather than on the outside, immediately under the axle nut.

Can you see what is between the axle nut and the bearing, if anything?
I'm embarassed to say that I'm not 100% sure what part you're asking me to look at. I'm attaching another photo.

When you say the axle nut do you mean the nut with the cotter pin in it?
Forum member supplied image with no explanatory text
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assuming that I understood what I'm supposed to be looking at... here are three photos showing respectively the nut with the cotter pin, then the axle on the tone ring (that's apparently what that disc with the slots is called) side and then the axle looking out from the wheel towards the muffler support stuff.
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Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
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Looking at the photos you can clearly see that the nut is right up against the bearing, and the washer that should be between nut and bearing is (incorrectly!) on the other side.

Either take it back to the shop or DIY. At the very least the shop should be made aware of this mistake, and make some amends.
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jimc wrote:
Looking at the photos you can clearly see that the nut is right up against the bearing, and the washer that should be between nut and bearing is (incorrectly!) on the other side.

Either take it back to the shop or DIY. At the very least the shop should be made aware of this mistake, and make some amends.
So you see ALL the parts there they're just installed incorrectly? (that's better than "they forgot something" because by now two days later who knows where the parts would be...)

Is the washer the thing that I highlighted in the attached photo? And if so does it just need to be installed on the outside of the suspension arm rather than the inside in the same exact orientation it's installed in now?

I'm most likely going to take the bike back to them and the thing is they aren't a vespa shop. Not saying that justifies screwing up the mounting of things... I mean whenever I'm taking something apart that I'm not familiar with I acknowledge my lack of familiarity and if something isn't TOTALLY obvious I take photos or video... with smartphones in our pockets it's almost criminal not to do that Razz emoticon Razz emoticon Razz emoticon

Btw i really appreciate all the handholding ... i'm sure you're slapping your forehead all throughout this thread Razz emoticon
Forum member supplied image with no explanatory text
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I just went out and looked at my GTS. There is certainly a washer/spacer between the nut and bearing as Jim said. It is not, however, the flanged part that you circled. It is smaller in diameter and thicker.

The AF1 site has a complete set of parts diagrams for the GTS 300 ABS.

http://www.af1racing.com/store/ProdImages/st3/EVGD000US1.pdf
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Yes, he did. He has installed the small spacer from the inside of the swing arm. This goes on the outside and before the axle nut...
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Dooglas wrote:
I just went out and looked at my GTS. There is certainly a washer/spacer between the nut and bearing as Jim said. It is not, however, the flanged part that you circled. It is smaller in diameter and thicker.

The AF1 site has a complete set of parts diagrams for the GTS 300 ABS.

http://www.af1racing.com/store/ProdImages/st3/EVGD000US1.pdf
Don't rely on parts diagrams for the correct order for assembly! There are several misleading diagrams in just about every model's parts list.

That said, the one above is OK for that page. <<<< Duff gen!
⚠️ Last edited by jimc on UTC; edited 1 time
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If I understand correctly the shiny part on the left should go behind the nut on the right.
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Exactly...
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Re: Help - did my mechanic install my wheel wrong? GTS 300i
whitemiata wrote:
Had tires changed friday, now ABS light is on.

I never really looked at the ABS setup but looking at the front tire it looks like the ABS sensor is maybe a millimeter from this disk that has slots that I think the sensor uses to determine if the tire is slipping.

On the rear the sensor is maybe 1/2" away from the disk. Almost makes me think that the mechanic forgot to reinstall a spacer or something else went wrong. Could someone compare my photo to what their GTS300 abs looks like?

UPDATE - As I assume I will get several replies suggesting this... I DID go through the ASR reset procedure... start engine, disable ASR, hold brake while holding ASR button... wait for flashing then drive 20mph 'till light goes out.

ABS light turns on when I turn the vespa on and it never goes off. Attempted the reset 3 times now. Also ASR behaving fine... or not working at all... i'm saying I don't notice anything from ASR but haven't tried on slippery pavement
FIX THIS IMMEDIATELY!!! If the rear wheel spacers are incorrectly placed it can lead to a cracked exhaust header and a broken bolt that holds the shock/muffler bracket to the motor. I had to drill it out and use an easy-out to remove the threaded stud. (Speaking from personal experience...not fun.)
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Re: Help - did my mechanic install my wheel wrong? GTS 300i
marklehnert wrote:
whitemiata wrote:
Had tires changed friday, now ABS light is on.

I never really looked at the ABS setup but looking at the front tire it looks like the ABS sensor is maybe a millimeter from this disk that has slots that I think the sensor uses to determine if the tire is slipping.

On the rear the sensor is maybe 1/2" away from the disk. Almost makes me think that the mechanic forgot to reinstall a spacer or something else went wrong. Could someone compare my photo to what their GTS300 abs looks like?

UPDATE - As I assume I will get several replies suggesting this... I DID go through the ASR reset procedure... start engine, disable ASR, hold brake while holding ASR button... wait for flashing then drive 20mph 'till light goes out.

ABS light turns on when I turn the vespa on and it never goes off. Attempted the reset 3 times now. Also ASR behaving fine... or not working at all... i'm saying I don't notice anything from ASR but haven't tried on slippery pavement
FIX THIS IMMEDIATELY!!! If the rear wheel spacers are incorrectly placed it can lead to a cracked exhaust header and a broken bolt that holds the shock/muffler bracket to the motor. I had to drill it out and use an easy-out to remove the threaded stud. (Speaking from personal experience...not fun.)
Also be sure the ABS sensor is not damaged due to rubbing
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Re: Help - did my mechanic install my wheel wrong? GTS 300i
Budz wrote:
Also be sure the ABS sensor is not damaged due to rubbing
Unlikely - it's about 8mm further away than it should be!
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schematic only confused me more?
my apology for my lack of knowledge here... but I found the rear wheel schematic in the pdf provided... and when I look at it it looks like the silver bit I was told should go on the outside... is actually on the INSIDE of the suspension arm...

In the attached image that's part #12, no?
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As jimc already mentioned schematics aren't always correct. The spacer goes on the outside...
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I've edited my post above that previously approved that parts diagram. Apologies for confusing the issue.

It's wrong.

Part no. 12 (spacer) must always be on the outside of the support arm.
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Taken from the workshop manual...
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Here is a photo of the right side of the axle on my GTS 300 ABS for comparison to yours.
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this only issue with certain garages they do a bodge job

I remember twice I went for a repair

1. fuel line wasn't secure and lucky I spotted it as it was dripping on exhaust
2. exhaust bolts where lose after having a new tyre

so it shows some garages don't double check or to lazy to do the job properly
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ukguy2k wrote:
this only issue with certain garages they do a bodge job

I remember twice I went for a repair

1. fuel line wasn't secure and lucky I spotted it as it was dripping on exhaust
2. exhaust bolts where lose after having a new tyre

so it shows some garages don't double check or to lazy to do the job properly
Don't blame the shop, blame the tech. The whole shop didn't work on it, one tech did. Razz emoticon
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Re: Help - did my mechanic install my wheel wrong? GTS 300i
jimc wrote:
Budz wrote:
Also be sure the ABS sensor is not damaged due to rubbing
Unlikely - it's about 8mm further away than it should be!
my bike needed one washer/spacer to avoid what happened to my ABS sensor with the 13" wheels. Also, you can and should reset the ASR but you can't resent the ABS
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WEB-Tech wrote:
ukguy2k wrote:
this only issue with certain garages they do a bodge job

I remember twice I went for a repair

1. fuel line wasn't secure and lucky I spotted it as it was dripping on exhaust
2. exhaust bolts where lose after having a new tyre

so it shows some garages don't double check or to lazy to do the job properly
Don't blame the shop, blame the tech. The whole shop didn't work on it, one tech did. Razz emoticon
Right or wrong, the actions of one individual will determine a customer's opinion of a whole shop. It's up to the owners and managers to be SURE that all of their techs are 100% obsessed with perfection. Mistakes happen, of course, but customers will likely shun any establishment that makes those mistakes.
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When in the rare occasion I take a vehicle to a shop, I ask to have the tech that is best at the problem I am having working on the vehicle. I don't care if it takes a day or a week till he can get to work on it.

All techs have stuff they are best at or just enjoy doing so they do it better.
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