Front brake suddenly grabs on left side only, traction control icon shows briefly
It happened yesterday, has never happened before in the 3-4 years I have been riding it. Dealer says it shows no codes, and they can get it to do it by starting a turn. It jerks hard to the left for a fraction of a second, then rides norma.lly. You can get it to repeat in a few seconds by startng a turn. 2008 GS 5 speed.
Bill
The VSS is confused for some reason. Best guess it's a bad sensor. The most likely culprit is the yaw rate sensor in my thinking. Because no code. Also maybe the steering angle sensor if the calibration is way off. But you should have other symtoms.
It happened yesterday, has never happened before in the 3-4 years I have been riding it. Dealer says it shows no codes, and they can get it to do it by starting a turn. It jerks hard to the left for a fraction of a second, then rides norma.lly. You can get it to repeat in a few seconds by startng a turn. 2008 GS 5 speed.
Bill
x
So what does that mean exactly ?
That even though they can reproduce the problem, they are at a loss as what to do because there are no codes ??
seems that if this can be done only on a turn that there is a problem with the caliper and feed to that wheel. Possibly pads hagging up and not making full contact or something impeding flow to that caliper. As mentioned above check all sensors involved in the stability control system...VSS ABS etc otherwise check the caliper pads and brake lines...
2012 RS sm5 , 998cc V-Twin 106hp DIY brake and park brake Classic Black
seems that if this can be done only on a turn that there is a problem with the caliper and feed to that wheel. Possibly pads hagging up and not making full contact or something impeding flow to that caliper. As mentioned above check all sensors involved in the stability control system...VSS ABS etc otherwise check the caliper pads and brake lines...
How could a defective caliper cause the VSS light to come on at the same time?
Has the brake fluid ever been flushed and changed? On a 2008 it should have been changed four times by now. If not, really dirty brake fluid could be your problem.
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Yeah. Looks like you're getting an unnecessary / premature activation of the VSS system. The light coming on momentarily is a key, as Billy mentioned. For our later year models, there is a quick and simple Yaw Rate Sensor Reset procedure done through BUDS. You might ask your dealer if that also applies to model year 2008. He may have to look through the manual or fire up the program to see if there is a page for that. If so, I would recommend on doing that first since it only would be a 5 minute job. Checking the brakes - always a good idea anyway.
Last edited by Snowbelt Spyder; 04-22-2017 at 12:09 PM.
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How could a defective caliper cause the VSS light to come on at the same time?
Sensor indicates that something is slowing ONE WHEEL, when the computer knows that no braking pressure is being applied.
Binding caliper, bad wheel sensor or a hose being pinched in a manner that it puts pressure on the caliper.
Sensor indicates that something is slowing ONE WHEEL, when the computer knows that no braking pressure is being applied.
Binding caliper, bad wheel sensor or a hose being pinched in a manner that it puts pressure on the caliper.
If the light came on because of a problem there would be a code. No code. The VSS light comes on because it thinks there is a reason to step in and is applying the front left brake.