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-   -   Say What? (https://www.camaro5.com/forums/showthread.php?t=298421)

130R 05-29-2013 12:06 AM

Say What?
 
Huh?

CHMSC 05-29-2013 12:14 AM

:iono: I have had an issue with the right front doing the same thing when downshifting only. Not sure WTF.

jeremywes 05-29-2013 07:27 AM

bad wheel speed sensor? maybe?

CHMSC 05-29-2013 09:11 AM

Already changed mine and didn't do anything.

jeremywes 05-29-2013 09:30 AM

I got the TC/ST lights after replacing all the rear bushings because my toe was so far our that the wheel speed was different from side to side. The next day I got it alligned and problem solved. Might be worth a look

Chevrolet Customer Svc 05-29-2013 09:43 AM

Quote:

Originally Posted by 130R (Post 6601428)
I'm having a problem with my ABS kicking in too easy. This will happen with a moderately hard stop from as little as 35 MPH. To verify it shouldn't be kicking in, I pulled the ABS fuses and the tires don't lock under the same conditions.

I never see an ABS light, but I do sometimes get a "Stabilitrak Active" message in the DIC when the ABS kicks in.

Any ideas?

Hello 130R,

Sorry you appear to be having some issues with your ABS. If you would private message me you VIN and current mileage, I will pull up your vehicle to see if we have any information that may help you here.

Reggie B.
Chevrolet Customer Care

Norm Peterson 05-29-2013 09:47 AM

Quote:

Originally Posted by 130R (Post 6601428)
I'm having a problem with my ABS kicking in too easy. This will happen with a moderately hard stop from as little as 35 MPH. To verify it shouldn't be kicking in, I pulled the ABS fuses and the tires don't lock under the same conditions.

I never see an ABS light, but I do sometimes get a "Stabilitrak Active" message in the DIC when the ABS kicks in.

Any ideas?

Are your front and rear tires at least close to OE sizes? Are the tires reasonably well matched for grip (running skinnies and DR's is about the worst thing you can do for both braking performance and ABS intervention).

Beyond that, it's something that you need to have looked at professionally. Across the keyboard we can only make guesses.


Norm

Norm Peterson 05-29-2013 09:51 AM

Quote:

Originally Posted by CHMSC (Post 6601463)
:iono: I have had an issue with the right front doing the same thing when downshifting only. Not sure WTF.

Are you saying that the RF gets into ABS when all you do is downshift without touching the brakes? If so, that suggests momentary locking or near locking of the left rear.

By any chance, are you also turning left when this happens?


Norm

CHMSC 05-29-2013 10:00 AM

Nope norm only happens downshifting and braking. No downshift and just use the brakes it's fine.

SPCBA 05-29-2013 10:19 AM

Quote:

Originally Posted by CHMSC (Post 6602368)
Nope norm only happens downshifting and braking. No downshift and just use the brakes it's fine.

thats a new one. is it torque management and traction control making the abs freak out?

Norm Peterson 05-29-2013 10:49 AM

I'm still thinking that ST is getting involved somehow. Typically, stability control systems will activate a single brake to prevent what it sees as oversteer or really heavy understeer starting to happen. Braking the outside front (in a turn) to reduce oversteer is one possible action.


Norm

CHMSC 05-29-2013 11:11 AM

Quote:

Originally Posted by Norm Peterson (Post 6602554)
I'm still thinking that ST is getting involved somehow. Typically, stability control systems will activate a single brake to prevent what it sees as oversteer or really heavy understeer starting to happen. Braking the outside front (in a turn) to reduce oversteer is one possible action.


Norm

Quote:

Originally Posted by SPCBA (Post 6602435)
thats a new one. is it torque management and traction control making the abs freak out?

Not sure. I took it to two different dealers and both said operating as designed. I could understand if it was both fronts but only the right front?

Not trying to thread jack OP but maybe this gives you info on your problem.

Norm Peterson 05-29-2013 11:25 AM

If ST thinks that the rear of the car is about to step out to the right (oversteer in a left turn), it'll probably apply the RF brake as a means of dragging the car back in line with the direction that it thinks you're headed in, while slowing you down. Applying any other brake tends to make things worse, either by making the rear even "looser" by throwing away RR lateral grip that you really need or by dragging the left front brake which would exaggerate the yaw rotation directly. Since I suspect that it's a left rear matter, I'd expect that braking that wheel would lock it up for sure, which you definitely wouldn't want happening.


Norm

Norm Peterson 05-29-2013 12:42 PM

Have you installed new brake pads on just the front or just the rear? Front pads with significantly more aggressive bite than the rear pads can cause exactly this situation as well. So might rear brakes that are a lot less grippy, except that you'd be more apt to notice having to stand on the brake pedal a bit harder.


Norm


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