brake light/ abs inop

[LS1MuNkY]

well changed my tires couple days ago and my brake light and abs inop came on any thoughts on what might have happened???
Thanx, Aaron

[Y2KPewterSS]

What size tires did you put on?

[konigandy6]

Bad hub maybe? The speed sensor and hub are one unit so that could cause it.

[LS1MuNkY]

275/55/16

[Y2KPewterSS]

275/55/16

On all 4?

[badazta]

check the harness wires at the back wheels that go to the sensors. did they come undone or did you pinch them with the jack or jack stands?

[LS1MuNkY]

no just the rear... sensors look fine

[slpcamaro]

well changed my tires couple days ago and my brake light and abs inop came on any thoughts on what might have happened???
Thanx, Aaron

same thing has happened to me not after changing tires though but brake light comes on too. I have had the lights pop on right when starting on the car or letting it idle for a little bit and sometimes it doesn't come on could it be the sensor in my rear had that rebuild a few months ago

[ProwlerZ]

That's roughly a 28" tire. If you have 275/40/17s up front, then that's your problem.

Try searching for ABS INOP and BRAKE light, you'll find that this is a common issue with mismatched tire sizes. Basically, your speed sensors in the front aren't in sync with the speed sensors in the back due to a difference in revolutions; Fixes? New tires, ABS delete, or learn to deal with it and understand that until that light pops on, your brakes aren't going to work right, because ABS will try to interfere and simply F- things up.

On the other hand, it could be something completely different; hit a GM dealership and they can read the ABS code and tell ya.

[slpcamaro]

That's roughly a 28" tire. If you have 275/40/17s up front, then that's your problem.

Try searching for ABS INOP and BRAKE light, you'll find that this is a common issue with mismatched tire sizes. Basically, your speed sensors in the front aren't in sync with the speed sensors in the back due to a difference in revolutions; Fixes? New tires, ABS delete, or learn to deal with it and understand that until that light pops on, your brakes aren't going to work right, because ABS will try to interfere and simply F- things up.

On the other hand, it could be something completely different; hit a GM dealership and they can read the ABS code and tell ya.

275/40r17 but had same size on there for 1yr and half before no light and it's turning on me before the car has moved sometimes

[Eugenio_SS]

you're problem is that the rear tire is too tall compared to the front one.
so the front tires rotate more relative to the rear, making the ABS think that you're constantly locking the rear slowly... making the ABS go crazy.
you'd want 275/45-16... not 275/55-16
check this thread out for Overall Diameters: http://www.ls1.com/forums/showthread.php?t=80679

[slpcamaro]

you're problem is that the rear tire is too tall compared to the front one.
so the front tires rotate more relative to the rear, making the ABS think that you're constantly locking the rear slowly... making the ABS go crazy.
you'd want 275/45-16... not 275/55-16
check this thread out for Overall Diameters: http://www.ls1.com/forums/showthread.php?t=80679

makes sense questions though I had these same tires on here for a yr and half about 50k during that time and it just started happening

[konigandy6]

makes sense questions though I had these same tires on here for a yr and half about 50k during that time and it just started happening

Check your speed sensors.

[LS1MuNkY]

thanx for the input guys