ABS light on because the tire ratio is out of calibration

md1 · March 28th, 2008, 08:13 PM

I have a 2003 GT that I had 275/40/18 on the rear and 245/40/18 on the front. I just put 295/45/18 on the rear and I love the way the car looks, sits and hooks now. The ABS light is coming on because the speed ratio between the front and rear is too great. The computer thinks the car is skidding. Dose anyone know what the ratio between the front and rear is needed to just keep the ABS light off? I hate to say this but I never drive the car in rain or snow so is there away to turnoff or disable the antilock braking system. I am going to get KB to disable the traction control and recalibrate the speedometer.
Any help will be greatly appreciated

Thanks
Mark

HMUSN · March 28th, 2008, 08:20 PM

welcome to the forums.

you probably just knocked the sensor loose when putting on the wheels. it's common.

turning off the abs is NOT a good idea but you could just pull the fuse.. I don't think you can turn it off all the way though

md1 · March 28th, 2008, 09:00 PM

I checked all the sensor and they are look fine. One thing I should have said above is the light only comes on if you go above 45 mph. driving around town it will never come on only on the highway.

MustangMatt96GT · March 28th, 2008, 09:10 PM

different size tires on the front vs back will do that. If they arnt the same height.

jrobinsonchicago · March 29th, 2008, 10:22 PM

Mine did the same thing. I hot a pothole with the rear left, checked the sensor, and can't get it to turn off. My traction control light says off too, down by the shifter? Any ideas on a remedy?

md1 · March 30th, 2008, 01:34 PM

Let me explain what’s going on I have a 28.5-inch (295/45/18) tire on the rear and a 25.7 inch (245/40/18) tire on the front. Ok the ABS light is on because the ratio between the front and rear is confusing the ABS computer so it is shutting the ABS system down. What I need to know “what is the min inch tire I can install on the front to stop the ABS light from coming on The tires I had on before was 26.7” (275/40/18) rear and 25.7” (245/40/18) front so a inch different. So would a 235/50/18 (27.3) or 255/45/18 (27) work?

md1 · April 2nd, 2008, 07:26 PM

Put 235/50/18 on and no more ABS light. I am so pleased with how the car looks now. I guess you would say I am old school. I am not a big fan of the low profile tire. I like to see some rubber. Car hookup awesome, the front comes up now and not just spinning tires.

Thanks to everyone for your input

COSTANG · April 5th, 2008, 05:32 AM

So you have a taller tire in the front???

I would have just thrown a 245/45/18 on the front....

It woulda fixed it...

now you have a skinnier front tire, thats taller than the back?

md1 · April 5th, 2008, 02:13 PM

Originally Posted by COSTANG

So you have a taller tire in the front???

I would have just thrown a 245/45/18 on the front....

It woulda fixed it...

now you have a skinnier front tire, thats taller than the back?

No the 235/50/18 is 27.3 inchs where the rear is 28.5 inchs
also the 245/45/18 would be 9.65 inch wide and the 235/50/18 is 9.45 inch so it not much different.

March 28th, 2008, 08:13 PM	#1
md1 Newbie 2003 Mustang GT Join Date: Jan 2008 Location: Southside, VA Posts: 7	ABS light on because the tire ratio is out of calibration I have a 2003 GT that I had 275/40/18 on the rear and 245/40/18 on the front. I just put 295/45/18 on the rear and I love the way the car looks, sits and hooks now. The ABS light is coming on because the speed ratio between the front and rear is too great. The computer thinks the car is skidding. Dose anyone know what the ratio between the front and rear is needed to just keep the ABS light off? I hate to say this but I never drive the car in rain or snow so is there away to turnoff or disable the antilock braking system. I am going to get KB to disable the traction control and recalibrate the speedometer. Any help will be greatly appreciated Thanks Mark __________________ 2003 Mustang GT 3.73, Kenne Bell 2.1 Intercooler @ 10lbs 90mm MAF, 75mm TB, cold air kit, switch chip. 426 rwhp, 446 rwtq, MMS caster camber plates, tube front control arms coil over on front H&R in rear, Rear lower control arms and SFC

March 28th, 2008, 09:00 PM	#3
md1 Newbie 2003 Mustang GT Join Date: Jan 2008 Location: Southside, VA Posts: 7	I checked all the sensor and they are look fine. One thing I should have said above is the light only comes on if you go above 45 mph. driving around town it will never come on only on the highway. __________________ 2003 Mustang GT 3.73, Kenne Bell 2.1 Intercooler @ 10lbs 90mm MAF, 75mm TB, cold air kit, switch chip. 426 rwhp, 446 rwtq, MMS caster camber plates, tube front control arms coil over on front H&R in rear, Rear lower control arms and SFC

March 28th, 2008, 09:10 PM	#4
MustangMatt96GT I Post Entirely Way Too Much 1996 Mustang GT 19.090@71.46 Join Date: Dec 2006 Location: Lakewood, CO Posts: 6,912	different size tires on the front vs back will do that. If they arnt the same height. __________________ If you are not willing to stand behind our troops, please feel free to go stand in front of them! If "drifting" were really racing, they'd have a track for it"

March 30th, 2008, 01:34 PM	#6
md1 Newbie 2003 Mustang GT Join Date: Jan 2008 Location: Southside, VA Posts: 7	Let me explain what’s going on I have a 28.5-inch (295/45/18) tire on the rear and a 25.7 inch (245/40/18) tire on the front. Ok the ABS light is on because the ratio between the front and rear is confusing the ABS computer so it is shutting the ABS system down. What I need to know “what is the min inch tire I can install on the front to stop the ABS light from coming on The tires I had on before was 26.7” (275/40/18) rear and 25.7” (245/40/18) front so a inch different. So would a 235/50/18 (27.3) or 255/45/18 (27) work? __________________ 2003 Mustang GT 3.73, Kenne Bell 2.1 Intercooler @ 10lbs 90mm MAF, 75mm TB, cold air kit, switch chip. 426 rwhp, 446 rwtq, MMS caster camber plates, tube front control arms coil over on front H&R in rear, Rear lower control arms and SFC

April 2nd, 2008, 07:26 PM	#7
md1 Newbie 2003 Mustang GT Join Date: Jan 2008 Location: Southside, VA Posts: 7	Put 235/50/18 on and no more ABS light. I am so pleased with how the car looks now. I guess you would say I am old school. I am not a big fan of the low profile tire. I like to see some rubber. Car hookup awesome, the front comes up now and not just spinning tires. Thanks to everyone for your input __________________ 2003 Mustang GT 3.73, Kenne Bell 2.1 Intercooler @ 10lbs 90mm MAF, 75mm TB, cold air kit, switch chip. 426 rwhp, 446 rwtq, MMS caster camber plates, tube front control arms coil over on front H&R in rear, Rear lower control arms and SFC

March 29th, 2008, 10:22 PM	#5
jrobinsonchicago Newbie Join Date: Mar 2008 Posts: 37	Mine did the same thing. I hot a pothole with the rear left, checked the sensor, and can't get it to turn off. My traction control light says off too, down by the shifter? Any ideas on a remedy?

April 5th, 2008, 05:32 AM	#8
COSTANG Newbie Windsor 2000 Mustang GT Join Date: Mar 2008 Location: Colorado Posts: 28	So you have a taller tire in the front??? I would have just thrown a 245/45/18 on the front.... It woulda fixed it... now you have a skinnier front tire, thats taller than the back?

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