abs inop & brake light???????
#1
Staging Lane
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abs inop & brake light???????
ok guys i need some help,i bought some mt's 295 45 17's today and like any of us would i went to perris and burned off my old bfg's lol after i drove to a tire shop about 2 miles away and got my new tires on (balanced) and about a mile after leaving the shop my abs inop and brake light came on if i shut it off and turn it on again the light will stay off for about 2 miles. i have not pulled any codes and the brakes feel normal! any ideas? thanks in advance for any help
#4
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Ya its the tire size I get the same thing with my MT 295/50 R16's if you measure them their about a 27.5" tall tire fronts should be about 26" tall. As stated above More than an inch difference sets the ABS INOP.
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thanks guys! and yes these tires are pretty dam tall even though they are 45's ill measure tomorrow to know for sure. is there a way to fix it? those lights are killing me!... i had 315 on the car at first and it never happened before,wonder why? George... send me your connects # in tj lol
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#13
Launching!
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you cant go bigger 2% or smaller 3% or it will flag the abs...u can do the math for overall tire diameter like this
295 Tire size
x Times
.40 .A/R
x Times
2 2
/ divided by
25.4 25.4
+ Plus
18 Rim Diameter
so lets say for instance u have a 275/40/17 in the front and a 295/45/17 in the rear
your overall diameter of the front tires is 25.66"
your overall diameter of the rear tires is 27.45"
thats a pretty drastic diffrence..then u would have to do that math to see the actual percentage...hope that helps tho
VSS or vehicle speed sensor..senses the revs per mile on each individual wheel to activate abs and trac control
295 Tire size
x Times
.40 .A/R
x Times
2 2
/ divided by
25.4 25.4
+ Plus
18 Rim Diameter
so lets say for instance u have a 275/40/17 in the front and a 295/45/17 in the rear
your overall diameter of the front tires is 25.66"
your overall diameter of the rear tires is 27.45"
thats a pretty drastic diffrence..then u would have to do that math to see the actual percentage...hope that helps tho
VSS or vehicle speed sensor..senses the revs per mile on each individual wheel to activate abs and trac control
Last edited by SSMOKIN_Y2KSS; 06-28-2009 at 03:37 AM.
#14
Teching In
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I currently have the same problem! I am sure because of the 373's gears I installed. But we are also talking about having taller tires would make this problem come up, but when I had 20" wheels, I never had this issue. ??????
Last edited by Ls1Strokin; 06-28-2009 at 07:58 PM. Reason: mispelled
#17
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Its only a problem when there is a difference in diameter between the front and rear. For example I measured my fronts at about 25.6 inches tall, and my rear tires at about 27.6 inches tall, doesn't sound like a big difference but when I measured the circumfrence of the tires the rears were like 8 inches longer around so their spinning at a slower rate than the fronts are and the individual wheel speed sensors sense that. Also your speedo will be on the slow side with bigger tires in back, I've verrified with gps that when the speedo is reading 60mph my actual speed is 68-69 mph...