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ABS/Brake light Service Brake system Error Message


LouieC

Question

:chevrolet: Ok I could really use some help with this one ....I am getting the error message brake system needs service I hooked up my Tech 2 and got the code for a mismatched wheel speed checked the "speed vs. Spedo and I start out at 3 mph not moving at low speed the abs sensors and spedo are within 1-2 mph the front to rear is also within 1-3 mph at a little higher speed I am almost a full 10 mph difference front to rear but the rear is dead on with the spedo I have the same size tires on the front and rear 275-65-20s I am just having a problem thinking that BOTH front speed sensors have gone bad at the same exact time.... Cant figure what I am missing

 

2004 Silverado LT 5.3 "T" 2wd

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Have you verified air pressures in all 4 tires with the same gauge? Keep in mind that the speed difference is actually in a percentage. 3mph out at 30mph is the same as 6mph at 60mph. If it is showing any speed when not moving, that should be pointing you at the issue.

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