After about 5 minutes of driving my truck my "service brake system" DTC comes on and my ABS and E-brake lights illuminate. The brakes don't feel any different or hampered in anyway, but still it freaks me out enough not to want to drive it.

Here's the interesting part. It first happened at HRP when I had TXsilverado's 26" ET streets on. Afterwards when swapping back to my stock wheels the light never came back on driving an hour back home. Tonight I put on Zzebes 26" ET streets on and within 5 minutes the light came on, and is doing it consistently. Now I have no idea if this is the problem, but it's just strange how it's only happened with the smaller 26" tires in the rear. Is there some kind of sensor that maybe flipping out because of the difference in tire sizes? (Fronts are stock 17"s with stock american generals)...Or anything else for that matter that might be causing it.

Thanks

 

So it only comes on when you have the smaller tires on there?

 

sounds like it's the sensor on the calliper that triggering it.
they are sensing 2 different tire sizes.
at the track my old 26's would do it but not my 28's.
i'm running a 30" tire up front.

 

That explains it, thanks for the input!

 

mine came on tonight with the 20's on all i can think is not enough vacumn

 

My bro's 05 silverado does that after the gear swap he did...does anyone know how to fix this with EFI live?

 

yeah mine does it all the time after i had it programmed for bigger tires...allen thinks i might have a bad ecu as it does it all the time on start up..

 

Dusting this thread off.

How do you fix this problem after a gear swap?
I've recalibrated for the new gears but occasionally still get this on display.

Usually only around 85/95 ish

 

ttmft

 

seriously though It keeps making me worried that the brakes are going to lock up.