ABS and parking brake light coming on

[Crackhead805]

I have a 2005 silverado 2500 HD diesel. Installed a predator(u7185) on the 80hp setting. As I'm traveling down the road after about four or five miles, the ABS and parking light come on. It doesnt seem to affect the brakes so far but just wondering whats the problem? Any solutions? I have 37inch tires on the truck and have changed the tire size with the programmer.

[mikel]

is the speedo correct with the tune loaded?

Thanks

[Crackhead805]

It's seems to be off about 2mph over.

Thanks
Craig

[wes1600]

I think the differential between engine and ABS get larger as speed increases...try setting as a 35" tire...does the ABS and brake chime come on
at the same speed or higher ?

Just a test...

[Crackhead805]

Hey Wes1600, thanks for the help! I reprogrammed the tire size at 35" from 37"(which is the actual size of tire but worn down a good bit) and that seems to help me problem. After changing the size, I went on a 380mile trip and the warning lights never came on. They usually came on after about 4 or 5 miles but no chime? just the lights and service brakes soon light.

Preciate it!
Crackhead