How to fix Service Stability message?

GALLUJEF

MEMBER
2005 CHEVROLET AVALANCHE
V8
2WD
AUTOMATIC
196,000 MILES

My truck runs fine, but I can tell in the brake pedal that something isn’t right and then I get a notification on the instrument panel to Service Stability. I have replaced the hubs, rotors and brake pads. I have also replaced the wheel speed sensors on the front wheels. My truck has power, but when I push the gas, I go nowhere, and the brakes are applied without my use. The truck is lifted 3” and has 35” tires. The rotors are crossed drilled. I got them for looks. Please help me figure out what is wrong with the stability feature.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,884 POSTS

If the brakes are locked up you could have a bad brake master that is not fully returning to its neutral position, and it could be why the warning light is on.

Here is a guide that will help explain further:

https://www.2carpros.com/articles/a-comprehensive-guide-to-fixing-automotive-brakes-locking-up

Also, we should run the ABS codes which this guide will help with:

https://www.2carpros.com/articles/anti-lock-system-testing-and-repair-abs

I would loosen the brake master mounting bolts three turns to see if the wheel start to turn again. (Do Not Drive)

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Here is how to change out the brake master in the images below. Check out the images (below). Please let us know what happens. I have also seen the hydro boost push rod need to be adjusted inward.

.

Images (Click to make bigger)