GMT900 Cruise control issues

[general disarray]

Hello all,

 

Vehicle in question is a 2010 silverado 5.3 Z71

 

I recently replaced my brake booster and master cylinder. All went well and brakes are functioning but now my cruise control is not working. The light on the steering wheel switch comes on but it does not set.

 

I did some research and it sounded like the brake pedal switch. I changed that and no luck - further more my brake lights don't stay on and they illuminate properly.

 

Also, double confirm brake booster part numbers with chevrolet and the replacement was ACdelco.

 

Any ideas?

[newdude]

There are codes that will set for cruise control. Gotta have a shop or dealer scan for them though. 20877277 (178-0800) for the booster and 20845345 (174-1159) for the master.

 

What was the reasoning for changing the master and the booster?

[Coby7]

Does Your high brake light work?

[general disarray]

There are codes that will set for cruise control. Gotta have a shop or dealer scan for them though. 20877277 (178-0800) for the booster and 20845345 (174-1159) for the master.

 

What was the reasoning for changing the master and the booster?

 

 

Thanks and those are the proper parts. Intermittent hard brake - felt like a rock. After removing the brake booster we saw the master was leaking into the booster.

Do not currently have any warning or check lights - my brother has a snap on scan tool so hopefully that will show. Thanks! Let me know if there is anything I can try in the meantime

[general disarray]

Does Your high brake light work?

Yes all brake lights are functioning as they should - not on when not pressed all three on when pressed

[general disarray]

Also - I made sure the pedal was returning all the way back. Which it is - I am not able to pull it back anymore

[general disarray]

I think I found whats going on - 1st I am an idiot. When I was testing I was under 25mph so it would not engage. Turned out to be the switch and possibly the harness.