Cruise Control Malfunction Any Ideas?

[spankrz]

i have a 07 nnbs silverado 5.3 afm with about 133,000 miles on it. cruise control intermittently, and is completely unpredictable. it works about one out of every ten times i drive the truck. i would like to fix, i love cruise control. any ideas as to what could be causing this? this doen't seem like a common problem with thease....

[jdewolfe]

Are all tires the same size? If so, maybe a bad wheel sensor. Just an idea, but I could be wrong.

[Doug_Scott]

May also want to take a look at the brake light switch. If not adjusted properly it can disable cruise.

[spankrz]

i never thought of the brake light switch but i bet that is it, last time i was pulling trailor the brakes would turn themselves on and i would have to tap bottom of petal up with my foot to turn off.... how should i check? pick up on pedal with foot and see if cruise works? can it be adjusted?

[spankrz]

well, that was easy. it is the brake light switch. never payed attention before because it didnt cross my mind but if i watch my trailer brake controller the little (.) lights up when pedal is depressed when not hooked to a trailor. play with the pedal a little bit, and i can get it to go off and the cruise will turn on just fine.

 

so my next question is how is it adjusted?

[8.1HD/ALLISON]

If it is adjustable, you usually have to spin it 1/4 or 1/2 turn to unlock if from the bracket. If no adjustment, replace it.

[66Snaake]

Cruise Control intermittant? Change out the brake light switch, P/N 25981009. About $17, chevy house. You will need a 8mm(?) wrench, a small flat blade screw driver, and a wirey little person to get flat on their back and reach up under the pedal. 15 minutes. Poor design, only lasted 120,ooo miles!

[jdubub]

I just recently started having issues with my cruise as well. It only works sometimes. I cut 2 notches off of my spring in my brake light switch about a year ago because my lights took forever to come on during braking, but it just started acting up. I wonder if this is my problem? But my brake lights do not light up until the brake pedal is pushed