There are a number of things that could be causing your cruise not to work. The simple ones are faulty switches on the brake/clutch pedals.
Off the top of my head, I can't remember the intricate workings to further diagnose but it would be helpful if you could confirm what year your car is, and wheter it's manual or auto then others will no doubt chip in.
Go to www.townsendimports.com there is a complete diagnostic explanation of the cruise control.
The most likely fault, I believe, is a faulty or maladjusted brake or clutch ( if it's a manual ) switch. These switch electrically and vacuumly ! But the Townsend site will tell you what and how to check.
My car is a 93' 9000 Aero, manual, the first of
You both could be right.
I recently had the clutch master cylinder replaced and a clutch feed pipe replaced.
Do you think that they caused the fault to my cruise control?
My cruise control stopped working after I had the clutch master cylinder replaced as well. What had happened was clutch pedal position changed slightly, and the plate attached to the clutch pedal wasn't pressing down the cruise control switch enough and overriding the switch on the stalk.
A VERY gentle bend to this plate was all that was needed to get things going again. The subtle application of brute force wins again!