80 Cruise Control
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 783
Likes: 38
From: Mankato Mn
80 Cruise Control
I'm trying to resurrect the cruise control on my 80 corvette that a previous owner abandoned. By the assembly manual I can see where the vac lines go except it looks like one goes thru the fire wall. Does anyone know where it might go ? And is there anything besides vac lines I need to make it work ? Everything seems to be there except the speedo cables.
Melting Slicks
Joined: May 2015
Posts: 2,365
Likes: 428
From: Cape Girardeau Missouri
Two major components of the system are the transducer (tucked inside the fender ahead of by the master cylinder and the vacuum servo (mounted on a bracket behind the throttle).
Remanufactured transducers are easily available and seem reliable. Servos are out of production and somewhat difficult to find but luckily ones from other GM models are nearly identical. The linkage between the servo and throttle can be found fairly easily.
DocRebuild sells great vacuum hose kits.
Remanufactured transducers are easily available and seem reliable. Servos are out of production and somewhat difficult to find but luckily ones from other GM models are nearly identical. The linkage between the servo and throttle can be found fairly easily.
DocRebuild sells great vacuum hose kits.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The servo head also has electrical line from the control switch that will activate it, set it, resume it, and tap-change speed up/down. Don't know if there is one single wire bundle or two separate wire sets going to the transducer.
Melting Slicks
Joined: May 2015
Posts: 2,365
Likes: 428
From: Cape Girardeau Missouri
In '80 the cruise control system is still quite primitive. There is no "resume" function. The only "special" function is that during cruise operation fully depressing and holding the button will cause the set speed to reduce with cruise operation returning with you release the button. If you quickly and fully depress the button during cruise operation, cruise is cancelled just like when pressing the brake pedal.
BTW, the brake pedal cancel has a fail-safe in that it shuts down the system both electrically and via vacuum either of which will cause shutdown.
