1972 C/20 factory cruise control problem. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

terry b · 11-19-2011, 08:46 PM

Hi everybody. Have you ever reworked a factory cruise control to get it working agan? Mine worked a couple of times ten years ago. Then i wrecked the truck. Removed the front clip after the crash. Then it sat until last year. I put it back together. I dont think the vac lines are right. Does anyone have any photos of a corect install? Thanks terry

gcburdic · 11-20-2011, 11:05 PM

ttt...any help here?

domeier · 11-21-2011, 01:33 AM

The service manual has a section in the back that covers it. I don't remember if it shows the vac line routing.

jaros44sr · 11-21-2011, 02:53 PM

A is the large fitting that comes back to the tee fitting, B is the smaller fitting that goes to the engine vacuum.

A is also connected, by way of the tee, to the shut off valve at the brake pedal
A is also connected, by way of the tee, to the vacuum servo, and off of the tee goes to C

jaros44sr · 11-21-2011, 03:10 PM

jaros44sr · 11-21-2011, 03:22 PM

**DANTIP** · 11-21-2011, 03:29 PM

The only problem I have had was when my brake pedal switch was not adjusted right. As mentioned above, the '71 service manual has the cruise stuff in it. If you need parts, the transducers and servos do pop up on Eaby now and then.

Good Luck!!

terry b · 11-21-2011, 08:51 PM

Thanks for the help. I am going to print the diagram and check my routing.

11-19-2011, 08:46 PM	#1
terry b Registered User Join Date: Oct 2011 Location: jackson michigan Posts: 755	1972 C/20 factory cruise control problem. Hi everybody. Have you ever reworked a factory cruise control to get it working agan? Mine worked a couple of times ten years ago. Then i wrecked the truck. Removed the front clip after the crash. Then it sat until last year. I put it back together. I dont think the vac lines are right. Does anyone have any photos of a corect install? Thanks terry

11-20-2011, 11:05 PM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: 1972 C/20 factory cruise control problem. ttt...any help here? __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

11-21-2011, 01:33 AM	#3
domeier Registered User Join Date: Sep 2011 Location: San Jose, California Posts: 784	Re: 1972 C/20 factory cruise control problem. The service manual has a section in the back that covers it. I don't remember if it shows the vac line routing.

11-21-2011, 02:53 PM	#4
jaros44sr Registered User Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,458	Re: 1972 C/20 factory cruise control problem. A is the large fitting that comes back to the tee fitting, B is the smaller fitting that goes to the engine vacuum. A is also connected, by way of the tee, to the shut off valve at the brake pedal A is also connected, by way of the tee, to the vacuum servo, and off of the tee goes to C __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 11-21-2011 at 03:14 PM.

11-21-2011, 03:10 PM	#5
jaros44sr Registered User Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,458	Re: 1972 C/20 factory cruise control problem. __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

11-21-2011, 03:22 PM	#6
jaros44sr Registered User Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,458	Re: 1972 C/20 factory cruise control problem. __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

11-21-2011, 03:29 PM	#7
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,882	Re: 1972 C/20 factory cruise control problem. The only problem I have had was when my brake pedal switch was not adjusted right. As mentioned above, the '71 service manual has the cruise stuff in it. If you need parts, the transducers and servos do pop up on Eaby now and then. Good Luck!!

11-21-2011, 08:51 PM	#8
terry b Registered User Join Date: Oct 2011 Location: jackson michigan Posts: 755	Re: 1972 C/20 factory cruise control problem. Thanks for the help. I am going to print the diagram and check my routing.



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