The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-12-2014, 05:52 PM   #1
dbmx66
Registered User
 
Join Date: Aug 2009
Location: PA
Posts: 881
84 scottsdale vacuum switch on brake pedal?

I have a 84 scottsdale, ive noticed when my engine is at temp and i get on the brake it revs up 200 or so rpms, so i looked up underneath the dash and noticed theres a plunger type switch above the brake light switch. It has a 3/8 rubber line hooked up to one side of it. I cant follow where the line goes, without taking dash apart. Any idea what this is? Ive never seen one before. There wasnt one on my 78 big ten, my brothers 87 custom deluxe or a buddys 85 k5. Any ideas? Thanks
dbmx66 is offline   Reply With Quote
Old 01-12-2014, 06:07 PM   #2
Big Port Jimmy 6
Addicted to Rust
 
Big Port Jimmy 6's Avatar
 
Join Date: Dec 2009
Location: Abbeville SC
Posts: 896
Re: 84 scottsdale vacuum switch on brake pedal?

Cruise control? Jay
__________________
Current trucks:
(48 GMC100 320 inliner) Gone
(48 Suburban in pieces) Sold
87 GMC CCSB Daily Driver

ECTA National record holder XO/PP

We never really grow up, we just learn how to act in public.
Big Port Jimmy 6 is offline   Reply With Quote
Old 01-12-2014, 10:06 PM   #3
dbmx66
Registered User
 
Join Date: Aug 2009
Location: PA
Posts: 881
Re: 84 scottsdale vacuum switch on brake pedal?

thats what im thinking, i was able to follow the vacuum line, it goes out the firewall right above the fuse block, i routes up and behind of the brake booster, but then just stops? its not hooked up to anything
dbmx66 is offline   Reply With Quote
Old 01-12-2014, 10:32 PM   #4
superwade57
Registered User
 
Join Date: Jul 2010
Location: Janesville, WI
Posts: 604
Re: 84 scottsdale vacuum switch on brake pedal?

id say cruise control it used to go to that big round thing with a diaphragm and a chain that went to the throttle. if you don't have the cruise anymore just eliminate it.
superwade57 is online now   Reply With Quote
Old 01-13-2014, 12:48 PM   #5
doubleclucker
ol' black
 
doubleclucker's Avatar
 
Join Date: Jan 2014
Location: ONTARIO
Posts: 63
Re: 84 scottsdale vacuum switch on brake pedal?

dbmx66 -thats exactlly what it goes to; the cruise control servo!
Attached Images
 
doubleclucker is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 01:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com