| Re: Need help identifying this part? [message #326791 is a reply to message #326774] |
Wed, 06 December 2017 07:59   |
 |
RF_Burns
Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada
Karma:
|
Senior Member |
|
|
Mike,
It definitely is a line line. Usually plumbed into the rear brake line. Put your foot on the brake and flip its switch ON then let you foot off the brakes. It will hold the rear brakes ON. Its not DOT approved for a parking brake because it could eventually release due to cooling drums or disks, fluid leaks etc.
To release it, flip the switch to OFF then press and release the brake pedal. Opps, now I see someone has posted the switch plate with the instructions.
It looks like a PO has replaced the proportioning valve with just a "T" to the front brakes and the backs are plumbed on their own. Two issues I can think of there... the brake pressures won't be balanced front to back and you wont have the Brake Light come ON if you have a brake problem. They are not expensive, but there is a different valve depending on whether you have original drums on the back, or disk brakes on the rear.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
