Disc/Drum prop valve hook up? Pics? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jimmydean · 12-04-2006, 10:36 PM

So I got some discs and didn't have the right valve. So then I got a valve/bracket/lines for mounting it, but now it looks like the lines from the valve to the brakes are all wrong.

So do I need to get new lines for the front too? It looks like on in the front and one out the back where as my old setup was both lines out the bottom.

Pics would be great. Thanks.

dwaite72lnghrn · 12-05-2006, 06:45 AM

'71/'72 were like this. Back of MC to front prop valve. Front MC to back prop valve.

70c10 · 12-05-2006, 08:00 AM

Dave, I have the same bracket and valve (1/2 ton) that's in dwaight72's pic. I hooked up my front line last night with a 1/4" to 3/16" brake line reducer fitting. I still have to hook up the rear line that goes on the back end of the valve. I'm going to see if I can get by with a 8" section of 1/4" brake line to connect my existing line to the back of the valve. I got my setup at a junkyard for $5.

jimmydean · 12-05-2006, 04:01 PM

Thanks to you both. Looks like a short section and some reducers are in order. I hope to get everything plumbed this weekend, but I doubt I will get everything bled because I need to finish the rear bags.

**john** · 12-05-2006, 05:32 PM

Also the lines are different between 1/2 and 3/4 ton from M/C to prop valve
1/2 ton - front to front rear to rear
3/4 - ton front to rear rear to front

12-04-2006, 10:36 PM	#1
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Disc/Drum prop valve hook up? Pics? So I got some discs and didn't have the right valve. So then I got a valve/bracket/lines for mounting it, but now it looks like the lines from the valve to the brakes are all wrong. So do I need to get new lines for the front too? It looks like on in the front and one out the back where as my old setup was both lines out the bottom. Pics would be great. Thanks.

12-05-2006, 06:45 AM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: Disc/Drum prop valve hook up? Pics? '71/'72 were like this. Back of MC to front prop valve. Front MC to back prop valve. Attached Images __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne

12-05-2006, 08:00 AM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: Disc/Drum prop valve hook up? Pics? Dave, I have the same bracket and valve (1/2 ton) that's in dwaight72's pic. I hooked up my front line last night with a 1/4" to 3/16" brake line reducer fitting. I still have to hook up the rear line that goes on the back end of the valve. I'm going to see if I can get by with a 8" section of 1/4" brake line to connect my existing line to the back of the valve. I got my setup at a junkyard for $5. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

12-05-2006, 04:01 PM	#4
jimmydean Registered User Join Date: May 2005 Location: Beaverton, OR Posts: 3,728	Re: Disc/Drum prop valve hook up? Pics? Thanks to you both. Looks like a short section and some reducers are in order. I hope to get everything plumbed this weekend, but I doubt I will get everything bled because I need to finish the rear bags.

12-05-2006, 05:32 PM	#5
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Disc/Drum prop valve hook up? Pics? Also the lines are different between 1/2 and 3/4 ton from M/C to prop valve 1/2 ton - front to front rear to rear 3/4 - ton front to rear rear to front __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/



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