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Old 10-21-2004, 09:11 PM   #1
68w/sbc406
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need pictures

i need some pictures of a disc brake prop valve location. is it up by the master like drum ones or down on the frame crossmember like 73+?
Thanks
Ben
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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Old 10-21-2004, 09:15 PM   #2
Tx Firefighter
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On pre 73 trucks, it's just below the master cylinder up on the firewall.
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Old 10-21-2004, 09:27 PM   #3
72 CustomCamper
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This is where the one is on my 72...


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Old 10-21-2004, 11:35 PM   #4
68w/sbc406
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do you have a side view???
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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Old 10-22-2004, 12:39 AM   #5
72 CustomCamper
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No but I can take one tomorrow...


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Old 10-22-2004, 05:42 AM   #6
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Here is a side view of my '72.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper
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Old 10-22-2004, 09:50 AM   #7
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Here's the valve off a 78 3/4 ton 4x4 that I am using on my 70 K5.
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Old 10-22-2004, 08:47 PM   #8
68w/sbc406
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thanks for the pictures guys. a few questions. what is the spliter thingy in the first picture on the front line of the master cylinder? the second picture looks like the one i am going to be putting on, but why does it have holes in it to bolt to the frame? shouldnt it look like the third picture? compared to the other 2 pictures the second one looks backwards with the lines going from front to back. sorry if these are stupid questions. which lines are what on a prop valve. thanks guys
Ben
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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Old 10-22-2004, 09:37 PM   #9
dwaite72lnghrn
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My 72 originally had the rear reservoir larger than the front for the disk brakes so the rear reservoir brake line is routed to the front of the prop valve. Then to the front brakes. the front reservoir is smaller and goes to the rear of the prop valve to the rear brakes.
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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
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Old 10-22-2004, 10:03 PM   #10
68w/sbc406
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so...
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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Old 10-22-2004, 10:53 PM   #11
dwaite72lnghrn
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On mine yes, But where did your Master cylinder come from if both reservoirs are the same size it wouldn't matter which one they came off. but the lines you have drawn are the routing on mine. back prop valve to rear brakes, front bottom to front brakes. The assembly manual shows a different setup than mine but it really doesn't show the 72 well in the back of the book but shows the 67-70 pretty good .
The disk brakes use more fluid when they wear so thats why the disk master cyl. is larger.
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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

Last edited by dwaite72lnghrn; 10-22-2004 at 10:54 PM. Reason: additions
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Old 10-22-2004, 11:34 PM   #12
72 CustomCamper
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Quote:
Originally Posted by 68w/sbc406
thanks for the pictures guys. a few questions. what is the spliter thingy in the first picture on the front line of the master cylinder?
Ben
The spliter on my pic is because my truck was set up for trailer brakes. When you hit the brakes it sends fluid to the trailer brake box to activate the trailer's brakes electricly...


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Old 10-23-2004, 12:12 AM   #13
68w/sbc406
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ohh. got it. had me confused just a bit
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags

'02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car)

1993 Cherokee work ride/weekend wheeler
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