brakeline routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 03-30-2004, 08:24 AM

Could use a pic of the MC and prop valve. Need to know which reservoir is for the front and rear. Here's my thoughts rear(large) to front disc and front(small) to rear drums. This is on the 71. Thanks,

JimKshortstep4x4 · 03-30-2004, 10:00 AM

Line routing is different for the trucks. Is yours a 1/2 ton or 3/4 ton?

Here is a picture of a 1/2 ton setup.

Jim

**JIMs70GMC** · 03-30-2004, 10:09 AM

3/4 ton 4wd w/ power brakes

JimKshortstep4x4 · 03-30-2004, 10:18 AM

3/4 ton will hook up opposite from the pic. In the pic the back reservoir goes to the rear brakes since it plumbs into the rear of the prop valve.

On the 3/4 ton the rear reservoir plumbs into the front of the prop valve, and the line from the front of the prop valve goes to the front brakes. I am not sure why it is plumbed this way but I have never seen an exception.

Jim

**JIMs70GMC** · 03-30-2004, 10:35 AM

That's what I thought, I got mine reversed. Bending brakelines is a PITA!

Dean · 03-30-2004, 10:48 AM

That is correct Jim. Let me know if you need pics of my trucks.

**JIMs70GMC** · 03-30-2004, 11:08 AM

Jim, Thanks.
Dean, Always like to see pics of your trucks!
My 70 w/ power drums is different as was the donor truck (70 w/ power drums also).

Dean · 03-31-2004, 08:56 AM

You are probably done by now, but here is a shot of the routing on one of my K20s.

Dean · 03-31-2004, 08:56 AM

another.

**JIMs70GMC** · 03-31-2004, 09:36 AM

Not done yet, been raining. Thanks for the pics. The brace off the front of the booster to the firewall-where does it attach on the firewall? I should have taken better pics prior to disassembly.

Dean · 03-31-2004, 09:57 AM

I can take a picture of the brace. You will probably have to drill a hole for the brace depending on what that cab you are using had. I usually have to drill a hole for my conversions. This last one was a pain because the hole is under all of that factory sound deadening material.

03-30-2004, 08:24 AM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	brakeline routing Could use a pic of the MC and prop valve. Need to know which reservoir is for the front and rear. Here's my thoughts rear(large) to front disc and front(small) to rear drums. This is on the 71. Thanks, __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-30-2004, 10:00 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Line routing is different for the trucks. Is yours a 1/2 ton or 3/4 ton? Here is a picture of a 1/2 ton setup. Jim Attached Images

03-30-2004, 10:09 AM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	3/4 ton 4wd w/ power brakes __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-30-2004, 10:35 AM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	That's what I thought, I got mine reversed. Bending brakelines is a PITA! __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-30-2004, 11:08 AM	#7
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Jim, Thanks. Dean, Always like to see pics of your trucks! My 70 w/ power drums is different as was the donor truck (70 w/ power drums also). __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-30-2004, 10:18 AM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	3/4 ton will hook up opposite from the pic. In the pic the back reservoir goes to the rear brakes since it plumbs into the rear of the prop valve. On the 3/4 ton the rear reservoir plumbs into the front of the prop valve, and the line from the front of the prop valve goes to the front brakes. I am not sure why it is plumbed this way but I have never seen an exception. Jim

03-30-2004, 10:48 AM	#6
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	That is correct Jim. Let me know if you need pics of my trucks.

03-31-2004, 08:56 AM	#8
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	You are probably done by now, but here is a shot of the routing on one of my K20s. Attached Images

03-31-2004, 08:56 AM	#9
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	another. Attached Images

03-31-2004, 09:36 AM	#10
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Not done yet, been raining. Thanks for the pics. The brace off the front of the booster to the firewall-where does it attach on the firewall? I should have taken better pics prior to disassembly. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

03-31-2004, 09:57 AM	#11
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	I can take a picture of the brace. You will probably have to drill a hole for the brace depending on what that cab you are using had. I usually have to drill a hole for my conversions. This last one was a pain because the hole is under all of that factory sound deadening material.



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