Disc Brake Hard Lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

doc70sub · 07-06-2002, 01:39 PM

Hey guys!
I'm in the middle of a brake swap on my '70 Sub 2wd & have a question. I used all of the front components from a '74 Sub (not the crossmember however) w/ new poly bushings, calipers, rotors, etc. The probem lies in my original brake lines, which are corroded beyond use. I'd like to re-plumb the entire front of the system w/ stainless. Which lines should I order, the stock '70 style or the '71-'72 style? Everything is done, but this part & of course the alignment. Thanks!
Doc

*Fast68Chevy* · 07-06-2002, 02:42 PM

well, 71 and 72 differ from 73-80 in alot of ways so youre gonna have to make some decisions

A. 71 72 run under frame rail and 73-up run through that hole in the frame ril in front of the cradle a ways about out as far as the caliper is where the hose bolts on
B. combo valve is mounted at master cylinder on 71 72, 73-up combo valv eis mounted on the very first xmember just behind bumper,
C. 71 72 hoses and calipers differ in design at the hose connection end,.

personlly i owuld just go and buy some straight lengths and a rent an S.A.E. tube flaring kit and buy a tubing cutter which are free rental and cheap repsectively at autozone, and run them custom however you wish,

personlaly i favor 73-up calipers and a hoses, the hoses are lots longer and run out of the way and safely through the frame rails and i think cost less to boot., i have also mounted a 78 combo valve on first xmember on a 68 and routed lines like such

good luck

Mike C · 07-06-2002, 07:11 PM

When I did my disc conversion, I ordered new lines for a 71 truck from INline tube. I cut the tabs off the donor truck and welded on to the front of the crossmember of my truck. I bought remanufactured 71 calipers and new 71 rubber lines. I used the 73 and up combo valve but mounted it underneath the master. There is one extra line that needed to be plugged. This was on my 3/4 ton.

*Fast68Chevy* · 07-06-2002, 07:31 PM

yeah usually the 73-up have separate ports on the end of the valve for each front line, but usually on 71 72 ones the valve only has one port and the line T's off on the cradle somewhere either on the LH engine pad area or on the backside of the cradle

07-06-2002, 01:39 PM	#1
doc70sub Registered User Join Date: Dec 2000 Location: Thomasville, NC Posts: 669	Disc Brake Hard Lines Hey guys! I'm in the middle of a brake swap on my '70 Sub 2wd & have a question. I used all of the front components from a '74 Sub (not the crossmember however) w/ new poly bushings, calipers, rotors, etc. The probem lies in my original brake lines, which are corroded beyond use. I'd like to re-plumb the entire front of the system w/ stainless. Which lines should I order, the stock '70 style or the '71-'72 style? Everything is done, but this part & of course the alignment. Thanks! Doc __________________ 1970 Sub C-10 - 350/TH-350/3.73 12-bolt Came home from the hospital in it & mine ever since. 1966 Catalina Ventura 2-door fastback 389/TH400

07-06-2002, 07:11 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	When I did my disc conversion, I ordered new lines for a 71 truck from INline tube. I cut the tabs off the donor truck and welded on to the front of the crossmember of my truck. I bought remanufactured 71 calipers and new 71 rubber lines. I used the 73 and up combo valve but mounted it underneath the master. There is one extra line that needed to be plugged. This was on my 3/4 ton. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

07-06-2002, 02:42 PM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	well, 71 and 72 differ from 73-80 in alot of ways so youre gonna have to make some decisions A. 71 72 run under frame rail and 73-up run through that hole in the frame ril in front of the cradle a ways about out as far as the caliper is where the hose bolts on B. combo valve is mounted at master cylinder on 71 72, 73-up combo valv eis mounted on the very first xmember just behind bumper, C. 71 72 hoses and calipers differ in design at the hose connection end,. personlly i owuld just go and buy some straight lengths and a rent an S.A.E. tube flaring kit and buy a tubing cutter which are free rental and cheap repsectively at autozone, and run them custom however you wish, personlaly i favor 73-up calipers and a hoses, the hoses are lots longer and run out of the way and safely through the frame rails and i think cost less to boot., i have also mounted a 78 combo valve on first xmember on a 68 and routed lines like such good luck

07-06-2002, 07:31 PM	#4
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	yeah usually the 73-up have separate ports on the end of the valve for each front line, but usually on 71 72 ones the valve only has one port and the line T's off on the cradle somewhere either on the LH engine pad area or on the backside of the cradle



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