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Joined: Aug 2018
Posts: 46
D
Wrench Fetcher
Wrench Fetcher
D Offline
Joined: Aug 2018
Posts: 46
Do 1/2 ton and 3/4 ton trucks use the same diameter brake lines?

I am asking because my truck is a half ton long box and all the brake line kits I found are for half ton short boxes or 3/4 ton long boxes. Any insight would be appreciated thank you.


1950 GMC 1/2 Ton Long Box
228-Zenith carb- SM420-bendix brakes
Joined: Jun 2011
Posts: 5,096
E
Crusing in the Passing Lane
Crusing in the Passing Lane
E Offline
Joined: Jun 2011
Posts: 5,096
The tube diameter does not matter, master bore size and wheel bore size are what matters.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Joined: Aug 2018
Posts: 46
D
Wrench Fetcher
Wrench Fetcher
D Offline
Joined: Aug 2018
Posts: 46
Thanks, I get that,. But what I am really asking is if the hard lines for a 3/4 ton long box will fit my half ton long box.


1950 GMC 1/2 Ton Long Box
228-Zenith carb- SM420-bendix brakes
Joined: Jun 2011
Posts: 5,096
E
Crusing in the Passing Lane
Crusing in the Passing Lane
E Offline
Joined: Jun 2011
Posts: 5,096
Could be, I always make my own, then I get exactly what I want.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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