72 Sierra Grande Brake ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

saddletramp · 03-09-2024, 04:53 PM

Afternoon Guys I'm running new Brake lines up front on my 72 GMC half ton 3/16 Brake line I went to my local NAPA store I got 2 front hoses, line size 3/16 one hose is a 3/8 tube nut the other hose is a 7/16 tube nut counter guy couldn't tell me why I have 2 different size tube nuts any body tell me why Thanks

jessemthompson · 03-09-2024, 05:30 PM

From checking the parts on rock auto they left and right lines are different sizes. I couldn’t tell you why. I haven’t paid attention to what’s on my truck as it’s been so long ago that I replaced mine

**1970cstblazer** · 03-10-2024, 08:35 AM

They are indeed side specific:

https://store.fillingstation.com/det...KE_HOSERT.html

https://store.fillingstation.com/det...KE_HOSELF.html

Orig GM part numbers:

LEFT-6274063, 6264063, 6262737 3993921

RIGHT-6274064, 6264064, 6262738, 3993922

saddletramp · 03-10-2024, 09:34 AM

Morning Guys Thanks for your response so the 3/16 brake line tube nut size 7/16 goes on the left side front and 3/16 line tube nut size 3/8 goes on the right side why did the factory do that would it effect the braking? Thanks again

03-09-2024, 04:53 PM	#1
saddletramp Registered User Join Date: Aug 2014 Location: murfreesboro tn Posts: 291	72 Sierra Grande Brake ? Afternoon Guys I'm running new Brake lines up front on my 72 GMC half ton 3/16 Brake line I went to my local NAPA store I got 2 front hoses, line size 3/16 one hose is a 3/8 tube nut the other hose is a 7/16 tube nut counter guy couldn't tell me why I have 2 different size tube nuts any body tell me why Thanks

03-09-2024, 05:30 PM	#2
jessemthompson Registered User Join Date: Nov 2011 Location: Williamsburg, VA Posts: 960	Re: 72 Sierra Grande Brake ? From checking the parts on rock auto they left and right lines are different sizes. I couldn’t tell you why. I haven’t paid attention to what’s on my truck as it’s been so long ago that I replaced mine

03-10-2024, 08:35 AM	#3
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,858	Re: 72 Sierra Grande Brake ? They are indeed side specific: https://store.fillingstation.com/det...KE_HOSERT.html https://store.fillingstation.com/det...KE_HOSELF.html Orig GM part numbers: LEFT-6274063, 6264063, 6262737 3993921 RIGHT-6274064, 6264064, 6262738, 3993922 __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

03-10-2024, 09:34 AM	#4
saddletramp Registered User Join Date: Aug 2014 Location: murfreesboro tn Posts: 291	Re: 72 Sierra Grande Brake ? Morning Guys Thanks for your response so the 3/16 brake line tube nut size 7/16 goes on the left side front and 3/16 line tube nut size 3/8 goes on the right side why did the factory do that would it effect the braking? Thanks again



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