3/4 ton and 1/2 ton Hard brake lines the same? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nodnarb76 · 08-24-2020, 08:38 PM

I’m in the process of replacing the brake lines on my 87 R20 Suburban.
I only need the front lines. I contacted LMC and they said they could not guarantee their 1/2 ton lines would fit my 3/4 ton truck. Would they be the same? I am talking about the pre-bent hard brake lines from the proportioning valve to the rubber brake hoses.

SCOTI · 08-25-2020, 09:23 AM

Quote:

Originally Posted by Nodnarb76

I’m in the process of replacing the brake lines on my 87 R20 Suburban.
I only need the front lines. I contacted LMC and they said they could not guarantee their 1/2 ton lines would fit my 3/4 ton truck. Would they be the same? I am talking about the pre-bent hard brake lines from the proportioning valve to the rubber brake hoses.

The prop valve is in the same spot (drivers front corner of the splash apron/x-member) & the lines connect through the frame in the same areas so if I were betting I would say they will work.

**hatzie** · 08-25-2020, 10:48 AM

Likely the same diameter hardline and fittings. The length of the hardlines and the hoses may be slightly different.
The difference in the systems is the booster, diameter & stroke of the master cylinder, diameter of the caliper pistons, and diameter of the wheel cylinder pistons.

If the LMC lines are steel I'd look in another direction.
You want Stainless or Ni-Copp line.

v30crewcab · 08-26-2020, 08:19 AM

They are the same.

Nodnarb76 · 08-26-2020, 10:48 AM

Thank you everyone for the help.
This forum is the best!!!!

08-24-2020, 08:38 PM	#1
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	3/4 ton and 1/2 ton Hard brake lines the same? I’m in the process of replacing the brake lines on my 87 R20 Suburban. I only need the front lines. I contacted LMC and they said they could not guarantee their 1/2 ton lines would fit my 3/4 ton truck. Would they be the same? I am talking about the pre-bent hard brake lines from the proportioning valve to the rubber brake hoses. __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824

08-25-2020, 10:48 AM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 3/4 ton and 1/2 ton Hard brake lines the same? Likely the same diameter hardline and fittings. The length of the hardlines and the hoses may be slightly different. The difference in the systems is the booster, diameter & stroke of the master cylinder, diameter of the caliper pistons, and diameter of the wheel cylinder pistons. If the LMC lines are steel I'd look in another direction. You want Stainless or Ni-Copp line. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

08-26-2020, 08:19 AM	#4
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 982	Re: 3/4 ton and 1/2 ton Hard brake lines the same? They are the same. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

08-26-2020, 10:48 AM	#5
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	Re: 3/4 ton and 1/2 ton Hard brake lines the same? Thank you everyone for the help. This forum is the best!!!! __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824

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