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#1 |
Registered User
Join Date: Oct 2014
Location: Chattanooga TN
Posts: 75
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What size hardline for disc brakes up front?
I've done a little digging and have read that drum brake trucks have 1/4" line all around and disc brake trucks have 3/16" line up front and 1/4" out back. My truck is a 70 model that someone has put discs on up front but front lines go through a tee fitting from the MC to 3/16" line and then use adapters on the hoses to go from 7/16-24 flare fitting (for 1/4" tube) to a 3/8-24 (for 3/16" tube). I'm about to re-build my brake lines and trying to figure out which I should be using?
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#2 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,717
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Re: What size hardline for disc brakes up front?
I always use 3/16" hard line for disc brakes.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#3 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,334
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Re: What size hardline for disc brakes up front?
My thinking is for the front circuit each side has it's own line, so smaller 3/16" is OK. The rear shares a line, so gets larger 1/4" until the tee.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#4 |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: What size hardline for disc brakes up front?
Ive done several disc retrofits , and what the factory had for drums , worked fine for discs
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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#5 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,717
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Re: What size hardline for disc brakes up front?
And I've run 3/16" hardline to the rear for drum brakes without issue.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#6 |
Registered User
Join Date: Oct 2014
Location: Chattanooga TN
Posts: 75
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Re: What size hardline for disc brakes up front?
Thanks guys! I ended up making them out of 3/16" because it's what I had on hand and using the adapters for the hoses, I was just confused why there were adapters at all in there.
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