Brake line size? From proportioning valve to rear
Thread Starter
Joined: Nov 2005
Posts: 2,346
Likes: 1
From: Naples, FL
Car: 91 RS Camaro, 75 L82 Corvette
Engine: LO3, 383 Stroker
Transmission: 700R4, TH400
Axle/Gears: 4th gen 3.23 posi/LS1 discs, stock
Brake line size? From proportioning valve to rear
Hey guys, I'm having trouble flaring the brake line that goes from the proportioning valve to the rear. It had a rust hole so I bought a 1/4 inch line, bent it and had no problems flaring it. I'm planning on using a union to connect it to the line on the car. But I've tried 3 different flaring tools and I cannot get it. The line seems to be slightly smaller than 1/4 inch. Could it be a metric brake line?
Supreme Member
Joined: Jul 2007
Posts: 1,293
Likes: 6
From: Howard Lake, MN
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: Brake line size? From proportioning valve to rear
the stock hardlines could very well be a slightly smaller metric line, but i've found that the oem lines are just plain harder to flare than the lines you get at the parts store. they seem to be made of a harder material that a cheap flare tool might not be able to bite into to hold in place as you flare it.
Joined: Aug 2006
Posts: 12,812
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Brake line size? From proportioning valve to rear
The lines are all metric after 84 or so. 6mm
Thread Starter
Joined: Nov 2005
Posts: 2,346
Likes: 1
From: Naples, FL
Car: 91 RS Camaro, 75 L82 Corvette
Engine: LO3, 383 Stroker
Transmission: 700R4, TH400
Axle/Gears: 4th gen 3.23 posi/LS1 discs, stock
Re: Brake line size? From proportioning valve to rear
I ended up running a whole new lin from front to back.
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