Proportioning Valve 12" Section Of Hardline If your going to install your adjustable proportion valve according to our recommended installation procedure you will need these hairlines. 1 x 12" Section and 1 x 18" section Of Hardline. This will go between your master cylinder and the adjustable proportion valve. Or under the rear of the car to turn down the rear brakes. This system works on most cars with metric m10x1.0 threads (found on most Japenese cars). 1 section of hardline has an inverted flare and the other side has a bubble flare. The second hardline has 2 inverted flares.
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