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Old 12-11-2019, 01:33 AM   #1
b-mac
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Join Date: Mar 2014
Location: Wichita
Posts: 516
Brake line flaring sizing help

So my oem s10 master cylinder has two different fitting sizes on the outputs. Maybe 7/16 for the front, and 3/8 for the rear.

I'm using an aftermarket adjustable proportioning block that uses all 3/16 fittings. I have 3/16 line.

My question is, can I bubble flare the 3/16 line, and use this (pic below) 3/8 fitting that seems correct, or will I have trouble with the bubble seating? Same question for the even larger 7/16, but I did find a brass adapter from 7/16 to 3/16 that should work.
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