Thread: brake line and portioning valve question

i am working on my 2000 grand prix gtp. i had to replace the driver side brake line about 1/2 way down the car through the portioning valve and back to rubber hose. i replaced the line on both sides of the portioning valve, i had no choice it was rotted badly. i used a standard flaring tool. i tightened it down really good but it still leaks bad. i dont think GM used a standard flare inside the portioning valve. how do i fix this thing? can i buy a special tool to make the proper shape of the flare? i had to re-use the old fitting because the new fittings i had that i was using everywhere else were not same size as what was on the portioning valve.

what is the correct fitting? i know its not the same as the other fittings. when i bought line i bought a coil if it, make and bend my own lines not buy the straight lengths they sell. as far as the line itself i am only replacing it up to where the line is solid again. the car isnt really rotted but it will be after a few more winters. winters around here are aweful. the car runs and drives fairly well so i just want to keep it going for a few more year. my summer vehicle is a 1996 camaro Z28 and i gotta have something to drive in the winter. hence i really dont want to spend too much time or money on the grand prix. i like these cars but if the vehicle is rotted or starting to get rotted i wont spend too much time or effort on it. in this climate rusted out junk is everywhere and its barely worth fixing. if it was a super clean example sure i would spend all the time and money and replace the entire line the whole length. in the future i might buy another GTP but a cream puff, and part out my current car.

at any rate thanks for the info i think i used the wrong type of flare. i usually dont replace brakes lines and try to get rid of a car before they go bad, if the brake lines are shot typically the rest of the car is also starting to get rotted