Thread: Brake Leak Near Fuel Filter, Proportioning Valves and Lines...

you'll need to get under there and see whats leaking. more them likely its a line. i used a small hacksaw to cut the old line. mine was the one that runs across the rear sub frame and it was beat so i replaced the whole thing from a clear area to cut and wrench on the compression fittings.

compression fittings work, but renting or owning and flairing the lines and using line nuts and all is the preffered way to change a chunk of line.

you can buy new lines but most of us just cut out the rusted area and replace it with new tube.

i had to cut my line in the driver side wheel well and in the same place by the pass side, then run a new line across the back of the car.

the compression fittings cost like 3 or 5 bucks for 2, and the line, 48 inches cost like 15. shorter lines cost less of course.

if you go with the compression fittings, sand the old tubing smooth and clean. then cut the pipe so the compression fitting slides on nice and easy. after its cut its a fight to sand it smooth. with fluid leaking out the end of it and all.

if you see a burr inside the cut edges, use a sharp knife and clean the inside out, you dont want metal chips in the caliper.

Re do them all, 50' nickle copper lines, couple box's of fittings, bubble and double flare tool and a long afternoon and walla.

Piecing in a line you need to find where the line isnt rusted to hell and cut there and run that line to the valve, assuming you can get the valve fitting off without twisting the other line off (vise grips and soak soak soak)

Old to new




Double flare for the threaded coupling/union


If you can find a hand held hydraulic flaring tool get that

yeah, thats the right way.^^^^^

but when its cold and your in a pinch the compression fittings work well. i had that line cut out and replaced in less then 30 minutes, thats brakes bled and all.

mine sat for 2 days and it leaked all over the f ing place, the res was also dry. the lines holds fluid and can leak still after you cut it. id put a pail under it, or a drain pan, hell even cooking tin and a rock to hold it there to save your driveway.

good thing mine was in the public park lot lol i see that stain daily still.

14 years old? those lines owe you nothing, there life has been well used with all the salt up here.

a friend of mine picked up a used 2003 or 4 Chevy 4x4 truck, the week he got it the lines blew out on him too.

ive been pretty much waiting for one of mine to blow. they all have some crusty rust on them. i knew it was a matter of time before i had to chop up the lines.

they seem to like to rot out in the front wheel well where they pass the sub frame, and along the driver side bottom of the car. and in my case the rear sub frame line was so shot. thats the pass side rear caliper line.