Hello!

My father suggested getting brake lines with pre-cut to length with metric flanges and fittings, just to make sure it's proper. So long as the bill for the parts is under $50, I'm fine with this option.

That said, I need to order them a particular length and I'm not sure what length that is. These will be the rear two brake lines on a 99 e320 w210 chassis.

Any help is appreciated!

Here is the help you need. Tell your father there is a better way. Just click on "PARTS" here on the top of this page and follow it to your car model, then to brake section, then it lists all the hoses. It does not give the length, (about 13 inch) but it does give the price as $8.75 each. That would be the "smart" way to get them. Your life my depend on it!

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Junqueyardjim
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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Sorry for the miscommunication, but I actually need the lines from front to back as they are rusted.

I already have stainless steel hoses (:

The max length sold at the parts store are 6 ft, the run from front ABS pump to rear wheels is close to 14 ft.

You can buy 2 long lines with metric bubble fittings (tell the guy at the shop you need european fittings line with metric nuts) - these new fittings are to be used on the pump and slave side.

for joining the two lines buy a union and a couple of double flare nuts (same autoparts shop would have them for cheap (less than a 5)

rent a flaring tool from the parts store along with cutter and cut the line to size, install the double flare nuts and flare the end. then install on the car. look at youtube to get ideas of how to bend the line without tools

For easy flaring use a dab of silglyde grease.

Some NAPA shops with actual repair/machine shops attached to them (or a decent indy mechanic shop) will make you a flare for a dollar or so each or in exchange for donuts too . If you can find such a shop then just measure the length required and buy the line from that NAPA along with the line nuts and have them flare it. Then all you need to do is bend the line to shape and install it.

tip:
buy a line wrench or a plumbers pipe wrench or some really good and sharp locking pliers because those line nuts would be frozen to the fitting pretty good.

I would suggest you very closely inspect all the lines, use a wire brush and blade scraper tool to inspect as if you have one rusted line, the chances are that the rest are in the same shape. (my first brake line job on a car was an avalanche of failure - I would repair one and the next would pop - I learnt that the hard way to repair brake lines all in one job.)

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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)