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Old 10-20-2019, 08:52 PM
Join Date: Jun 2014
Location: Omaha, NE
Posts: 1,321
cn90 is on a distinguished road
How wash salt off brake line?

Hello all,

After I replaced about 30 inches of the 2 rear brake metal lines (under driver's area), I inspected around and the rest of the metal lines (from the Left Rear passenger area to both wheels) are fine without any rust.

However, there is white salt deposit on the rest of the lines.
NO RUST at all as the protective coating is still intact.

I washed with garden hose but the white stuff is still on the lines.

Questions are:

1. The white coating by salt on top of an otherwise intact factory coating: can the white coating attacks the coating?

2. How do you wash this white stuff off?
I rubbed on it but it appeared to be hardened onto the line.

So far I am not too worried because:

1. I see no rust on the rest of the lines.

2. Worst come to worst...I will replace with Ni-Copp line all the way from the union under driver's area ---> to each wheel caliper.
1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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Old 10-21-2019, 09:37 AM
Join Date: Jun 2013
Location: Virigina, USA
Posts: 2,135
StephenVA is on a distinguished road
That white phosphorous powder is actually the chemical reaction of the steel lines to exposure. If you take a 3M Scotbrite pad (Green ones) to it it will come right off. You will then need to coat it with something to stop further corrosion. There are lots of posts on the subject with in the "Brake Lines" topics.

Replacement is the only long term solution as you are in the rust belt. See your option #2 of end to end replacement.

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Old 10-21-2019, 02:26 PM
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Join Date: Jun 2015
Location: Racine, WI
Posts: 5,084
andrewwynn is on a distinguished road
I had zero corrosion on the crossover pipe above the rear axle so I saw no reason to replace that part. The main two lines however looked like they were fabricated out of rust.
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
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