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  #1  
Old 04-19-2019, 11:19 PM
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Rusty brake line

Gotta love BMW and their neat routing for hoses and hard lines. Traps dirt and moisture then rusts out the steel line. This is the rear brake line on our lower mileage X5. And yes, the stain is brake fluid. Other side is rusty but still dry.
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Old 04-19-2019, 11:34 PM
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Just wait until you run in to the fun waiting for you under the front driver side floor... plastic cover traps debris against the brake lines and rust them out there something fierce!

If yours havenít failed there yet, pull the cover and do what you can now to try and salvage them... or just replace them now so you donít have that sinking feeling at 65 mph on the outer belt...
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Old 04-20-2019, 12:06 AM
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This is why I rinse the chassis with water (at the self-serve car wash $2/time)
in the winter whenever temp is above 2-3C.

In April, I wash the chassis with garden hose. Rust accelerates in the hot months of June July Aug.

Don't blame BMW. It is lack of maintenance by the owner.
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Old 04-20-2019, 12:10 AM
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Quote:
Originally Posted by cn90 View Post



Don't blame BMW. It is lack of maintenance by the owner.


Oh come on.... I had a Ford F-150 that I ran in everything but good weather and the brake lines never failed on that beast... over 260,000 miles of sand, mud, snow and crap on that truck.

That said, I do agree that a good power wash is a good thing every now and then, but ďhidingĒ the brake lines under that cover that really doesnít let them air out was kind of a silly move... just saying...
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Old 04-20-2019, 12:10 AM
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I will be an expensive mistake.

We wash salt from our concrete driveway in the Spring to minimize damage to the concrete.

Every car is different Volvo, BMW, Ford etc.

Salt is corrosive to many materials: steel, aluminum, concrete etc.

My 1998 528i chassis is now 22 years old and it looks pristine underneath...
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Last edited by cn90; 04-20-2019 at 12:22 AM.
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Old 04-20-2019, 12:15 AM
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Was honestly something that I never thought much about until it jumped up and bit me in the butt... and I bet Iíve owned 40+ cars (this is the only one Iíve ever had a brake line failure on I will add)

Now that I have them fixed I actually drilled out my cover so that I could flush that channel every once and again and keep an eye on them... now

I also sprayed them with a healthy dose of rust inhibitor!
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Old 04-20-2019, 02:07 AM
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Oh, I'm well aware of the lines under the floor. I'm looking there as well. Will I find problems? I'll let all y'all know.



But calling this issue 'lack of maintenance' is just wrong. You'd have to pull the wheels, un-clip that cover, and wash out the dirt a couple of times per year. Had BMW simply used open clips to secure those lines (3 on the passenger, 2 on the driver side), dirt wouldn't accumulate to trap moisture. Just a bad design. And without removing the cover from the underfloor area, would rinsing it even get out the crud?


.
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Old 04-20-2019, 09:06 AM
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- We change engine oil, we replace spark plugs. Washing the car is routine maintenance.

- The TRICK for the big shield...

- In the DIY Fuel Filter I wrote a while ago, I showed the photo of a hole I drill in the big cover. This allows me to get a garden hose (no pressure washer!), and spray water up there a few times a year, especially in the Spring. TRUST me, this makes cleaning the brake lines a snap!!!

- Detail below how how to drill a hole large enough for the garden hose:

https://xoutpost.com/bmw-sav-forums/...-filter-4.html



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Old 04-20-2019, 09:29 AM
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That is an extraordinarily clean undercarriage cn90.
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Old 04-20-2019, 10:09 AM
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Quote:
Originally Posted by Overboost View Post
That is an extraordinarily clean undercarriage cn90.


+1 to that!

I thought I kept mine relatively clean but that is amazing!

And exactly what I did, I actually drilled a few more along the bottom as well to allow water to flow through it better and drain
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