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BMW 3-Series (E90 E92) Forum
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Rear Right Leak
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04-09-2021, 08:41 AM | #1 |
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Rear Right Leak
Hi all,
I have a 2009 LCi 325d that is leaking on my drive. It’s not a fast leak but it’s definitely enough to leave a puddle! Can anyone help identify it from the below video. Thanks in advance! (Not sure how to embed the video). https://youtube.com/shorts/1bcczBXSn5E?feature=share Cheers |
04-09-2021, 01:39 PM | #4 |
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What color is the fluid? (soak some up using a white paper towel)
Have you noticed any lowering of the level in the brake fluid reservoir? Off the top of my head, the only fluids in that area are (MAYBE) brake fluid, fuel, and shock absorbers, so try to see if you can narrow it down any further based on the color or smell.
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2008 e90 335i 6spd 2011 e90 335xi 6spd 2011 e70 x5 diesel 2010 Ducati Monster 696 Last edited by jwalker87; 04-09-2021 at 01:42 PM.. Reason: Just noticed the model in your profile - replaced 'gasoline' with 'fuel' :) |
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04-09-2021, 01:55 PM | #5 | |
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The car seems level haven’t noticed anything nor have my mechanics mentioned anything (this leak has been here for a long while). Brake fluid level is rock solid, doesn’t have a smell really and shocks are completely dry! I’m stumped haha |
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04-09-2021, 03:03 PM | #7 |
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04-09-2021, 03:10 PM | #8 |
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Could be your shock. This happened on both of my rear shocks a few years ago, 2 months apart. I went in the garage and noticed fluid on the floor, looked like used engine oil. Ended up being broken shocks.
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Dave92N54525.50 |
04-09-2021, 03:32 PM | #9 |
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I’ll have a closer look tomorrow but I’m almost certain the shock body is dry. Where the wet patch is is quite a ways from the shock itself
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04-10-2021, 01:54 AM | #11 | |
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As for the subframe yeah I did notice that around the hole? I’m pretty sure it’s a crack in the factory under seal where it’s about to flake off but will double check this aswell. |
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04-10-2021, 05:59 AM | #12 |
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Have you checked the level in the brake master cylinder. There is a lot of oil - if it was that, it should be lower. Very odd spot. Probably not gas, since this seems oily and you would get a strong smell of gas. Good luck tracking it down
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04-10-2021, 08:23 AM | #13 | |
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All anyone is doing is guessing. To diagnose it you'll need to touch a sample of it to determine why type of liquid it is. Perhaps find a small plastic cup and place it under the area of the car where you think it is leaking from to capture some of the fluid. A simple inspection of the brake piping (hard line and hose) will show signs of brake fluid leaking. Same for the caliper, it can only leak from the bleed screw, piston seal, or where the brake hose threads in to the caliper. The only other sources of liquid at the right rear are gasoline (where the filler hose comes down from the filler neck), the right rear shock (the oil would drip from the shock body out of the piston seal), and perhaps the battery if it has been leaking, or maybe over-charging and the acid is coming from the vent pipe that drains out from the battery box in the right rear. I guess rusted water since you stated the brake fluid level is full and there is no oil on the shock absorber and because the rear subframe has a lot of rust on it (and probably inside it); the subframe seems to have cracks emanating from the production tooling holes. I hope you find the source.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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04-10-2021, 08:27 AM | #14 |
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This interminable series of speculations could have been answered in 2 seconds with a taste test.
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04-10-2021, 08:33 AM | #15 |
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I bet it'll taste like rusty water
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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04-16-2021, 11:26 AM | #16 | |
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Thanks for the rest of the helpful stuff. Once again, it isn't rusty water That wouldn't leave a patch on my drive for months on end would it. |
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04-16-2021, 11:36 AM | #17 |
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Okay all, thanks for the helpful info so far. Here's is an update.
I checked under the car again and gave everything a clean. For everyone concerned about the cracked subframe. As I stated in a previous comment it is not cracked. Here in the UK the cars are undersealed from factory. This underseal cracks over time and water, grit and salt get in underneath. Hence the surface rust. I brushed away all the loose underseal and sprayed the area with rust converter, primer and finally some black paint. I cleaned up the wet area and went back to find a clearish oily feeling liquid with little to no smell. If anything it smelt a little oily but thats it. No diesel. Once again, the brake fluid in the reservoir isn't and never has budged. Still confused haha. Will get the mechanics to check next time it's in. I was hoping someone would see this and immediately know the answer but clearly I was wrong! Any way thanks to all who have been constructive so far! It's much appreciated. |
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04-16-2021, 01:33 PM | #20 | |
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OP: Has this happened even during very dry periods?
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04-16-2021, 08:08 PM | #21 | |
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LFOL. Last edited by Efthreeoh; 04-16-2021 at 08:17 PM.. |
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Dave92N54525.50 |
04-27-2021, 05:42 AM | #22 | |
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It’s not water. |
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325d, bmw, e90, lci, leak, rear, rhd |
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