|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Did my brake fluid overheat?
|
|
02-08-2020, 04:08 PM | #1 |
Major General
2659
Rep 6,290
Posts |
Did my brake fluid overheat?
I was drifting last night and throwing the car around in the snow and after my last donuts I parked it the clutch pedal wouldn't go back up.
So at first thought my slave or something like that broke and leaked. Fluid level looked ok. I let the car idle a bit and after that all was working fine. My questions are what exactly happened? What component did overheat to make it act like this? Because clearly nothing is actually broken right if all works now. My brakes also were working fine when issue occurs and still are. If the fluid was overheated wouldn't the brakes be full of air? Or could the fluid have heated up enough only maybe in the lines near the transmission to cause issues to clutch component but not to brakes? |
02-09-2020, 09:16 PM | #2 |
Major General
2659
Rep 6,290
Posts |
I threw the car again tonight in a parking lot and similar issues. I wasn't even that hard on it.
Got a DCS (or ABS I think, yellow park light warning) warning disabled and also FTM error and my clutch pedal was starting to feel pretty stiff. Is my clutch just over heating or what is over heating? Again, car feel perfectly good after wards of sitting. |
Appreciate
0
|
02-10-2020, 12:29 PM | #3 |
Colonel
705
Rep 2,605
Posts
Drives: 06 330i E90, 18 530xe G30
Join Date: Dec 2010
Location: Toronto
|
It doesn't make sense that the boiled brake fluid would anywhere close to the clutch line. Typically the fluid would boil in the caliper first. You'd have straight up set your car on fire for that temp to make its way back clutch line fluid. I'm a bit perplexed to the cause of the issue too, just thought I would throw in my 2 cents worth.
|
Appreciate
0
|
02-10-2020, 01:19 PM | #4 | |
Major General
2659
Rep 6,290
Posts |
Quote:
Other thing is maybe there is air in the clutch lines? But then again, how would that heat up in the first place. I'm not using my brakes when doing a donut or drift in snow. |
|
Appreciate
0
|
02-10-2020, 01:25 PM | #5 | |
Colonel
1207
Rep 2,026
Posts |
Quote:
When drifting around it's possible the master cylinder sucked in some air from the fluid sloshing around in the reservoir. Same issue with oil in your sump and power steering fluideven. Fluids can cavitate and then be pumped through systems. It's possible this could be the issue or a master/slave pulling in air. I'd think you would have external leak too though if that were case. You can cheat behind the clutch pedal for wetness. |
|
Appreciate
0
|
02-10-2020, 01:28 PM | #6 | |
Major General
2659
Rep 6,290
Posts |
Quote:
If air was indeed sucked in, wouldn't my pedal not return to normal behavior though? Clutch or brake wise? |
|
Appreciate
0
|
02-10-2020, 01:30 PM | #7 |
Brigadier General
3058
Rep 3,910
Posts |
Nothing in the brakes affects the clutch, if the fluid level is good.
I'm guessing you'll be needing a new clutch release bearing soon, or something in that area. |
Appreciate
0
|
02-10-2020, 01:30 PM | #8 | |
Colonel
1207
Rep 2,026
Posts |
Quote:
|
|
Appreciate
0
|
02-10-2020, 02:16 PM | #9 |
Brigadier General
1552
Rep 3,475
Posts
Drives: E90 6MT FBO; '18 F150 Platinum
Join Date: Jul 2013
Location: WI
|
I'm fairly certain the car is constantly applying brakes when drifting for the ediff, at least in my xi it smells like hot brakes when I finishing messing around in the snow, and I don't use the clutch obviously.
__________________
2008 335xi 6MT | VRSF Catless DP | VRSF 7" FMIC | VRSF CP | TIAL BOV | DCI | MHD 2+ BC Racing BR | Stoptech 600 | Firehawk Indy 500 255 Square | Atric Altimax 225 Sq. 2018 F-150 Platinum 701A | FX4 | 3.5 EcoBeast |
Appreciate
0
|
02-10-2020, 02:37 PM | #10 | |
Brigadier General
3058
Rep 3,910
Posts |
Quote:
Yep, the e-diff will be working hard when doing that, and putting heat into the rear brakes. I just can't see that affecting the clutch unless the reservoir is sealed. Could be wrong though, as ever! |
|
Appreciate
0
|
02-10-2020, 03:34 PM | #11 | ||
Major General
2659
Rep 6,290
Posts |
Quote:
Quote:
Ohhhhhh shit you guys are right I forgot about that. It still works when traction is off. That explains the brake error I got. But yeah the clutch pedal remains a mystery. |
||
Appreciate
0
|
02-11-2020, 11:14 PM | #12 |
Major General
4276
Rep 9,206
Posts |
Slave cylinder. Is plastic. Gets hot from engine and transmission. Brake error is from rear wheels spinning lot faster than front. Nothing with brakes. All cars get these on dyno runs.
|
Appreciate
0
|
02-12-2020, 12:51 PM | #13 |
Major General
2659
Rep 6,290
Posts |
|
Appreciate
0
|
Bookmarks |
|
|