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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-09-2011, 01:10 PM
Froemis7 Froemis7 is offline
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Help with brakes and brake fluid.

Today all of a sudden after reversing out of my car spot and putting it in drive my breaks started barely working. I had to push it all the way down to get any sort of response from my brakes. Could it be the fluid? If so can you show me a picture of where the resevoir is? I cant seem to find it. What color is the fluid? The place I think it is the fluid is greenish. SOrry I dont know much!

edit: its a 2001, idk if that helps at all

Last edited by Froemis7; 12-09-2011 at 01:14 PM.
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  #2  
Old 12-09-2011, 01:42 PM
Froemis7 Froemis7 is offline
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Any information would be helpful. It is kind of urgent. Im hoping to figure out if its a quick fix or if I need to put it in the shop before all the shops close. TY!
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  #3  
Old 12-09-2011, 01:46 PM
pleiades pleiades is offline
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The brake reservoir is hiding under the drivers' side cabin filter housing and you have to remove the housing to get to it. A couple of clips and some plastic clips on the vent duct that you can bend (carefully) with your fingers or a key.

You have to unplug the hood sensor as well... Make sure to put everything back properly.

Fluid is DOT 4 but if this is a sudden event, you have a leak somewhere.
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  #4  
Old 12-09-2011, 01:58 PM
Froemis7 Froemis7 is offline
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It happened once before about a week and a half ago but it fixed itself after my car was off for like 5-10 min
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  #5  
Old 12-09-2011, 02:03 PM
Froemis7 Froemis7 is offline
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Brakes

My brakes pads and rotors have needed to be replaced for about a week now because of a grinding sound. could that be the cause or could it be causing it to drain fluid. I cant see a leak.
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  #6  
Old 12-09-2011, 02:51 PM
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doru doru is offline
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Check the brake booster for leaks.
Also if water entered (sucked in) in the brake booster, you have the same condition you describe. The brake booster is under the driver side cabin filter (removal has been explained above). The water intake of the brake booster is due to the cabin filter drains getting clogged. Also, once water in the brake booster it can freeze.
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  #7  
Old 12-09-2011, 04:09 PM
Froemis7 Froemis7 is offline
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How would I get it out of there?
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  #8  
Old 12-09-2011, 04:10 PM
Froemis7 Froemis7 is offline
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If brake fluid is infact the problem, can I just add it myself? I heard you have to bleed something.
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  #9  
Old 12-09-2011, 04:22 PM
d geek d geek is offline
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You don't run out of brake fluid unless there is something serioiusly wrong. Get your car to a knowledgable mechanic pronto!
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  #10  
Old 12-09-2011, 09:28 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by Froemis7 View Post
can you show me a picture of where the resevoir is?
Going to this thread for a picture ...
- Getting to know your M54 engine, a photo & identification guide to every visible part in the engine bay (1)

I was surprised 'not' to see a picture of the brake master cylinder.

So, I went to this thread:
- One user's example of a complete brake job with all torque figures, specs, measurements, fluids, decisions, tools, tricks, mistakes, suppliers, costs, etc., that it entails (1)



So that others find this easier in the future, I'll add it to the thread with pictures for all parts of the engine bay.
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  #11  
Old 12-09-2011, 10:35 PM
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doru doru is offline
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Read through this, here is the brake booster.
And make sure no air gets in the ABS (moar reading).
__________________
Looking for a DIY? Parts? Check this out, it might be your ticket
TMS underdrive pullies - Stewart WP - PSS9 - Beisan Vanos seals - Zimmerman cross-drilled & Akebono Euro - Deka 649 MF - 55w HID headlights - 35w HID foglights - Hualigan double din - ACS (rep) alu pedals - Euro central storage console - Breyton Magic Racing staggered wheels - M5 bumper - M5 steering wheel - Tint
Stable: e39, e53, e46 & Tribby

Last edited by doru; 12-09-2011 at 10:38 PM.
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  #12  
Old 12-10-2011, 05:52 AM
Froemis7 Froemis7 is offline
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I turned on my car today. Don't really know why, kinda hoping a miracle had fixed it. But the brake light on the dash was red. Does this narrow down the problem at all?
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  #13  
Old 12-10-2011, 06:53 AM
d geek d geek is offline
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Tow it to a mechanic. Brakes are nothing to take chances on.
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  #14  
Old 12-10-2011, 09:39 AM
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doru doru is offline
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If the brakes lights are red, don't drive it - your brakes have failed catastrophically. If you don't know how to fix them (and I am 100% sure it has something to do with your brake booster, and maybe with the ABS as well), you are better off to go to a mechanic. Don't cheap out. I am afraid this will be an expensive one.
Keep us posted.
__________________
Looking for a DIY? Parts? Check this out, it might be your ticket
TMS underdrive pullies - Stewart WP - PSS9 - Beisan Vanos seals - Zimmerman cross-drilled & Akebono Euro - Deka 649 MF - 55w HID headlights - 35w HID foglights - Hualigan double din - ACS (rep) alu pedals - Euro central storage console - Breyton Magic Racing staggered wheels - M5 bumper - M5 steering wheel - Tint
Stable: e39, e53, e46 & Tribby
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  #15  
Old 12-10-2011, 02:29 PM
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Trebbia Trebbia is offline
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Remove the filter plastic and take a good look with your eyes and hands.

If you don't see the problem within ten or twenty minutes, take it to a mechanic.

If the problem isn't obvious by your inspection, it's beyond what you can do safely.
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