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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 12-22-2010, 06:13 AM
SeXcBeAsT523i SeXcBeAsT523i is offline
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Location: Brisbane Australia
 
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Mein Auto: Bmw 523i
Smile how to change e39 brake fluid

hi guys new here just got my first bm and i did an oil and filter change but now i have a clock showing up and the guy from bmw said i need to change the brake fluid how do i do that and is it hard and also pictures if possible please

cheers guys
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  #2  
Old 12-22-2010, 06:18 AM
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AnotherGeezer AnotherGeezer is offline
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Try this
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  #3  
Old 12-22-2010, 06:57 AM
ollo_ollo ollo_ollo is offline
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The above instructions are great, I would just add that for the cost of having this done in a shop, you can purchase a pressure bleeder that attaches to your brake fluid reservoir and not need an assistant. Once the system is pressurized, you just open the bleed screw on each brake until fresh fluid flows out, close the bleed screw & move on to the next wheel. Keep the reservoir topped up during bleeding. Using a different color fluid each time you bleed makes it easy to see when all the old fluid is out. Don
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  #4  
Old 12-22-2010, 07:27 AM
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Fudman Fudman is offline
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Do a search on this forum. There are positive pressure methods (pressurizing the brake fluid reservoir) and negative pressure methods (drawing a vacuum on the bleeder screw side) that do not require an assistant. Pros and cons to both methods. A fairly easy DIY, once you have the tools. Tool cost is anywhere around $30-$60, depending on brand and source. Pays for iteself the first time you use it.
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  #5  
Old 12-22-2010, 07:28 AM
KeithS KeithS is offline
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YOur going to want something like this: http://store.motiveproducts.com/euro...-0100-p34.aspx

This is the acutal maufacturer, but is sold under numerious names and prices. (It's actually a converted insesctide sprayer). I've been using one for years. You will need some hoses to direct the fluid from the wheel cylinders to a container. If your REAL good you can flush using only one quart. But make sure you have some more just in case.

If you have a manual transmission I was told a good idea to put a little hose clamp on the hose that feeds the clutch master cylinder where it's connected to the brake fluid tank. This is to prevent it from blowing off when you pressurize the system.

Last edited by KeithS; 12-22-2010 at 07:31 AM.
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  #6  
Old 12-22-2010, 07:50 AM
cn90 cn90 is offline
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No need for Motive product.
Invest in a small air compressor (such as 1-2 gallon compressor), so you can use it to inflate your tires and guess what? You can use the compressor for brake bleeding too. I wrote a DIY here using compressor. They key thing is keep tank pressure at 10-15 psi and no more than that.

DIY: 1-man Hydraulic Bleeding Kit for those with Air Compressor!
http://www.bimmerfest.com/forums/sho...d.php?t=392957
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  #7  
Old 12-22-2010, 07:52 AM
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AnotherGeezer AnotherGeezer is offline
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Quote:
Originally Posted by cn90 View Post
No need for Motive product.
Invest in a small air compressor (such as 1-2 gallon compressor), so you can use it to inflate your tires and guess what? You can use the compressor for brake bleeding too. I wrote a DIY here using compressor. They key thing is keep tank pressure at 10-15 psi and no more than that.

DIY: 1-man Hydraulic Bleeding Kit for those with Air Compressor!
http://www.bimmerfest.com/forums/sho...d.php?t=392957
I did the same thing while working on my exes 1957 Ford. Worked like a dream!
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Old 03-05-2012, 05:57 PM
mjbennett9 mjbennett9 is offline
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Hi guys, I know this is a fluid change thread, but I'm not having much luck searching google, or bimmerfest.

Bavarian Technic says it's code 81 (Pressure Sensor Lead). I tried the DMM but since I live alone, it's too much. I am assuming the sensor is in fact bad. However, searching for a repair/replacement DIY for the pressure sensor seems to be as elusive. I've been googling and searching the forums, but have yet to find a DIY on pressure sensor replacement. Anyone replace a brake pressure sensor on a 2002 e39 525i before? Not sure if I need to just unplug 3 wire connector, unscrew, screw new one in (torque?), plug connector in, and off I go?

Sensor will be here Wednesday. I'll hopefully replace it after work, and I leave for Boston Thursday night. I'm hoping this gives me my ABS back for the wintery drive East. FYI, I've already replaced the ABS/DSC module with an ATE rebuilt module :-)

Last edited by mjbennett9; 03-05-2012 at 06:02 PM.
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  #9  
Old 03-05-2012, 07:43 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by mjbennett9 View Post
I've been googling and searching the forums, but have yet to find a DIY on pressure sensor replacement. Anyone replace a brake pressure sensor on a 2002 e39 525i before? Not sure if I need to just unplug 3 wire connector, unscrew, screw new one in (torque?), plug connector in, and off I go?
About two years ago, I documented that Carsoft gave me a code for the brake pressure sensor, which, turned out to be bogus. It was my ABS control module.

But, since I never replace anything without testing it first, I learned how to test the brake pressure sensor and wrote it up, with help from the team, over here:
- ABS BRAKE DSC trifecta brake pressure sensor diagnostic test DIY (1)

Since you're replacing yours, it would be very nice for the team if you can run the tests listed and report back what you find for the old and new sensor.

Also, if you can add to that thread how to remove and replace the BPR, that would be nice (I don't know offhand of a BPR R&R DIY ... but I didn't look for one).
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 03-05-2012 at 07:46 PM.
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  #10  
Old 03-05-2012, 09:09 PM
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champaign777 champaign777 is offline
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I hate to mess up with a bleeding

I just suck what even I can from brake fluid reservoir twice in a year and add a fresh DOT4.
Together with a steering ATF fluid
Usually take no more than 30 min for both

GL
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Last edited by champaign777; 03-05-2012 at 09:15 PM.
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