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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 03-31-2011, 07:33 AM
DAvEyStRiNgS DAvEyStRiNgS is offline
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Help! ABS leak no brakes!

Hi all - my dad was complaining about bad brakes on his e39 1997 540i ... i took a look last nite and pumped the pedal with engine off and it didnt firm up, so i suspected master cylinder leak.

On investigation i found that there is some sort of valve mounted on the ABS hydraulic unit, into which the main feed from the master cylinder is fitted.....

there are 3 little holes on the under side of it and it is leaking fluid from them.... on pumping the pedal u get lots of sucky noise coming from it....

does anyone have any idea wat this part even is? some sort of pressure regulator? scoured the brake diagrams on real oem and lots of searching on forums but still no idea what it is....

only markings on it is the number 0667

See pic here, the offending yoke is circled in red,

any help appreciated!

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  #2  
Old 03-31-2011, 07:56 AM
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bluebee bluebee is offline
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EDIT: I deleted what I had written because it was off track (since I don't have the same ABS control module).

See also this ABS PDF which shows how the entire system works:
- All about BMW DSC and the score of sensors innervating this traction control system (1-pdf) (2-pdf)

Last edited by bluebee; 03-31-2011 at 02:34 PM.
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  #3  
Old 03-31-2011, 08:05 AM
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bluebee bluebee is offline
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I might end up deleting all that I said above because it doesn't seem to have wires coming out of it and the older Bosch 5.3 units have the brake pressure sensor in a different spot.

So, again, to the OP ... YOU need to look up in REALOEM what that part is (if you suspect it).

And, you need to reassure yourself that you've tested the 'normal' part of the braking system first.

Note: Someone with the older ABS might also chime in but you can just look it up yourself in realoem.
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  #4  
Old 03-31-2011, 08:20 AM
DAvEyStRiNgS DAvEyStRiNgS is offline
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Hi, thanks for all that... yes this car has the older abs unit, its a 1997 model, my 2001 530D is different from this too.

The rest of the braking system has no visible problems.... i dont think its the pressure sensor, because as u rightly state there are no wires coming from it.

I suspect it as the fault because it is leaking brake fluid, and as a result the system isnt sealed hence why im not getting any firmness on the pedal....

i had seen that post u had pasted in there, but where the pressure sensor is indicated is the wrong side of the hydraulic unit.... the rectangular item in question that i circled is on the opposite side of the ABS unit, and goes between the main brake line from the master cylinder and the abs hydraulic unit

watever it is, it shudnt be leaking fluid! its just constantly sucking air into the system

Also as i stated above, ive already searched through every possible page on realoem regarding the braking system for this car, and i cant find anythin that looks remotely like it.... unless its a built in part of the abs unit that isnt removeable :oS

Last edited by DAvEyStRiNgS; 03-31-2011 at 08:28 AM.
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  #5  
Old 03-31-2011, 02:33 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by DAvEyStRiNgS View Post
its a 1997 model, my 2001 530D is different from this too
I see you've done your homework. I guess I should delete what I wrote as it's misleading (and confusing to someone coming in anew to help you).

Let's hope someone who has the same (or similar) engine will chip in and help.
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  #6  
Old 03-31-2011, 02:46 PM
Joe@Bavarian Joe@Bavarian is offline
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I'm not sure if anyone will sale just that. Most places sale it complete. "ABS control unit"
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  #7  
Old 03-31-2011, 03:16 PM
edjack edjack is offline
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bluebee,

Do you have the description for the earlier ABS, as on my car?
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  #8  
Old 03-31-2011, 04:00 PM
cn90 cn90 is offline
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Try tighten it up and see what happens.
Use only "Flare Wrench".
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  #9  
Old 03-31-2011, 06:07 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by edjack View Post
Do you have the description for the earlier ABS, as on my car?
Doesn't that PDF also cover the earlier ABS control units?

If not, all I can tell you is we've ascertained the pinout and locations for the earlier ABS control modules ... but I really don't think your problem is ABS related.

I think you simply have a leak. Period.

I'd do what cn90 says first.
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  #10  
Old 04-01-2011, 06:23 AM
DAvEyStRiNgS DAvEyStRiNgS is offline
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ok quick update... called in with bavarian there... mechanic says its a non-return valve and is part of the older DSC/ASC unit... the newer versions (eg on my own car) have this valve built in....

anyway a new unit is 1562+VAT :-O

So i may try and take it apart see if theres any rubber seals that can be changed or failing that try ebay or a scrapper....

thanks for help anyways guys!
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  #11  
Old 04-01-2011, 06:54 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by DAvEyStRiNgS View Post
So i may try and take it apart
Good for you for doing your homework and handing it in for us to learn from.

Please do keep us informed as this thread has potential for added value.

Good luck.
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