ABS PUMP CRAZY NOISE??!

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Penelope
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ABS PUMP CRAZY NOISE??!

Post by Penelope » Tue Jun 30, 2020 7:02 pm

[vimeo]https://vimeo.com/434084888/b75f350abb[/vimeo]


The ABS/DSC 5Df0 5Df1 issue is well known and so are the solutions ie Pump Rebuild by ECU Testing.

I have just had this done and now my brakes feel very squishy and have long pedal travel. The brakes were amazing before! Normally this is to do with air in the system and I presume that is indeed what it is. The specialist who did the refit assures me that the system was bled manually and again with a computer to pump the abs module. They have asked me to see how it is in a week but if there is air in the system surely it's trapped there and is not going to purge itself?!

Please see attached video too where you can hear a rather concerning noise that certainly wasn't there before the repair work was done.

Thanks
Saul
2008 BMW Z4 3.0Si Coupe in Ceramic Coated Stratus Grey with Silver BMW MV2 Alloys & Red New England Extended Leather Upholstery with 25k miles

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ABS PUMP CRAZY NOISE??!

Post by Penelope » Tue Jun 30, 2020 7:12 pm

<iframe src="https://player.vimeo.com/video/434084888" width="640" height="360" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>
2008 BMW Z4 3.0Si Coupe in Ceramic Coated Stratus Grey with Silver BMW MV2 Alloys & Red New England Extended Leather Upholstery with 25k miles

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ABS PUMP CRAZY NOISE??!

Post by Jfgoldfish » Tue Jun 30, 2020 7:46 pm

Is that noise really coming from the abs pump!? That is a funky sound.
No the air won't purge itself. The system must be bled properly. It is not a complex procedure so it surprises me if your garage has failed to do so.
I would send the video over to ecutesting and see what they make of it.
Have you confirmed the noise is coming from the abs pump? I don't see why it would come on if it hasn't detected a locked wheel during motion.
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ABS PUMP CRAZY NOISE??!

Post by Penelope » Tue Jun 30, 2020 8:24 pm

The noise only appeared after the repair was done and only happens when you depress the brake whilst stationary. Such a pain.
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ABS PUMP CRAZY NOISE??!

Post by ph001 » Tue Jun 30, 2020 9:05 pm

How exactly did they bleed them manually? I’ve worked on z4 brakes quite a bit and never had any success bleeding by ‘pumping’ the brake pedal. Every time I have had to use a pressure bleeder on the reservoir.

The process I would suggest is:

1) Initial pressure bleed out through all four calipers, starting with the one furthest away from the master cylinder in that order, finishing with the nearest.

2) DSC purge using INPA etc

3) Repeat step 1.

I’m 99% sure that will resolve your problems
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ABS PUMP CRAZY NOISE??!

Post by Penelope » Wed Jul 01, 2020 7:14 pm

The garage just Power and Manually re bled the brakes and got a few extra bubbles out. Pedal now feels nice and firm but the noise is still there whilst stationary and pumping the brakes...not that that is a natural thing to do. If anyone can sit in there car and pump the brakes 5 or 6 times and replicate that whirring noise please let me know. The garage are chasing up with ECU Testing.
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ABS PUMP CRAZY NOISE??!

Post by Penelope » Sun Jul 05, 2020 1:26 pm

ECU Testing said the noise is normal. It doesn't do it whilst out driving about.
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ABS PUMP CRAZY NOISE??!

Post by BeeEmm » Mon Jul 06, 2020 10:13 am

I hope it is now fixed Saul and that everything else is OK with the car.
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ABS PUMP CRAZY NOISE??!

Post by ph001 » Mon Jul 06, 2020 12:15 pm

Penelope wrote:
Sun Jul 05, 2020 1:26 pm
ECU Testing said the noise is normal. It doesn't do it whilst out driving about.
I still don't think that noise is 'normal' be any means. Certainly I have never heard it!
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ABS PUMP CRAZY NOISE??!

Post by Penelope » Mon Jul 06, 2020 12:30 pm

ph001 wrote:
Mon Jul 06, 2020 12:15 pm
Penelope wrote:
Sun Jul 05, 2020 1:26 pm
ECU Testing said the noise is normal. It doesn't do it whilst out driving about.
I still don't think that noise is 'normal' be any means. Certainly I have never heard it!
They said it is the pump releasing pressure as when stationary it's not being used and pumping the brake whilst stationary is not something you would ever do naturally. The only reason I was doing it was to gauge pedal travel (which is now solid) Do you hear it if you sit there and pump the brake 5 or 6 times?
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ABS PUMP CRAZY NOISE??!

Post by ph001 » Mon Jul 06, 2020 3:58 pm

Penelope wrote:
Mon Jul 06, 2020 12:30 pm
ph001 wrote:
Mon Jul 06, 2020 12:15 pm
Penelope wrote:
Sun Jul 05, 2020 1:26 pm
ECU Testing said the noise is normal. It doesn't do it whilst out driving about.
I still don't think that noise is 'normal' be any means. Certainly I have never heard it!
They said it is the pump releasing pressure as when stationary it's not being used and pumping the brake whilst stationary is not something you would ever do naturally. The only reason I was doing it was to gauge pedal travel (which is now solid) Do you hear it if you sit there and pump the brake 5 or 6 times?
...Definitely not. The pump shouldn't even be running unless the ABS / DSC is activated so what they say makes no sense.
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

2004 E46 M3 coupe manual - gone but not forgotten.

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ABS PUMP CRAZY NOISE??!

Post by Penelope » Mon Jul 06, 2020 6:50 pm

I'll check if it does it with DTC button pressed as I understand that is suppose to disengage ABS amongst other things.

ph001 wrote:
Mon Jul 06, 2020 3:58 pm
Penelope wrote:
Mon Jul 06, 2020 12:30 pm
ph001 wrote:
Mon Jul 06, 2020 12:15 pm
I still don't think that noise is 'normal' be any means. Certainly I have never heard it!
They said it is the pump releasing pressure as when stationary it's not being used and pumping the brake whilst stationary is not something you would ever do naturally. The only reason I was doing it was to gauge pedal travel (which is now solid) Do you hear it if you sit there and pump the brake 5 or 6 times?
...Definitely not. The pump shouldn't even be running unless the ABS / DSC is activated so what they say makes no sense.
2008 BMW Z4 3.0Si Coupe in Ceramic Coated Stratus Grey with Silver BMW MV2 Alloys & Red New England Extended Leather Upholstery with 25k miles

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ABS PUMP CRAZY NOISE??!

Post by Smartbear » Mon Jul 06, 2020 8:07 pm

Penelope wrote:
Mon Jul 06, 2020 6:50 pm
I'll check if it does it with DTC button pressed as I understand that is suppose to disengage ABS amongst other things.

ph001 wrote:
Mon Jul 06, 2020 3:58 pm
Penelope wrote:
Mon Jul 06, 2020 12:30 pm
They said it is the pump releasing pressure as when stationary it's not being used and pumping the brake whilst stationary is not something you would ever do naturally. The only reason I was doing it was to gauge pedal travel (which is now solid) Do you hear it if you sit there and pump the brake 5 or 6 times?
...Definitely not. The pump shouldn't even be running unless the ABS / DSC is activated so what they say makes no sense.
I don’t think you can turn the abs off? Only the traction/stability control :?
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ABS PUMP CRAZY NOISE??!

Post by ph001 » Mon Jul 06, 2020 8:36 pm

To clarify... I mean the pump doesn’t run unless the car is actively dealing with a lock up (ABS) or applying brakes / cutting power (DSC). The pump doesn’t run during normal driving at all, irrespective of whether you have the button pressed or not.
2007 E85 Z4 3.0Si manual :driving:
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2004 E46 M3 coupe manual - gone but not forgotten.

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