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BRAKE ISSUE

Discuss problems you have had or are having with your Z4
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marypoppins
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BRAKE ISSUE

Post by marypoppins » Fri Sep 15, 2017 12:26 pm

Released the handbrake on the car to prior to a short trip to the garage however the handbrake light stayed on and was amber in colour.
No other warning lights, no audible alarm and the car seemed to drive ok. Could this be a sensor issue? Any advice would be appreciated.
The light stayed on for the duration of the journey and has remained like that since.
2.0i sport Sapphire black,sports seats,wheels,bluetooth prep, folding mirrors blah blah.

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ph001
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BRAKE ISSUE

Post by ph001 » Fri Sep 15, 2017 12:31 pm

You'd have to have the handbrake switch high on the list of suspicions... http://www.realoem.com/bmw/enUS/showpar ... 1316928204
Last edited by ph001 on Fri Sep 15, 2017 12:34 pm, edited 2 times in total.
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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Ducklakeview
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BRAKE ISSUE

Post by Ducklakeview » Fri Sep 15, 2017 12:32 pm

If the light changed colour, it's sensed the lever being moved. As the switch is simply an on/off, I doubt it's the culprit. Low brake fluid?

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ph001
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BRAKE ISSUE

Post by ph001 » Fri Sep 15, 2017 12:34 pm

Ducklakeview wrote: Fri Sep 15, 2017 12:32 pm If the light changed colour, it's sensed the lever being moved. As the switch is simply an on/off, I doubt it's the culprit. Low brake fluid?

Mike
Of course! I forgot it's red normally :headbang:
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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Steve84N
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BRAKE ISSUE

Post by Steve84N » Fri Sep 15, 2017 12:36 pm

Does your car have hill start assist where it holds the brakes for a couple of seconds on an incline?

If so has it stopped working?
C63 AMG Estate 6208cc

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Roundozo
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BRAKE ISSUE

Post by Roundozo » Fri Sep 15, 2017 10:13 pm

Steve84N wrote: Fri Sep 15, 2017 12:36 pm Does your car have hill start assist where it holds the brakes for a couple of seconds on an incline?

If so has it stopped working?
Hill assist isn't done via the handbrake though is it? Presumably it's done via the disks and calipers using the abs control unit.
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Steve84N
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BRAKE ISSUE

Post by Steve84N » Fri Sep 15, 2017 10:30 pm

Yes, but there is a sensor that if it fails causes a yellow handbrake light and a key symptom is the hill start assist stops working...
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marypoppins
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BRAKE ISSUE

Post by marypoppins » Mon Sep 18, 2017 12:06 pm

Its coming up with the code: 5DCA Hydraulic unit pressure sensor internal fault according to the garage??
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jamie_z4
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BRAKE ISSUE

Post by jamie_z4 » Mon Sep 18, 2017 12:30 pm

marypoppins wrote: Mon Sep 18, 2017 12:06 pm Its coming up with the code: 5DCA Hydraulic unit pressure sensor internal fault according to the garage??
sounds like the usual hydro unit failiure, 2 grand if you go to BMW or 300 quid if you send it off to ecutesting.com
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BRAKE ISSUE

Post by marypoppins » Tue Sep 19, 2017 12:28 pm

jamie_z4 wrote: Mon Sep 18, 2017 12:30 pm
marypoppins wrote: Mon Sep 18, 2017 12:06 pm Its coming up with the code: 5DCA Hydraulic unit pressure sensor internal fault according to the garage??
sounds like the usual hydro unit failiure, 2 grand if you go to BMW or 300 quid if you send it off to ecutesting.com
What!! Thats all i bloody need. These cars have more faults than a Citroen
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BRAKE ISSUE

Post by Mike6 » Tue Sep 19, 2017 5:36 pm

No expert but is the handbrake linked to the hydro unit?. I would have thought the handbrake was just a set of cables going direct to the pads and that it must be the switch that is playing up.

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BRAKE ISSUE

Post by Steve84N » Wed Sep 20, 2017 10:34 am

It's not just a handbrake light...
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BRAKE ISSUE

Post by marypoppins » Wed Sep 20, 2017 3:07 pm

Steve84N wrote: Wed Sep 20, 2017 10:34 am It's not just a handbrake light...
Is is just the handbrake light that is amber. Nothing else is showing and the car seems to drive ok?
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BRAKE ISSUE

Post by ph001 » Wed Sep 20, 2017 3:25 pm

I think he means that the yellow handbrake light can mean lots of things - not just a handbrake fault (e.g. low brake fluid, hill start assist etc). OP - if you have 5DCA Hydraulic unit pressure sensor internal fault it will almost certainly be the ABS pump however BMW now have a repair kit costing approx £185 (inc VAT) which resolves the issue. This is for the ABS pump repair module. Its a very common fault but BMW have never recalled their cars to correct the problem as it was not cost effective for them.
Last edited by ph001 on Thu Sep 21, 2017 12:04 pm, edited 1 time in total.
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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BRAKE ISSUE

Post by Steve84N » Thu Sep 21, 2017 1:03 am

Correct.

When I had just a yellow light it was the sensor cluster under the driver's seat but that code is fairly conclusive.
C63 AMG Estate 6208cc

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