BRAKE ISSUE

M

marypoppins

Active member
 Preston
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.
 
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
 
Ducklakeview said:
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
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Of course! I forgot it's red normally :headbang:
 
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?
 
Steve84N said:
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?
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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.
 
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...
 
marypoppins said:
Its coming up with the code: 5DCA Hydraulic unit pressure sensor internal fault according to the garage??
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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
 
jamie_z4 said:
marypoppins said:
Its coming up with the code: 5DCA Hydraulic unit pressure sensor internal fault according to the garage??
Click to expand...

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
Click to expand...

What!! Thats all i bloody need. These cars have more faults than a Citroen
 
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.
 
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.
 
Correct.

When I had just a yellow light it was the sensor cluster under the driver's seat but that code is fairly conclusive.
 
ph001 said:
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.
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Many thanks for that. Do i get the kit from BMW direct and does it have a part number? Sorry to be a pain!
 
Just checking the price from ECU Testing has come down significantly from £300 to £165 / £195 now so hardly worth buying the BMW kit. Worth getting a price from BBA Reman as well <links for both below>

http://www.ecutesting.com/catalogue/bmw_eculist.html?category=4047&model=658

http://www.bba-reman.com/gb/content.aspx?content=bmw_bosch_abs_pumps

The only thing that surprises me a little is you normally always get the DSC light on with this fault. Make sure you mention that fault code to them when you book the repair.
 
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