Hi All,
I thought I would share the DSC Hydro unit DIY that I done this morning.
As many of you know if your DSC unit fails you get some nasty errors on the dash and you may think this is very expensive!
However you can get a "rebuild" kit direct from BMW for £168 Inc VAT.
This takes about 2-3 hours.
Before you carry this out you will need to get hold of BMW's diagnostic software INPA or DIS as you need to bleed the system using activation of the DSC Pump.
You will also need a pressure bleeder, you can pick these up from halfords for about £20
1. Open the bonnet, boot and front doors.
2. Disconnect the negative battery terminal in the boot.
3. Jack up the passenger side of the vehicle and remove both front and rear passenger side wheels.
4. You will need to depress the brake pedal about half way for the removal and refit of the DSC unit, if you have something telescopic perfect if not a suitable size bit of 2x2 would work just as well forced against the drivers seat.
5. Release the pressure created from pressing the brake pedal by opening the bleed screws on the passenger side brake calipers. 9mm spanner should do it. (remember to use a brake bleeding bottle to catch fluid)
6. Remove the pollen filter, scuttle, and plastic covers from around the DSC area, very easy 8 x 8mm bolts.
7. Label the brake lines on the DSC unit so that you make sure they go back in the same place
8. Remove the brake lines from the DSC unit, be ready to catch a very small amount of brake fluid MAKE SURE NONE GETS ON YOUR PAINTWORK AS ITS CORROSIVE!!!! the kit is supplied with plasic plugs to plug the holes in the old DSC unit.
9. Remove the main wiring harness connector by pulling up on the grey locking mechanism to remove, cover with tape to protect the pins.
10. Remove the DSC unit from the vehicle, this will take a bit of fiddling
11. Separate the DSC pump from the ECU part of the DSC module by undoing 2 torx bolts on the body of the DSC pump, 1 long 1 short. (BE VERY CARFULL HERE, THERE ARE VERY SMALL PINS WHICH YOU DO NOT WANT TO DAMAGE, TAKE IT APART STRAIGHT AND SMOOTH)
12. slide on the new DSC pump and do up the 2 torx bolts, you should get new ones in the kit.
13. Install back on the car in reverse order of what you have just done, taking care that everything is done up correctly.
14. Once you are happy everything is connected correctly, connect the battery. at this point you will find that your error has probably gone of the dashboard as ours did.
15. attach the pressure bleeder and bleed the brakes using the procedure outlined in BMW INPA. (bleeding procedure is under Chassis/DSC) (DO NOT DRIVE THE CAR UNTIL THIS HAS BEEN DONE YOU WILL HAVE AIR IN THE SYSTEM)
16. Clear any fault codes using INPA
17. Once you are happy and the brake pedal is nice and firm take for a careful test drive to make sure everything is working as it should.
18. Enjoy!
I thought I would share the DSC Hydro unit DIY that I done this morning.
As many of you know if your DSC unit fails you get some nasty errors on the dash and you may think this is very expensive!
However you can get a "rebuild" kit direct from BMW for £168 Inc VAT.
This takes about 2-3 hours.
Before you carry this out you will need to get hold of BMW's diagnostic software INPA or DIS as you need to bleed the system using activation of the DSC Pump.
You will also need a pressure bleeder, you can pick these up from halfords for about £20
1. Open the bonnet, boot and front doors.
2. Disconnect the negative battery terminal in the boot.
3. Jack up the passenger side of the vehicle and remove both front and rear passenger side wheels.
4. You will need to depress the brake pedal about half way for the removal and refit of the DSC unit, if you have something telescopic perfect if not a suitable size bit of 2x2 would work just as well forced against the drivers seat.
5. Release the pressure created from pressing the brake pedal by opening the bleed screws on the passenger side brake calipers. 9mm spanner should do it. (remember to use a brake bleeding bottle to catch fluid)
6. Remove the pollen filter, scuttle, and plastic covers from around the DSC area, very easy 8 x 8mm bolts.
7. Label the brake lines on the DSC unit so that you make sure they go back in the same place
8. Remove the brake lines from the DSC unit, be ready to catch a very small amount of brake fluid MAKE SURE NONE GETS ON YOUR PAINTWORK AS ITS CORROSIVE!!!! the kit is supplied with plasic plugs to plug the holes in the old DSC unit.
9. Remove the main wiring harness connector by pulling up on the grey locking mechanism to remove, cover with tape to protect the pins.
10. Remove the DSC unit from the vehicle, this will take a bit of fiddling
11. Separate the DSC pump from the ECU part of the DSC module by undoing 2 torx bolts on the body of the DSC pump, 1 long 1 short. (BE VERY CARFULL HERE, THERE ARE VERY SMALL PINS WHICH YOU DO NOT WANT TO DAMAGE, TAKE IT APART STRAIGHT AND SMOOTH)
12. slide on the new DSC pump and do up the 2 torx bolts, you should get new ones in the kit.
13. Install back on the car in reverse order of what you have just done, taking care that everything is done up correctly.
14. Once you are happy everything is connected correctly, connect the battery. at this point you will find that your error has probably gone of the dashboard as ours did.
15. attach the pressure bleeder and bleed the brakes using the procedure outlined in BMW INPA. (bleeding procedure is under Chassis/DSC) (DO NOT DRIVE THE CAR UNTIL THIS HAS BEEN DONE YOU WILL HAVE AIR IN THE SYSTEM)
16. Clear any fault codes using INPA
17. Once you are happy and the brake pedal is nice and firm take for a careful test drive to make sure everything is working as it should.
18. Enjoy!