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Brake DSC Module Replacing
 
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Pelican Technical Article:

Brake DSC Module Replacing

Nick Czerula

Time:

3 hours3 hrs

Tab:

$2580

Talent:

***

Tools:

T20 Torx bit, flat head screwdriver, Digital Meter

Applicable Models:

BMW Z4 Convertible (2003-08)
BMW Z4 Coupe (2006-08)

Parts Required:

Brake DSC Module, fasteners

Hot Tip:

Make sure the Torx bit is fully seated in the fastener so you don't strip it.

Performance Gain:

Replace failed module keeping the ABS/DSC warning light on.

Complementary Modification:

Replace the brake fluid

If you have an ABS / DSC warning light on in your instrument cluster you have problem with the ABS / DSC system and you do not have anti-lock brake function or traction control. This can lead to unsafe driving situations. If you have the codes pulled in the braking system and you get a code for the brake pressure switch voltage being low it may not be the pressure switch that is the problem. Sometimes the module fails to put out the 5 volt reference and therefor the signal voltage drops out. The ABS/ASC module sees this as a failure of the switch and not the module 5 volt reference. You can send the module out to companies like Module Masters and they can sometimes repair your unit. If your unit goes back in the car there is no need to code the unit. If you purchase a new one and install it you will have to take it to an automotive repair shop that has the equipment to program modules. You may also have pump or solenoid faults, all of which are usually the module.

  • 5E19 DSC: Engine management: interface
  • 5DF0 DSC: Hydraulic unit: pump motor
  • 5DF1 DSC: Hydraulic unit: pump motor connector faulty

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please include your vehicle information.

The DSC module (red arrows) is located under the coolant reservoir and brake master cylinder on the left side of the engine compartment.
Figure 1

The DSC module (red arrows) is located under the coolant reservoir and brake master cylinder on the left side of the engine compartment. Make sure the ignition key is off. Disconnect the battery negative terminal and cover it so it doesn't accidentally reconnect. Remove the intake air ducts and the coolant reservoir. If only replacing the electrical portion of the module (electrical repair are kits available), remove the wheel well liner of the left side as well. See our tech articles for the corresponding procedures.

Working at the module, pull the slide lock (red arrow) up (blue arrow).
Figure 2

Working at the module, pull the slide lock (red arrow) up (blue arrow). Once you have moved the slide lock all the way to the end pull the electrical connector straight off the module.

To replace the hydraulic unit and electrical unit as a unit, begin by removing the six 11mm hydraulic lines (red arrows).
Figure 3

To replace the hydraulic unit and electrical unit as a unit, begin by removing the six 11mm hydraulic lines (red arrows). Be prepared to catch any leaking brake fluid. If you have a pedal depressing tool, press the brake pedal about half way down. This will prevent large amount of fluid from leaking out. If only replacing the electronic part of the DSC unit, skip this step.

Remove the 10mm DSC mounting fastener (red arrow), located at the strut tower (blue arrow).
Figure 4

Remove the 10mm DSC mounting fastener (red arrow), located at the strut tower (blue arrow). If replacing the entire unit, lift the unit up and detach the two lower grommets. Move the brake lines aside as you remove the unit, catching any dripping brake fluid. Reverse steps to install new unit, have module coded using a BMW scan tool. If replacing only the electronic portion, continue with the next steps.

Gently lever the module toward the grommets (blue arrow), this will tilt it down slightly and make room for the Torx driver to fit (red arrows).
Figure 5

Gently lever the module toward the grommets (blue arrow), this will tilt it down slightly and make room for the Torx driver to fit (red arrows). Once tilted down, remove the rear top T20 Torx fastener. If you don't tilt the module slightly, the E-box will not allow the Torx driver to fit. Make sure the Torx bit is fully seated in the fastener head. You don't want to strip any of these screws as they are difficult to get to.

Remove the remaining three T20 Torx module fasteners (red arrows).
Figure 6

Remove the remaining three T20 Torx module fasteners (red arrows). Make sure the Torx driver bit (blue arrow) is fully seated in the fastener head. You don't want to strip any of these screws as they are difficult to get to.

Pull the module away from the hydraulic unit to remove.
Figure 7

Pull the module away from the hydraulic unit to remove. Do not leave the hydraulic unit solenoid area exposed to the elements. If you are sending the module out to be repaired or remanufactured cover the hydraulic unit with a plastic bag to reduce the exposure to moisture that will allow metal parts to start corroding. It you have desiccant bags, throw them in there to absorb any moisture.

You can use a recycled module if it is available.
Figure 8

You can use a recycled module if it is available. Most times you will be returning the first one sent to you, as they are usually faulty. It may take a few tries with used ones to find a good one. If you decide to do this, be sure the part number (red arrow) matches. Reverse steps to install new module. Program new module using a BMW scan tool when complete.

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Page last updated: Mon 12/5/2016 03:04:13 AM