Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Parking Brake Button: Notes
The parking brake button supplies the EMF control unit with the button operation signal. The signal is duplicated on the parking brake button and transmitted to the EMF control unit via double direct wired connections. It not only enables the EMF control unit to distinguish between the resting position and the two directions of operation (release/apply). Faults can also be detected (e. g. broken circuit, short circuit). If such a fault is detected, the function of the parking brake can still be maintained in most cases.
In contrast with the button on the E70/E71, the parking brake button on the F01/F02 has a function indicator lamp. It is an LED that tells the driver when the parking brake is on. The EMF control unit directly controls that LED.
It is important to note that the button directly behind it for the Automatic Hold function is not wired to the EMF control unit but to the DSC control unit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.