BMW electric parking brake warning
On BMWs with an electric parking brake (a button instead of a lever), a yellow parking brake warning means the system found a fault: it may not apply or release by itself. A red (P) light on its own just means the parking brake is on.
Its control unit stores the fault, and after any work on the rear brakes the system has to be put into its service mode first, or it can damage itself trying to apply.
Usual causes
- Rear brake work done without the service mode, or the system not set up again afterward.
- Low battery voltage.
- The actuator: a motor on each rear caliper on most newer BMWs, or a single motor pulling cables on some earlier ones.
- Wiring or a connector at the rear wheels.
What to do
- Read the faults in the parking brake module: they name the side or the part.
- For rear brake work, put the parking brake into its service mode first and take it out afterward: the parking brake service mode how-to shows how.
- Check the battery, then the actuator's connectors at the rear wheels.
General guidance from how BMWs work, not a diagnosis of your car: the fault the module stored, with its details, tells you more.
The fault codes behind it
- Parking brake fault codes 135 codes · E65, E66, E67, E70, E71, E72, …
How-tos
Reading the fault
AutoLingo for BMW reads the fault behind the light from the module that stored it, in plain English and with its details, and clears it after the repair, with BMW's own diagnostic protocols: a generic OBD2 code reader only reaches the engine's emissions faults. See what it does on your BMW.
Questions
- Do I need a tool to change the rear brakes on a BMW with an electric parking brake?
- Yes, or the car's own procedure where it has one: the parking brake has to be put into its service mode so the caliper motors retract, then set up again afterward.
- Can I drive with the parking brake warning on?
- If the brake released, yes, carefully, but don't rely on it to hold the car when parked: use Park (or a gear) and wheel chocks.
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