Stefan Lohmaier
fb2c083551
Phase 2 of the English translation: Word documents (filled, EPB-specific): - 8 plans (PID, PM, QA, SWE, Test, Project Manual, CM, RM) - 6 safety docs (HARA, Safety Case, FMEDA, MISRA Compliance, Verification Report, Tool Qualification Cppcheck) - 2 manuals (User, Service) - 3 audit artefacts (Review minutes, NC-001, MISRA-REC-001) - All regenerated via pandoc from English markdown sources Code, tests, headers: - All file headers, struct comments, function docstrings in English - All test names (TEST_BEGIN strings) translated - Inline comments translated - 46 tests still green after translation CI workflows: - All step names in English - Step descriptions, comments, release notes template in English README.md fully rewritten in English with proper guided tour. Phase 3 (still pending): dev-process repo templates + toolstack/setup docs.
3.9 KiB
doc-id, version, status, date
| doc-id | version | status | date |
|---|---|---|---|
| SLM-EPB-USR-001 | 1.0 | Released | 2026-05-12 |
User Manual — Electric Parking Brake (EPB)
| Field | Value |
|---|---|
| Product | demo-epb EPB ECU |
| Version | 1.0 |
| Date | 2026-05-12 |
| Audience | Vehicle drivers |
Read the important safety information first! Familiarise yourself with the functions before using the EPB.
1. What is the Electric Parking Brake?
The Electric Parking Brake (EPB) replaces the classical handbrake. You operate it via a switch in the centre console; the system clamps the rear brakes electromechanically.
2. Operation
2.1 Engage the parking brake (apply)
- Bring the vehicle to a complete standstill.
- Keep the brake pedal pressed.
- Pull the EPB switch upwards (arrow points to the windshield).
- The red LED on the switch lights up steadily.
You will hear a soft humming sound — that is the actuator motors.
2.2 Release the parking brake
Preconditions (all must be met):
- Engine is running
- Brake pedal is pressed
- Gear selector is engaged (not in neutral)
- Push the EPB switch downwards.
- The LED goes out.
- You will hear a short humming sound again.
2.3 Auto-Hold (driver leaving the car)
When you switch the engine off and the vehicle is at a standstill, the EPB engages automatically after 2 seconds — even if you didn't operate it manually. The LED confirms.
2.4 Hill-Hold on inclines
When stopping on a slope (> 5%):
- Press the brake pedal — vehicle stops.
- Lift your foot off the brake pedal — the EPB takes over automatically.
- The LED blinks slowly while hill-hold is active.
- On drive-away (throttle + gear engaged), the EPB releases automatically.
3. LED indicator meaning
| LED status | Meaning |
|---|---|
| Off | EPB released |
| Steady red | EPB active (apply / hold) |
| Slow blink (2 Hz) | Hill-hold active or service mode |
| Fast blink (4 Hz) | Fault — visit a workshop |
4. Display in the instrument cluster
The instrument cluster shows additional text:
| Text | Meaning |
|---|---|
| "EPB active" | Parking brake engaged |
| "Hill-Hold active" | Hill-hold is taking over |
| "EPB fault" | Fault — visit a workshop |
| "EPB service mode" | In workshop mode, do not release yourself |
5. Emergency mode
If the EPB does not respond:
- Stationary and won't move: push the EPB switch downwards several times; if unsuccessful, call breakdown service.
- Stationary and the EPB does not engage: secure the vehicle with wheel chocks, contact a workshop.
6. Safety information
⚠ WARNING
- The EPB does not replace engaging a gear when parking
- On slippery surfaces additionally use wheel chocks
- While the engine is running and the EPB is engaged, do not stand on the brake pedal long-term
7. Maintenance
The EPB is maintenance-free. For brake pad replacement, the workshop must activate service mode — please do not jack up the vehicle yourself while the EPB is in the active state.
8. Revision history
| Version | Date | Change | Author |
|---|---|---|---|
| 1.0 | 2026-05-12 | First release | S. Lohmaier |