Stefan Lohmaier
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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.
106 lines
3.9 KiB
Markdown
106 lines
3.9 KiB
Markdown
---
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doc-id: SLM-EPB-USR-001
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version: 1.0
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status: Released
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date: 2026-05-12
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---
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# User Manual — Electric Parking Brake (EPB)
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| Field | Value |
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|---------------|----------------------------------------|
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| Product | demo-epb EPB ECU |
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| Version | 1.0 |
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| Date | 2026-05-12 |
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| Audience | Vehicle drivers |
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---
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> **Read the important safety information first!**
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> Familiarise yourself with the functions before using the EPB.
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## 1. What is the Electric Parking Brake?
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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.
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## 2. Operation
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### 2.1 Engage the parking brake (apply)
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1. Bring the vehicle to a complete standstill.
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2. Keep the brake pedal pressed.
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3. Pull the EPB switch **upwards** (arrow points to the windshield).
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4. The red LED on the switch lights up steadily.
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You will hear a soft humming sound — that is the actuator motors.
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### 2.2 Release the parking brake
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**Preconditions** (all must be met):
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- Engine is running
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- Brake pedal is pressed
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- Gear selector is engaged (not in neutral)
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1. Push the EPB switch **downwards**.
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2. The LED goes out.
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3. You will hear a short humming sound again.
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### 2.3 Auto-Hold (driver leaving the car)
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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.
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### 2.4 Hill-Hold on inclines
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When stopping on a slope (> 5%):
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1. Press the brake pedal — vehicle stops.
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2. Lift your foot off the brake pedal — the EPB takes over automatically.
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3. The LED blinks slowly while hill-hold is active.
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4. On drive-away (throttle + gear engaged), the EPB releases automatically.
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## 3. LED indicator meaning
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| LED status | Meaning |
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|-------------------------|---------------------------------------------------|
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| Off | EPB released |
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| Steady red | EPB active (apply / hold) |
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| Slow blink (2 Hz) | Hill-hold active or service mode |
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| Fast blink (4 Hz) | Fault — visit a workshop |
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## 4. Display in the instrument cluster
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The instrument cluster shows additional text:
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| Text | Meaning |
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|---------------------------|-------------------------------------------|
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| "EPB active" | Parking brake engaged |
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| "Hill-Hold active" | Hill-hold is taking over |
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| "EPB fault" | Fault — visit a workshop |
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| "EPB service mode" | In workshop mode, do not release yourself |
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## 5. Emergency mode
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If the EPB does not respond:
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- **Stationary and won't move:** push the EPB switch downwards several times; if unsuccessful, call breakdown service.
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- **Stationary and the EPB does not engage:** secure the vehicle with wheel chocks, contact a workshop.
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## 6. Safety information
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> **⚠ WARNING**
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>
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> - The EPB does not replace engaging a gear when parking
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> - On slippery surfaces additionally use wheel chocks
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> - While the engine is running and the EPB is engaged, do not stand on the brake pedal long-term
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## 7. Maintenance
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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.
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## 8. Revision history
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| Version | Date | Change | Author |
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|---------|-------------|---------------------|------------|
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| 1.0 | 2026-05-12 | First release | S. Lohmaier|
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