---
active: true
derived: false
header: 'Actuators (calliper motors)'
level: 1.2
normative: true
reviewed: null
links:
  - SYS-001
  - SYS-002
  - SYS-003
  - SYS-007
asil: D
---

# SA-002: Actuators (calliper motors)

## Responsibility

Two electromechanical actuators on the rear callipers clamp and
release the brake pads. Supplied (assumption): commercial component
from a Tier-1 supplier.

## Interfaces

| Interface     | Type         | Notes                           |
|---------------|--------------|---------------------------------|
| Power         | 12 V, PWM    | bidirectional for apply/release |
| Current shunt | analog       | sampled inside the ECU          |

## Non-functional properties

- Max clamping force: 20 kN
- Apply time (0 → max): 600 ms
- Nominal current: 4 A
- Peak current: 30 A (brief)
- Temperature range: -40 °C to +85 °C