Toyota prius 3rd gen Brake Pedal Stroke Sensor Assembly (A30)

Toyota Prius 3 ^rd Generation (XW30)

Brake Pedal Stroke Sensor Assembly Wiring Guide: DIY Pinout Diagram

What is: A vehicle Brake Pedal Stroke Sensor Assembly is an electronic sensor that measures how far and how fast the brake pedal is pressed. It converts pedal movement into an electrical signal and sends it to systems like ABS, brake ECU and regenerative braking control. This helps optimize braking force, improve stability, support advanced safety functions and ensure accurate coordination between hydraulic and electronic braking systems.

Brake Pedal Stroke Sensor Assembly (89510-20041)

Toyota Prius 3rd-gen brake pedal stroke sensor assembly (89510-20041) close-up view

Brake pedal stroke sensor assembly mounted on Prius 3rd-gen pedal unit

OEM Toyota Prius ZVW30 brake pedal stroke sensor with connector port

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1. Introduction

      The  Toyota Prius 3rd Generation Brake Pedal Stroke Sensor Assembly (89510-20041) is a key component in the hybrid braking system, designed to precisely monitor brake pedal travel and driver braking intent. Located near the brake pedal mechanism this sensor converts pedal movement into accurate electrical signals for the brake ECU. These signals help the system blend hydraulic braking with regenerative braking, ensuring smooth stopping performance, improved energy recovery and consistent pedal feel. In addition, the sensor supports advanced safety functions such as ABS, VSC and brake assist. Its precision and reliability make it essential for maintaining overall braking efficiency and hybrid system coordination.

1. Brake System–Related Units
   • Brake Pedal Assembly:-The mechanical pedal the driver presses to begin braking.
   • Brake Booster Assembly:-Boosts braking force using hydraulic and electric pressure.
   • Brake Master Cylinder:-Creates hydraulic pressure that sends brake fluid to the wheels.
   • ABS Actuator & ECU Assembly:- Controls brake pressure to prevent wheel lock during sudden braking.
   • Skid Control ECU:-Manages ABS, VSC, TRC, and regenerative braking coordination.
   • Brake Assist System Components:- Adds extra braking force during emergency stops.
   • Brake Pressure Sensors:- Detect hydraulic pressure levels in the brake system.
   • Wheel Speed Sensors:- Measure each wheel’s rotation speed for ABS and traction control.
2. Hybrid/Regenerative Braking Units
   • HV Control ECU:-Manages hybrid system operations and decides regenerative vs. hydraulic braking balance.
   • Motor/Generator Control ECU:- Controls MG1/MG2 behavior during regeneration.
   • Regenerative Braking Control System:-Converts vehicle motion into electrical energy when braking.
   • Inverter with Converter Assembly:- Sends regenerated energy to the hybrid battery.
3. Safety & Stability Systems
   • VSC/TRC Control Module:-Maintains stability and traction during slippery or unstable driving.
   • Yaw Rate & Acceleration Sensor:- Detects vehicle rotation and body movement for stability control.
   • Brake Light Switch Assembly:-Activates brake lights and sends braking intent signals to ECUs.

2. Brake Pedal Stroke Sensor Assembly Wiring Diagram & Pinout

A. Connector Location

• Brake Pedal Stroke Sensor Assembly Position: Located on the brake pedal bracket, it measures pedal movement for braking and hybrid control systems.


• Connector Type:
  • A30 (4 pin) Black housing

B. Wiring Table

Brake Pedal Stroke Sensor Assembly (A30)

A30 TERMINALS OF Brake Pedal Stroke Sensor Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
A30-1	SKG	(W) White	➔ A58 41 (SKG) [Skid Control ECU with Acclerator Assembly]
A30-2	SKS2	(G) Green	➔ A58 40 (SKS2) [Skid Control ECU with Acclerator Assembly]
A30-3	VCSK	(B) Black	➔ A58 39(VCSK) [Skid Control ECU with Acclerator Assembly]
A30-4	SKS1	(R) Red	➔ A58 42(SKS) [Skid Control ECU with Acclerator Assembly]

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