1. Key Technical Specifications Measuring medium: DOT3 / DOT4 brake fluid; compressed air for commercial vehicle air brakes Measuring range: 0–10MPa for passenger car hydraulic brakes; 0–10bar for truck air brakes Operating temperature: -40℃ ~ +140℃ with full-range temperature compensation Measurement accuracy: ±0.5%FS ~ ±1.5%FS Response time: ≤10ms fast pressure feedback Ingress protection: IP67 dustproof and waterproof Supply voltage: Standard 5VDC automotive power supply Vibration resistance: 10–20g anti-vibration performance Service lifespan: Over 3 million full pressure cycle tests 2. Core Function Capture brake fluid pressure instantly when stepping on brake pedal and feed accurate pressure data to vehicle ECU. Support ABS anti-lock system to adjust independent wheel braking force, avoid wheel lock and shorten braking distance. Provide pressure data for ESP stability control, new energy vehicle regenerative braking and brake booster assist. Built-in self-diagnosis detects pipeline leakage, abnormal pressure, open or short circuits, activates dashboard warning light and stores DTC codes. Monitor dual-circuit brake pressure to identify single-circuit failure and eliminate braking risks. 3. Working Principle Most models adopt piezoresistive sensing technology: Brake hydraulic pressure deforms the stainless steel or silicon sensitive diaphragm slightly. Embedded strain resistors generate resistance changes proportional to applied pressure. Wheatstone bridge converts resistance variation into standard 0–5V analog voltage signals. Internal signal conditioning and ADC chips filter interference and output stable analog or I2C digital signals to ECU. Air brake sensors for commercial vehicles use capacitive principle: diaphragm movement changes electrode clearance to generate pressure signals. 4. Application Scope Passenger Vehicles Gasoline cars, hybrid EVs and BEVs equipped with ABS, ESP and AEB automatic emergency braking systems. Commercial Vehicles Light trucks, heavy trucks, coaches and construction machinery with EBS electronic brake systems. Application Scenarios Daily passenger transport, NEV regenerative braking matching, intelligent driving safety auxiliary systems.