Braking System

A braking system (Brake System) is a combined electro-mechanical control assembly in a motor vehicle designed to decelerate, bring the vehicle to a complete stop, or keep it stationary when parked. Serving as a crucial safety assembly, a modern automotive braking system generally comprises four primary components: the energy supply unit, control mechanism, transmission system, and brake actuators. When the driver presses the brake pedal, the system converts mechanical force into hydraulic pressure or electrical signals, which then uses friction pairs (brake pads and brake discs/drums) to convert the vehicle's kinetic energy into thermal energy, dissipating it into the air to effectively control vehicle speed.

Core Technical Architectures and Operating Principles

Depending on power sources and control logic, modern automotive braking systems are primarily categorised into the following technical setups:

Hydraulic Service Braking and Vacuum Boost Architecture (Hydraulic Service Braking and Vacuum Boost):

Conventional internal combustion engine (ICE) vehicles typically adopt a hydraulic braking system. When the driver steps on the pedal, the vacuum brake booster (utilising vacuum from the engine intake manifold or an electric vacuum pump) amplifies the foot force, pushing the piston inside the brake master cylinder (brake pump). The master cylinder pressurises the brake fluid, which is rapidly channelled via high-pressure brake hoses to the wheel calipers at all four wheels, forcing the caliper pistons to clamp the brake pads against the brake discs to generate friction braking. 

By-Wire Hydraulic and Electromechanical Braking Architecture (By-Wire Hydraulic and Electromechanical Braking):

Modern new energy vehicles (NEVs) and smart vehicles widely adopt brake-by-wire systems (such as EHB and EMB). This setup physically or logically decouples the brake pedal from the actual braking actuators: pedal travel sensors translate the driver's braking input into electrical signals transmitted to the Brake Control Unit (BCU), which commands electric motors or high-pressure solenoid valves to precisely regulate brake pressure. This not only allows seamless blending with regenerative braking (Regenerative Braking) systems, but also significantly enhances the response speed and braking redundancy of active safety systems. 

Safety Guidelines and Physical Limitations

Never continue driving at high speeds if the braking system develops severe faults—such as a spongy brake pedal, serious brake fluid leaks, a red brake warning light on the meter cluster, or significantly increased stopping distances (Prohibiting High-Speed Driving with System Failures):

The braking system is the vehicle's ultimate mechanical safety defence. Driving with existing faults is strictly forbidden; if hydraulic pressure drops due to fluid leaks or if the master pump fails, the vehicle will completely lose its stopping power in emergencies. In such scenarios, bring the vehicle to a safe halt by downshifting (engine braking) and progressively engaging the handbrake or electronic parking brake (EPB) switch to pull over safely.

Never neglect periodic brake maintenance or arbitrarily extend the service intervals for brake pads, brake discs (rotors), and brake fluid (Prohibiting Neglecting Regular Maintenance and Component Wear Limits):

All friction components and hydraulic media have strict physical service lives and operating thresholds. Overusing worn components is strictly prohibited. If brake pads wear past their minimum allowable thickness, brake discs crack, or moisture-contaminated brake fluid causes boiling points to plummet, severe brake fade or total brake failure can occur during sustained downhill descents or hard emergency braking. Always adhere strictly to the vehicle's periodic service schedule for inspection and replacement.