What are the three main phases of hydraulic anti-lock brake systems?

The correct answer outlines the operational phases of hydraulic anti-lock brake systems, which are crucial for maintaining vehicle stability during braking. The first phase, pressure maintain, is when the system holds hydraulic pressure to ensure effective braking without locking the wheels. The second phase, pressure decrease, occurs when the system detects a potential wheel lockup and systematically reduces hydraulic pressure to allow the wheel to keep rotating, thereby preventing skidding. Finally, pressure increase happens as the system restores hydraulic pressure back to the brakes after the wheel has regained traction, allowing the vehicle to progressively brake safely.

Understanding these phases enables technicians to troubleshoot and maintain anti-lock brake systems effectively, ensuring the technology can operate as intended under varying driving conditions.