What is the matching channel number for the Passat's ABS?
1 Answers
The matching channel number for the Passat's ABS is 42. Classification of ABS: ABS control channels are divided into four-channel, three-channel, two-channel, and single-channel types. Single-channel ABS: Also known as one-channel ABS, it features a single brake pressure regulator in the rear wheel brake line and a wheel speed sensor installed on the rear axle differential (some models have one sensor on each rear wheel). Two-channel ABS: This type of ABS struggles to balance directional stability, steering control, and braking efficiency, and is rarely used today. Three-channel ABS: It independently controls the two front wheels, while the two rear wheels are controlled together based on the low-select principle (i.e., both wheels are controlled by one channel to ensure the wheel with less adhesion does not lock), also known as hybrid control. Four-channel ABS: Equipped with four wheel speed sensors, it has a brake pressure regulator in the line to each wheel's brake cylinder for independent control, forming a four-channel control system. Working principle of ABS: During braking, ABS quickly determines if a wheel is locking based on signals from each wheel speed sensor. It closes the normally open input solenoid valve for the locking wheel to maintain braking force. If the wheel continues to lock, the normally closed output solenoid valve opens, allowing brake fluid to flow directly to the reservoir, rapidly reducing pressure on that wheel and preventing complete lockup. This keeps the braking state at the optimal point (20% slip rate S), ensuring the best braking performance and maximum driving safety.
