What is the matching channel number for the Passat ABS?
1 Answers
Passat ABS matching channel number 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 has a single brake pressure regulator installed in the rear wheel brake assembly line, with a wheel speed sensor mounted on the rear axle differential (some versions may 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 provides independent control for the two front wheels, while the 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 traction does not lock up), also known as hybrid control. Four-channel ABS: Equipped with four wheel speed sensors, it has a separate brake pressure regulator for each wheel's brake cylinder pipeline, enabling independent control and forming a four-channel control system. Working principle of ABS: During braking, ABS quickly determines the wheel lock-up state based on signals from each wheel speed sensor. It closes the normally open input solenoid valve for the wheel that begins to lock, maintaining the braking force. If the wheel continues to lock, the normally closed output solenoid valve opens, allowing brake pressure to rapidly decrease as the brake fluid is diverted to the reservoir, preventing complete wheel lock-up due to excessive braking force. This keeps the braking state at the optimal point (20% slip ratio S), ensuring the best braking performance and maximum driving safety.
