Anti-Lock Brake System & Traction Control: Description

Vehicles may use Teves 04 or Teves 20 GI Anti-Lock Brake System (ABS). See Fig 1 or Fig 2 . Both systems may include Electronic Differential Lock (traction control). Traction control operates at low speeds mainly during acceleration. This helps control excess wheel spin of the front wheels.

The anti-lock brake system reduces the chance of wheel lock-up during heavy braking. The anti-lock brake system consists of 4 wheel speed sensors, Electronic Control Unit (ECU), vacuum booster, master cylinder with split diagonal brakelines, brake pedal position sensor (mounted on brake booster), hydraulic pump and solenoid valves, ANTILOCK and BRAKE warning lights.

Teves 04, uses 3 relays (located at fuse/relay panel), to protect the hydraulic modulator, traction control solenoids and ECU. The ECU is located under right rear seat. On Teves 20 GI, the ECU is mounted on bottom of hydraulic unit.

Fig 1: Identifying ABS Components (Teves 04)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: Identifying ABS Components (Teves 20 GI)

Courtesy of VOLKSWAGEN UNITED STATES, INC.