Anti-Lock Brake System - TEVES Mark 20: Description
The Teves Mark 20 Anti-Lock Brake System (ABS) is designed to prevent wheel lock-up during heavy braking, allowing the driver to maintain steering control while stopping vehicle in shortest distance possible.
ABS uses a diagonal-split, hydraulic brake system. In standard brake mode, master cylinder primary circuit supplies pressure to right front and left rear brakes. Master cylinder secondary circuit supplies pressure to left front and right rear brakes. During an ABS stop, each brake is independently controlled by using separate hydraulic circuits for each brake. The ABS becomes enabled at speeds above 3-5 MPH and will automatically turn off when vehicle speed is less than 3-4 MPH.
ABS is equipped with a Red BRAKE warning light and an Amber ABS warning light located on instrument cluster, Controller Anti-Lock Brake (CAB), Hydraulic Control Unit (HCU), brake booster and master cylinder, low brake fluid switch, ABS system relay and pump/motor relay. The relays are internal to the CAB and are not separately replaceable. See Fig 1 . ABS also uses a brakelight switch, 2 proportioning valves and 4 wheel speed sensors. The CAB and HCU are integrated into one unit, the Integrated Control Unit (ICU). See Fig 2 .
The Teves Mark 20 ABS may be equipped with a Traction Control System (TCS) which prevents front wheel slippage during fast acceleration at speeds less than 35 MPH. Models with TCS, use a traction control switch, and Amber traction control warning (TRAC OFF) light and Green traction control function (TRAC ON) light located on instrument cluster.