Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Anti-Lock Brake System: Description
The Teves-Mark IV-G 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.
The 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 will automatically turn off when vehicle speed is less than about 5 MPH.
A Red BRAKE warning light and Amber ABS warning light are used with the ABS. Red BRAKE warning light is located on instrument cluster, just below the tachometer. Amber ABS warning light is located on message center at center of instrument panel.
The Teves-Mark IV-G ABS may be equipped with a Low Speed Traction Control System (LTCS) which prevents front wheel slippage during fast acceleration at speeds less than 30 MPH. The ABS consists of Controller Anti-Lock Brake (CAB), Hydraulic Control Unit (HCU), brake booster and master cylinder, low brake fluid switch, ABS main relay and pump/motor relay. See Fig 1 . ABS also uses a brakelight switch, 2 proportioning valves and 4 wheel speed sensors.
On models with LTCS, a traction control switch, Amber traction control warning (TRAC OFF) light and Green traction control function (TRAC CONT) light are used.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.