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 (ABS) and Stability Control - Overview: Overview
The ABS and stability control systems are comprised of the following subsystems which assist the driver in maintaining control of the vehicle:
- ABS
- EBD
- ESC
- Hill start assist
- RSC
- Side-wind stabilization
- Traction control
- Trailer sway control
The ABS helps maintain steering control during hard braking by preventing the wheels from locking up. The ABS also includes a brake assist function which provides maximum brake system pressure during a severe braking situation.
The EBD system helps maintain vehicle control by keeping a balanced braking condition between the front and rear wheels.
The ESC system helps prevent skids or lateral slides by modulating brake fluid pressure to individual brake calipers and reducing engine torque.
The hill start assist system is designed to assist the driver during hill-starts. Using the ABS, the hill start assist system holds the vehicle on an incline for a short time, allowing the driver to release the brake pedal and press the accelerator pedal without needing to use the parking brake.
The RSC system helps prevent excessive vehicle roll by modulating brake fluid pressure to individual brake calipers and reducing engine torque.
The side-wind stabilization system helps to reduce the effect of a sudden side-wind gust on the vehicle.
The traction control system helps prevent loss of traction by reducing drive-wheel spin during acceleration.
The trailer sway control system helps maintain vehicle stability while towing a trailer by detecting and aiding in the reduction of conditions causing trailer sway.
Some noise from the system and pulsations in the brake pedal are considered normal conditions during most ABS and stability control system activations. Longer than normal brake pedal travel may also be experienced immediately following an ABS or stability control system activation.
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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.