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.
Antilock Braking Mode
An ABS stop occurs when the EBCM determines that one or more wheels are about to lose traction during braking. During an ABS stop the EBCM commands hydraulic pressure reduction at the wheel brake that is about to lose traction. The EBCM activates the solenoid valve for the affected wheel brake hydraulic channel. The solenoid valve triggers the adjoining flow control valve which directs hydraulic pressure into a buffer chamber. The result is a reduction in hydraulic pressure at the wheel brake thus reducing the tendency of wheel slip.
When the wheel is no longer slipping the EBCM deactivates the solenoid valve. This action allows the flow control valve to increase hydraulic pressure at the wheel brake.
This operation continues for all wheels until the wheels are no longer slipping for the duration of the stop. Although the ABS can modulate hydraulic pressure to each wheel brake it cannot increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.
The driver will notice a slight brake pedal pulsation during an ABS stop. This sensation is related to ABS component operation feedback and is considered normal.
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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.