Chery A1 2009 Service Manual page 616

Description
The Antilock Brake System (ABS) uses components of the base brake system, but also features the following com-
ponents:
• Hydraulic Control Unit (HCU) and Antilock Brake System (ABS) Module
• Wheel Speed Sensors - Four sensors (one sensor at each wheel making it a four-channel system)
The purpose of the ABS is to prevent wheel lockup under braking conditions on virtually any type of road surface.
Antilock braking is desirable because a vehicle that is stopped without locking the wheels retains directional stability
and some steering capability. This allows the driver to retain greater control of the vehicle during braking.
Operation
ABS Braking
• ABS operation is activated when the ABS hydraulic control module senses a wheel lock-up condition. If a wheel
lock-up is detected during a brake application, the brake system enters the ABS mode. During ABS braking,
hydraulic pressure in the four wheel circuits is modulated to prevent any wheel from locking. Each wheel circuit
is designed with a set of electric solenoids to allow modulation. The system can build and release pressure at
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GENERAL INFORMATION
Chery Automobile Co., Ltd.
PZSM120019