Autel MaxiCheck EPB - Manual (Page 5)

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The EPB is a system which controls the brake force by pulling the
parking cable as in conventional existing parking brakes. EPB
system includes a DC motor, a gearbox, a screw, a nut, a current
sensor, a Hall-effect force sensor, an acceleration sensor and an
ECU.
Generally, if a driver or a high level system operates the EPB system,
the controller calculates a target force from the parking cable based
on the car mass as well as the inclination of the road as measured by
the acceleration sensor. The EPB increases the brake force by pulling
the parking cable using the DC motor until the brake force reaches
the target force. Brake force is measured by the Hall-effect force
sensor.
2.4 TPMS system review
A tire pressure monitoring system (TPMS) is an electronic system
designed to monitor the air pressure inside the pneumatic tires on
various types of vehicles. TPMS report real-time tire-pressure
information to the driver of the vehicle, either via a gauge, a
pictogram display, or a simple low-pressure warning light. TPMS
can be divided into two different types — direct (dTPMS) and
indirect (iTPMS). TPMS are provided both at an OEM (factory)
level as well as an aftermarket solution.
When diagnosing TPMS systems, you should understand what the
TPMS tell-tale light means.
When turning the ignition OFF to ON, the TPMS tell-tale should
come on, and then go off, which indicates the system is working fine.
If the light stays on, there would be a pressure problem. If the light
flashes, there would be a system problem, which can range from
faulty sensors to sensors on the vehicle that haven‘t been learned to
that vehicle.
2.5 ABS and SRS systems
ABS -“Anti-lock Braking System” in most vehicles is made up of
an electronic hydraulic pump of two, three or most commonly four
Wheel Speed Sensors (WSS), a G-force sensor, a Vehicle Speed
Sensor and an ABS Control Module (EBCM). The EBCM is