SsangYong Actyon Sports II. Service manual - part 158

11-27

4890-10

5) Hydraulic Circuit of HBA

The above figure shows one front and one rear wheel and the same hydraulic circuit forms as in the 

ESP operation. When HECU recognizes that it is an emergency and it is required for hard braking, 

depending on the pressure value of the brake pressure sensor and pressure changes caused by the 

pressure sensor timing, it operates the pump immediately to apply the brake pressure at the wheels. 

Then, the pressure in the pump increases until just before the corresponding wheel gets locked. The 

motor still keeps rotating and the outlet valve and the separation valve will stay closed. When the wheel 

starts to lock, the HBA function cancels and switches to ABS operation.

11-28

8. CIRCUIT DIAGRAM

11-29

4890-10

Only ESP 

12-3

4610-01

1. SPECIFICATIONS

Description

Specification

Steering wheel

Type

4-spoke type

Gear box
(HPS)

Type

Rack and pinion type

Gear ratio

40.245 

Steering angle

Inner

36.2˚

Outer

32.4˚

Oil pump
(HPS)

Type

Vane type

Maximum pressure (kgf/cm2)

90 ± 3 

Pulley size (mm)

Ø115 

Operating temperature

-40℃~150℃ 

Minimum turning radius

(m) 

5.8

Steering oil

Type

S-PSF-3

Capacity (L)

Approx. 1.0

Service interval

Daily check and add if necessary.

 Steering column shaft

Tilting angle

-4.0/ 0° /+4.0° / +8.0°

This section describes the power steering pump and gear box based on the HPS (Hydraulic Power 

Steering) system. For the information of the SSPS (Speed Sensing Power Steering) system, refer to 

SSPS section under CHASSIS.