Lifan 620. Instruction - page 40

2. ABS operation (pressure decrease) condition (Table 3-2 and Fig. 3-4).

Table 3-2

Solenoid valve

Electricity

Solenoid valve condition

Normally opened valve

On

Closed

Normally closed valve

On

Open

Fig. 3-5

The pressure of wheel slave cylinder is maintained by the closed normally opened valve and

normally closed valve, when proper pressure is applied to the salve cylinder through increase or

decrease of pressure.

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4. ABS operation (pressure increase) condition (Table 3-4 and Fig. 3-6).

Table 3-4

Solenoid valve

Electricity

Solenoid valve condition

Normally opened valve

Off

Open

Normally closed valve

Off

Closed

Fig. 3-7

EBD is to guarantee the operation stability. Rear wheel will be stopped after front wheel. As front

brake does more work than rear brake, the rear wheel will stop first if it receives equal pressure. In

order to prevent it, the equipment, pressure reducing valve (P-Valve), to decrease the pressure of

rear wheel is needed. A special P-Valve is not necessary for the vehicle with ABS, as ABS can

control the rear wheel braking pressure with supplementary procedures and improve the operation

stability.

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Section III Removal and Installation of ABS

I. Spare Parts Supply Condition

1. Difference between dry HECU and wet HECU (Fig. 3-8)

RL).

Fig. 3-9

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2. Notes on HECU bracket assembly

(1) As installation error may occur for the frictional resistance of buffer pad when tightening (3)

bolts, lubricant not affecting physical property of buffer pad is preferred.

(2) For easy operation, (3) bolts can be inserted into the buffer pad on bracket and then to HECU.

(3) Make sure the tightening torque of (3) bolts is 20N·m with a special tool, torque wrench, as

shown in Fig. 3-10.

(5) Clean the surface with cleanser without mineral oil before removal.

(6) Do not use compressed air or move the vehicle when system is opened.

(7) Block the hydraulic pressure outlets with plugs as soon as possible after removal of ABS

assembly.

(8) Remove other parts hindering operation.

(9) Use DOT#4 brake fluid.

(10) Soak the seal component with brake fluid, not with engine oil or brake unguent.

(11) Check for leakage of connectors of all hydraulic pipes.

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