Geely EC718, EC718RV, EC715, EC715RV. Manual part — 299

6.4 Hydraulic Brake

6.4.1 Specifications
6.4.1.1 Fastener Tightening Specifications

Applications

Model

Specifications

Metric (Nm)

US English (lb-ft)

Brake Master Cylinder
Retaining Nut

M8

20-30

14.8-22.2

Brake Master Cylinder Tube
Connecting Nut

M10

11-21

8.1-15.5

Brake Hose Connecting Nut

M10

11-21

8.1-15.5

Vacuum Booster U-shape Clip
Locking Nut

M10

15-25

11.1-18.5

Vacuum Booster Retaining Nut

M8

20-25

14.8-18.5

Clutch / Brake Pedal Assembly
Lower Retaining Bolt

M8 × 16

20-25

14.8-18.5

Clutch / Brake Pedal Assembly
Upper Retaining Bolt

M8 × 15

20-25

14.8-18.5

Clutch / Brake Pedal Assembly
Retaining Nut

M8

16-26

11.8-19.2

Pedal Installation Screw

M10 × 130

30-40

22.2-29.6

Pedal Installation Nut

M10

30-40

22.2-29.6

Brake System

Hydraulic Brake

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6.4.2 Description and Operation
6.4.2.1 Description and Operation

Hydraulic braking system includes the following
components:

Brake Pedal:Receives, amplifies and transmits braking system
input from the driver.

Brake Pedal Putter:Transmits amplified brake pedal input force
into the vacuum booster.

Vacuum Booster:Braking system input force is amplified
through the brake pedal and passed to the vacuum booster,
boosted by the vacuum brake booster and then transmitted to
the master cylinder. Vacuum booster boosts the braking force
by vacuum to help reduce the driver braking effort.

Vacuum Hose:Used for transmission of the vacuum booster
required vacuum source.

Brake Master Cylinder Tank:Filled with the hydraulic brake fluid
used by the system.

Brake Master Cylinder:Converts the mechanical input to
hydraulic output pressure. Hydraulic pressure from the master
cylinder output assigned to the two hydraulic fluid channels,
providing braking fluid pressure to diagonal wheels.

Hard brake pipe and brake hose:Pass brake fluid flow to
hydraulic brake system components.

Brake Wheel Cylinder:Converts the hydraulic input pressure to
mechanical output force.

System Operation

The mechanical force from the brake pedal is converted to fluid
pressure by the master cylinder, through the hydraulic
electronic control unit (ie HECU) , and through the brake pipes
and hoses transferred to the braking cylinder. Brake Cylinder
then converts the hydraulic pressure to the mechanical force.
So the brake pad presses the brake disc to achieve the vehicle
braking.

Brake Fluid Level Low Warning Lamp

Instrument cluster detects the low brake fluid level (signal
circuit low voltage), and lights up the brake fluid level low
warning lamp.

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Hydraulic Brake

Brake System

6.4.3 Component Locator
6.4.3.1 Component Locator

3

1

2

FE06-1004b

Legend

1. Brake Master Cylinder Tank
2. Vacuum Booster

3. Brake Master Cylinder

Brake System

Hydraulic Brake

6-31

6.4.4 Diagnostic Information and Procedures
6.4.4.1 Diagnostic Notes

1. Be careful when replacing various components, it may affect the brake system performance and lead to driving danger. Use

Geely genuine parts.

2. When servicing the brake system, keeping venues and parts clean is very important.

3. If brake fluid leakage is found, must disassemble components. If any unusual circumstance is found, replace with new

components.

4. When removing brake components, wrap brake pipe joints to prevent dust, dirt and other impurities entering into the pipe.

5. When removing or installing brake pipes, do not damage or deform the brake pipes.

6. When installing brake pipes or brake hose, make sure do not distort or bend.

7. Brake hose must be away from the shock absorber oil, grease and so on.

8. After installing brake hardware, the pipes and brake hoses should not interfere with other components.

9. Do not let brake fluid adhere to the surface of the body such as painting. If the brake fluid leaks to the paint surface, promptly

remove it.

6.4.4.2 Fault Symptom Table

Symptoms

Suspected Parts

Measures / Refer to

Brake Warning Lamp Always On

1. Brake Surface

Refer to

6.4.4.3

Brake Warning Lamp

Always On

2. Brake Fluid Level Sensor

Refer to

6.4.4.3

Brake Warning Lamp

Always On

3. Brake Fluid Level Sensor Wiring
Harness

Refer to

6.4.4.3

Brake Warning Lamp

Always On

Brake System Noise

1. Brake Pads (Broken, Twisted, Dirty,
Smooth)

Refer to the front and rear brake
Diagnostic Information and Procedures in
the

6.2.4.1

Brake Pad Inspection

2. Brake caliper bracket bolts (Loose)

Check the brake caliper bracket bolts

3. Brake caliper bolts (Loose)

Check the brake caliper bolts

4. Brake disc (Front)

Refer to

6.2.4.5

Brake Disc Surface and

Worn Inspection

5. Brake Disc Guide (Loose)

Refer to the front and rear brake
Diagnostic Information and Procedures in
the

6.2.4.3

Brake Guide Inspection

6. Brake Caliper Floating Pin (Worn)

Refer to the front and rear brake
Diagnostic Information and Procedures in
the

6.2.4.4

Floating Brake Caliper Pin

Inspection

Brake Deviation

1. Piston (Fixed, and Block)

Refer to the front and rear brake
Diagnostic Information and Procedures in
the

6.2.4.2

Brake Caliper Inspection

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Hydraulic Brake

Brake System