Infiniti Q45. Manual - part 250

 

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Infiniti Q45. Manual - part 250

 

 

BR-1

BRAKE SYSTEM

F  BRAKES

CONTENTS

C

D

E

G

H

I

J

K

L

M

SECTION 

BR

A

B

BR

BRAKE SYSTEM

PRECAUTIONS .......................................................... 3

Precautions for Supplemental Restraint System 
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Brake System .................................. 3

PREPARATION ........................................................... 4

Commercial Service Tools ........................................ 4

NOISE, VIBRATION AND HARSHNESS (NVH) 
TROUBLESHOOTING ................................................ 5

NVH Troubleshooting Chart  ..................................... 5

BRAKE PEDAL  .......................................................... 6

Inspection and Adjustment ....................................... 6

PLAY AND CLEARANCE BETWEEN BRAKE 
PEDAL AND FLOOR PANEL WITH PEDAL 
DEPRESSED ........................................................ 6
ADJUSTMENT ...................................................... 7

Components ............................................................. 7
Removal and Installation  .......................................... 8

REMOVAL ............................................................. 8
INSPECTION AFTER REMOVAL  ......................... 8
INSTALLATION ..................................................... 8

BRAKE FLUID  ............................................................ 9

Checking Brake Fluid Level  ..................................... 9
Drain and Refill ......................................................... 9
Bleeding Brake System ............................................ 9

BRAKE TUBE AND HOSE ....................................... 10

Hydraulic Circuit  ..................................................... 10
Removal and Installation of Front Brake Tube and 
Hose ........................................................................11

REMOVAL ............................................................11
INSTALLATION ....................................................11

Removal and Installation of Rear Brake Tube and 
Hose ........................................................................11

REMOVAL ............................................................11
INSTALLATION ................................................... 12

Inspection after Installation  .................................... 12

BRAKE MASTER CYLINDER  .................................. 13

On-Vehicle Inspection  ............................................ 13

LEAK INSPECTION  ............................................ 13

Removal and Installation  ........................................ 13

REMOVAL ........................................................... 13
INSTALLATION ................................................... 13

Components ........................................................... 14
Disassembly and Assembly .................................... 14

DISASSEMBLY ................................................... 14
INSPECTION AFTER DISASSEMBLY ................ 16
ASSEMBLY ......................................................... 16

BRAKE BOOSTER  ................................................... 20

On-Vehicle Inspection ............................................. 20

OPERATING CHECK  .......................................... 20
AIRTIGHT CHECK  .............................................. 20

Components ........................................................... 20
Removal and Installation  ........................................ 21

REMOVAL ........................................................... 21
INSPECTION AFTER REMOVAL  ....................... 21
INSTALLATION ................................................... 21

VACUUM LINES  ....................................................... 22

Components ........................................................... 22
Removal and Installation  ........................................ 22
Inspection ............................................................... 22

VISUAL INSPECTION ......................................... 22
CHECK VALVE INSPECTION  ............................. 22

FRONT DISC BRAKE ............................................... 23

On-Vehicle Inspection ............................................. 23

PAD WEAR INSPECTION ................................... 23

Components ........................................................... 23
Removal and Installation of Brake Pad  .................. 24

REMOVAL ........................................................... 24
INSTALLATION ................................................... 25

Removal and Installation of Brake Caliper Assembly 

... 25

REMOVAL ........................................................... 25
INSTALLATION ................................................... 25

Disassembly and Assembly of Brake Caliper 
Assembly ................................................................ 26

DISASSEMBLY ................................................... 26
INSPECTION AFTER DISASSEMBLY ................ 26
ASSEMBLY ......................................................... 27
DISC ROTOR INSPECTION  ............................... 28

Brake Burnishing Procedure ................................... 28

BR-2

REAR DISC BRAKE  ................................................. 29

On-Vehicle Inspection ............................................. 29

PAD WEAR INSPECTION ................................... 29

Components ........................................................... 29
Removal and Installation of Brake Pad ................... 30

REMOVAL ........................................................... 30
INSTALLATION .................................................... 30

Removal and Installation of Brake Caliper Assembly 

... 31

REMOVAL ........................................................... 31
INSTALLATION .................................................... 31

Disassembly and Assembly of Brake Caliper 
Assembly ................................................................ 31

DISASSEMBLY ....................................................31
INSPECTION AFTER DISASSEMBLY  ................32
ASSEMBLY ..........................................................32
DISC ROTOR INSPECTION  ...............................33

Brake Burnishing Procedure  ...................................34

SERVICE DATA AND SPECIFICATIONS (SDS)  ......35

General Specifications  ............................................35
Brake Pedal  ............................................................35
Check Valve  ............................................................35
Brake Booster  .........................................................35
Front Disc Brake  .....................................................35
Rear Disc Brake ......................................................35

PRECAUTIONS

BR-3

C

D

E

G

H

I

J

K

L

M

A

B

BR

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT 
BELT PRE-TENSIONER”

NFS000B4

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for Brake System

NFS000B5

Clean dust on front brake and rear brake with a vacuum dust collector. Do not blow with compressed air.

Recommended fluid is brake fluid “DOT 3”. Refer to 

MA-10, "Fluids and Lubricants"

 .

Do not reuse drained brake fluid.

Be careful not to splash brake fluid on painted areas such as body. If brake fluid is splashed on painted
areas, wipe it off and wash it away with water immediately.

Use clean brake fluid to clean or wash all parts of master cylinder, disc brake caliper, etc.

Do not use mineral oils such as gasoline or kerosene. They will ruin rubber parts of hydraulic system.

Use a flare nut torque wrench when installing brake tube.

When installing brake piping, be sure to check torque.

Before working, turn ignition switch OFF and disconnect con-
nector for VDC/TCS/ABS control unit or battery cables.

Burnish brake pad (or lining) contact surfaces of disc rotor after
refinishing or replacing drums or rotors, after replacing pads or
linings, or if a soft pedal occurs at very low mileage.
Refer to

BR-28, "Brake Burnishing Procedure"

  (Front disc

brake), 

BR-34, "Brake Burnishing Procedure"

  (Rear disc brake).

WARNING:

Clean brake pads and shoes with a waste cloth, then wipe them with a vacuum dust collector.

SBR686C

BR-4

PREPARATION

PREPARATION

PFP:00002

Commercial Service Tools

NFS000B6

Tool name

Description

1.Flare nut crowfoot

a: 10 mm (0.39 in) / 12 mm (0.47 in)

2.Torque wrench

Installing each brake piping

Pin punch
Tip diameter: 

φ

 4 mm (0.16 in) dia.

Removing and installing reservoir tank 
pin

Power tool

Removing front and rear caliper 
assembly, tires 

S-NT360

ZZA0515D

PBIC0190E

 

 

 

 

 

 

 

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