Infiniti Q45. Manual - part 255

 

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Infiniti Q45. Manual - part 255

 

 

BRAKE BOOSTER

BR-21

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Removal and Installation

NFS000BL

REMOVAL

CAUTION:

Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.

Be careful not to deform or bend brake pipes, during removal of booster.

1.

Remove vacuum hose from brake booster.

2.

Remove master cylinder. Refer to 

BR-13, "REMOVAL"

 .

3.

Disconnect solenoid harness connector from brake booster assembly (only ICC model).

4.

Remove snap pin and clevis pin on the clevis in the passenger room, and remove input rod from brake
pedal.

5.

Remove the mounting nuts on pedal bracket.

6.

Remove booster assembly from the engine room.

INSPECTION AFTER REMOVAL
Output Rod Length Inspection

1.

Using a handy vacuum pump, apply a vacuum of – 66.7 kPa (–
500 mmHg,19.69 inHg) to brake booster.

2.

Check output rod length.

INSTALLATION

1.

Loosen the lock nut to adjust input rod length so that the length
“B” (in the figure on the left) satisfies the specified value.

2.

After adjusting “B”, temporarily tighten the lock nut to install the
booster assembly to vehicle. At this time, make sure to install a
gasket between booster assembly and vehicle.

3.

Connect the brake pedal with clevis of input rod.

4.

Install the pedal bracket mounting nuts and tighten them to the
specified torque. Refer to 

BR-7, "Components"

 .

5.

Install master cylinder to booster assembly. Refer to 

BR-13,

"INSTALLATION"

 .

6.

Connect solenoid harness connector to brake booster assembly (only ICC model).

7.

Adjust the height and play of brake pedal. Refer to 

BR-6, "Inspection and Adjustment"

 .

8.

Tighten the lock nut of input rod to the specified torque. Refer to 

BR-20, "Components"

 .

9.

Bleed air. Refer to 

BR-9, "Bleeding Brake System"

 .

Standard dimension when vacuum
 

66.7 kPa (

500 mmHg, 

19.69 inHg)

Without ICC:

6.2 mm (

0.24 in)

With ICC:

: 10.4 mm (0.409 in)

SBR208E

Length “B”

: 125 mm (4.92 in)

SGIA0060E

BR-22

VACUUM LINES

VACUUM LINES

PFP:41920

Components

NFS000BM

Removal and Installation

NFS000BN

CAUTION:

Because vacuum hose contains a check valve, it must be
installed in the correct direction. Refer to the stamp or label
to confirm correct installation. The brake booster will not
operate normally if hose is installed in the wrong direction.

Position clip with clip position stamp when installing clip to
vacuum hose.

Insert vacuum hose for at least 24 mm (0.94 in).

Do not use lubricating oil during assembly.

Inspection

NFS000BO

VISUAL INSPECTION

Check for improper assembly, damage and deterioration.

CHECK VALVE INSPECTION
Airtightness Inspection

Use a handy vacuum pump to check.

1.

For intake manifold

2.

Clamp

3.

Vacuum hose (Build-in check valve)

4.

Clip position stamp

5.

Clip

6.

Engine side indicator stamp

7.

For brake booster

SFIA2646E

SBR225B

When connected to booster side (1):

 Vacuum decrease should be within 1.3 kPa (10 
mmHg, 0.39 inHg) for 15 seconds under a vacuum 
of 

66.7 kPa (

500 mmHg, 

19.69 inHg)

When connected to engine side (2):

 No vacuum will be applied

SFIA0210E

FRONT DISC BRAKE

BR-23

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FRONT DISC BRAKE

PFP:41000

On-Vehicle Inspection

NFS000BP

PAD WEAR INSPECTION

Check pad thickness from check hole on cylinder body.

Components

NFS000BQ

WARNING:

Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of airborne
particles or other materials. Do not blow with compressed air.

CAUTION:

While removing cylinder body, do not depress brake pedal because piston will pop out.

Standard thickness 

: 10.0 mm (0.394 in)

Repair limit thickness

: 2.0 mm (0.079 in)

MAA0439D

1.

Union bolt

2.

Copper washer

3.

Cap

4.

Bleed valve

5.

Sliding pin bolt

6.

Cylinder body

7.

Piston seal

8.

Piston

9.

Piston boot

10. Inner shim

11.

Inner pad

12. Pad retainer

13. Outer pad

14. Outer shim

15. Outer shim cover

16. Torque member mounting bolt

17. Sliding pin

18. Washer

19. Bushing

20. Torque member

21. Sliding pin boot

A:

After tightening the bolts to the specified torque, tighten the bolts additionally by turning the bolts 32 to 37 degrees.

Refer to 

GI-9, "Components"

 and the followings for the symbols in the figure.

1: Apply rubber grease.

2: Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease.

3: Apply polyglycol ether based lubricant.

: Apply brake fluid.

PFIA0693E

BR-24

FRONT DISC BRAKE

It is not necessary to remove torque member mounting bolts on torque member and brake hose
except for disassembly or replacement of caliper assembly. In this case, hang cylinder body with a
wire so that brake hose is not under tension.

Do not damage piston boot.

Always replace shim and shim covers as a set when replacing brake pads.

Keep rotor clean off brake fluid.

Removal and Installation of Brake Pad

NFS000BR

REMOVAL 

WARNING:

Clean brake pads with a vacuum dust controller to minimize a hazard of airborne particles or other
materials.

CAUTION:

When cylinder body is opened, do not depress brake pedal because piston will pop out. 

Be careful not to damage piston boot or get oil on disc rotor. Always replace shims in replacing
pads.

If shims are rusted or show peeling of rubber coat, replace them with new shims.

It is not necessary to remove torque member mounting bolt except for disassembly or replace-
ment of caliper assembly. In this case, suspend cylinder body with wire so as not to stretch brake
hose.

Carefully monitor brake fluid level because brake fluid will return to reservoir when pushing back
piston.

Burnish brake contact surfaces 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 Proce-

dure"

 .

1.

Remove tires from vehicle with a power tool.

2.

Remove lower sliding pin bolt.

3.

Hang cylinder body with a wire, and remove pads, pad retainers,
shims from torque member.

CAUTION:

Do not damage piston boot.

Keep rotor clean, off brake fluid.

When removing pad retainer from torque member, lift pad
retainer in the direction shown by arrow (shown in the
figure) so as not to deform it.

Do not damage piston boot.

Keep rotor clean, off brake fluid.

SBR433D

SBR556E

 

 

 

 

 

 

 

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