Infiniti Q45. Manual - part 253

 

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Infiniti Q45. Manual - part 253

 

 

BRAKE MASTER CYLINDER

BR-13

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BRAKE MASTER CYLINDER

PFP:46010

On-Vehicle Inspection

NFS000BH

LEAK INSPECTION

Check for leaking in a master cylinder installation surface, a reservoir tank installation surface, and brake
tube connections.

Removal and Installation

NFS000BI

REMOVAL

1.

Drain brake fluid. Refer to 

BR-9, "Drain and Refill"

 .

2.

Remove harness connectors for the brake fluid level switch and pressure sensor (Models with ICC).

3.

Using a flare nut wrench, remove brake tube from master cylinder.

4.

Remove mounting nuts, and remove master cylinder assembly from vehicle.

INSTALLATION

CAUTION:

Refill with new brake fluid “DOT 3”.

Do not reuse the drained brake fluid.

1.

Temporarily tighten the flare nuts on brake tube to master cylinder by hand.

2.

Install master cylinder to brake booster assembly, and tighten the mounting nuts to the specified torque.
Refer to

BR-20, "Components"

 .

CAUTION:

Do not damage the sliding surface of the primary piston
rod and do not allow foreign materials on it's surface.

Do not reuse O-ring and primary piston.

Apply PBC (Poly Butyl Cuprysil) grease or silicon-based
grease or brake fluid for the O-ring and primary piston.

3.

Using a flare nut torque wrench, tighten the flare nut on the brake tube to the specified torque. Refer to

BR-10, "Hydraulic Circuit"

 .

4.

Refill the new brake fluid and bleed air. Refer to

BR-9, "Bleeding Brake System"

 .

SFIA2614E

BR-14

BRAKE MASTER CYLINDER

Components

NFS000HZ

Disassembly and Assembly

NFS000BJ

DISASSEMBLY
Models without ICC

1.

Clamp the flange of the cylinder body in a vice in the figure.

CAUTION:

Pay attention to the orientation of master cylinder body.

Use the copper plate or closes for clamping the body in a
vise.

1.

Reservoir cap

2.

Oil filter

3.

Reservoir tank

4.

Grommet

5.

Piston stopper

6.

Pin

7.

Cylinder body

8.

O-ring

9.

Piston stopper

10. Pressure sensor

11.

Brake fluid level switch connector

12.

O-ring

13. Secondary piston assembly

14.

Primary piston assembly

15.

Plate

16. Guide assembly

17.

Plate (With ICC model only)

18.

Snap-ring

SFIA2483E

BRA0558D

BRAKE MASTER CYLINDER

BR-15

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BR

2.

Using the pin-punch [commercial service tool: approx. 4 mm
(0.16 in) dia], remove pin from reservoir tank.

3.

Remove master cylinder assembly from a vise.

4.

Remove reservoir tank and grommet from cylinder body.

5.

Push primary piston assembly and remove piston stopper from
cylinder body.

CAUTION:

Be careful not to damage the inner wall of cylinder body. 

6.

Remove snap ring while pressing in primary piston assembly.

CAUTION:

Be careful not to put out the piston. 

7.

Holding the rod of the primary piston, remove primary piston
assembly, plate and guide with pulling straight to prevent cup
from being caught by the inner wall of the cylinder.

8.

Remove plate and guide on primary piston.

CAUTION:

Be careful not to damage the rod from the inner wall of the
plate.

9.

Tap the flange of cylinder body using a soft block such as wood,
and carefully pull the secondary piston assembly straight out to
prevent the inner wall of the cylinder from being damaged.

Models with ICC

CAUTION:

Be careful not to damage the rod of primary piston with covering cloths in acting.

BRA0559D

BRA0560D

BRA0561D

BRA0033D

BR-16

BRAKE MASTER CYLINDER

1.

Clamp the flange of cylinder body in a vise in the figure.

CAUTION:

Pay attention to the orientation of master cylinder body.

Use the copper plate or closes for clamping the body in a
vise.

2.

Push primary piston assembly and remove piston stopper from
secondary tank boss hole in cylinder body.

CAUTION:

Be careful not to damage the inner wall of the cylinder. 

3.

Remove snap ring while pressing in piston assembly.

CAUTION:

Be careful not to put out the piston. 

4.

Holding the rod of the primary piston, remove primary piston
assembly, plate and the guide assembly with pulling straight to
prevent cup from being caught by the inner wall of the cylinder.

5.

Remove plate and guide assembly on primary piston assembly.

CAUTION:

Be careful not to damage the rod by the inner wall of the
plate.

6.

Tap the flange of cylinder body using a soft block such as wood,
and carefully pull secondary piston assembly straight out to pre-
vent the inner wall of the cylinder from being damaged.

7.

Remove grommet and reservoir tank.

CAUTION:

Remove reservoir tank only when necessary.

INSPECTION AFTER DISASSEMBLY

Inspect the following items.

Cylinder Body

Check the inner wall of the cylinder for damage, wear, corrosion, and pin holes. Replace cylinder body if a
malfunction is detected.

ASSEMBLY

CAUTION:

Never use mineral oils such as kerosene or gasoline during the cleaning and assembly processes.

Make sure that there is no foreign material such as dirt and dust on the inner wall of the cylinder,
piston, and cup seal. Be careful not to damage the parts with a service tool when assembling.

BRA0558D

SFIA0997E

BRA0561D

BRA0561D

BRA0033D

 

 

 

 

 

 

 

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