Infiniti FX35, FX50 (S51). Manual - part 233

BRAKE MASTER CYLINDER

BR-29

< REMOVAL AND INSTALLATION >

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BRAKE MASTER CYLINDER

Exploded View

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WITHOUT ICC

WITH ICC

1.

Reservoir cap

2.

Oil strainer

3.

Reservoir tank

4.

Brake fluid level switch connector

5.

Cylinder body

6.

Pin

7.

O-ring

8.

Grommet

: Apply silicone grease.

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

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BR-30

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

Removal and Installation

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REMOVAL 

CAUTION:

Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it
off immediately and wash with water if it gets on a painted surface.

1.

Remove the master cylinder cover.

2.

Remove hoodledge cover. Refer to 

EXT-22, "Exploded View"

.

3.

Drain brake fluid. Refer to 

BR-10, "Draining"

.

4.

Separate the brake tube from the master cylinder assembly with a flare nut wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

5.

Remove master cylinder mounting nuts.

6.

Separate the brake fluid level switch harness connector.

7.

Separate the pressure sensor harness connector (with ICC).

8.

Remove the master cylinder assembly.

CAUTION:

• Depress the brake pedal several times to release the vacuum pressure from the brake booster.

Then remove the master cylinder assembly.

• Never depress the brake pedal after the master cylinder assembly is removed.
• The piston of the master cylinder assembly is exposed. Never damage it when removing the

master cylinder.

1.

Reservoir cap

2.

Oil strainer

3.

Reservoir tank

4.

Brake fluid level switch connector

5.

Grommet

6.

Cylinder body

7.

Pressure sensor

8.

Pin

: Apply silicone grease.

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

JPFIA0377GB

BRAKE MASTER CYLINDER

BR-31

< REMOVAL AND INSTALLATION >

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• The piston may drop off when pulled out strongly. Never hold the piston. Hold the cylinder body

when handling the master cylinder assembly.

INSTALLATION

CAUTION:

Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it
off immediately and wash with water if it gets on a painted surface.
Note the following, and install in the reverse order of removal.
• Never depress the brake pedal after the master cylinder assembly is removed.
• Apply silicone grease to the brake booster [see (A) in the figure]

when installing the master cylinder assembly to the brake booster.

• The piston of the master cylinder assembly is exposed. Never

damage it when handling the master cylinder and check that no dirt
and dust are present on the piston before installation. Clean it with
new brake fluid if necessary.

• The piston may drop off when pulled strongly. Never hold the pis-

ton. Hold the cylinder body when handling the master cylinder
assembly.

• Never reuse the O ring.
• Temporarily tighten the brake tube flare nut to the master cylinder

assembly by hand. Then tighten it to the specified torque with a
flare nut crowfoot and torque wrench. Refer to 

BR-20, "FRONT : Exploded View"

.

CAUTION:

Never scratch the flare nut and the brake tube.

• After installation, perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

CAUTION:

Never reuse drained brake fluid.

Disassembly and Assembly

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DISASSEMBLY

CAUTION:

• Never disassemble the cylinder body.
• Remove the reservoir tank only when necessary.

1.

Fix the master cylinder assembly to a vise.

CAUTION:

Always set copper plates or cloth between vise grips when fixing the cylinder body to a vise.
Never overtighten the vise.

2.

Remove the reservoir tank mounting pin with a pin punch.

3.

Remove the reservoir tank and grommet from the cylinder body.

CAUTION:

Never drop the removed parts. The parts must not be
reused if they are dropped.

4.

Remove the pressure sensor (with ICC).

ASSEMBLY

1.

Install the pressure sensor (with ICC).

2.

Apply new brake fluid to the grommet and install it to the cylinder body.

CAUTION:

• Never use mineral oil such as gasoline or light oil.
• Never reuse the grommets.

3.

Install the reservoir tank to the cylinder body.

CAUTION:

• Never drop the parts when installing. The parts must not be reused if they are dropped.
• Never reuse the reservoir tank.

JPFIA0013ZZ

JPFIA0378ZZ

BR-32

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

4.

Fix the cylinder body to a vise.

CAUTION:

• Place the reservoir tank with the chamfered pin hole (

)

facing up.

• Always set copper plates or cloth between vise grips

when fixing the cylinder body to a vise. Never overtighten
the vise.

5.

Tilt the reservoir tank so that a mounting pin can be inserted.
Insert a mounting pin. Return the reservoir tank to the horizontal
position. Insert another mounting pin into the pin hole on the
opposite side in the same manner after the mounting pin passes
through the cylinder body pin hole.

CAUTION:

Never reuse the mounting pins.

Inspection

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INSPECTION AFTER INSTALLATION

Fluid Leak

Check for brake fluid leakage from the cylinder body-to-brake booster mounting face, reservoir tank mounting
face and brake tube connections.

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