Nissan Pathfinder. Manual - part 230

BR-28

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

BRAKE MASTER CYLINDER

Exploded View

INFOID:0000000009177190

Removal and Installation

INFOID:0000000009177191

REMOVAL 

CAUTION:

• Do not spill or 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.

• Do not reuse master cylinder O-rings.

• Do not reuse drained brake fluid.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Disconnect brake fluid level sensor harness connector.
2. Remove air duct assembly and air cleaner case. Refer to 

EM-24, "Exploded View"

.

3. Disconnect the hose from the reservoir tank.
4. Disconnect the brake pipes from the master cylinder assembly with a flare nut wrench.

CAUTION:

Do not scratch the flare nut or the brake pipe.

5. Remove the master cylinder assembly.

CAUTION:

1.

Sub tank cap

2.

Sub tank

3.

Sub tank bracket

4.

Clamp

5.

Hose

6.

Clamp

7.

Reservoir tank

8.

Grommet

9.

Cylinder body

10. Pin

11.

O-ring

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

Apply brake fluid.

AWFIA0882GB

BRAKE MASTER CYLINDER

BR-29

< REMOVAL AND INSTALLATION >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

Do not depress the brake pedal after the master cylinder assembly is removed.

INSTALLATION

CAUTION:

• Do not spill or 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.

• Do not reuse O-ring.

Installation is in the reverse order of removal.

• Apply PBC (Poly Butyl Cuprysil) silicone-based grease to the

brake booster (A) when installing the master cylinder assembly to

the brake booster.

• Temporarily tighten the brake tube flare nut to the master cylinder

assembly by hand. Then tighten it to the specified torque with a

crowfoot and torque wrench. Refer to 

BR-22, "FRONT : Exploded

View"

.

CAUTION:

Do not scratch the flare nut or the brake pipe.

• After installation, perform the air bleeding. Refer to 

BR-16, "Bleed-

ing Brake System"

.

Disassembly and Assembly

INFOID:0000000009177192

DISASSEMBLY

CAUTION:

• Do not disassemble the cylinder body.

• Remove the reservoir tank only when necessary.

• Do not drop removed parts. The parts must not be reused if they are dropped.
1. Secure the master cylinder assembly in a vise.

CAUTION:

Always use copper plates or cloth between vise and cylinder body. Do not overtighten the vise.

2. Remove the reservoir tank pin using suitable tools.

CAUTION:

Do not reuse the pin.

3. Remove the reservoir tank and grommets from the cylinder

body. Discard the grommets.

CAUTION:

• Do not drop parts. Dropped parts must not be reused.

• Do not reuse the grommets.

ASSEMBLY

1. Apply new brake fluid to the grommets and install them to the cylinder body.

CAUTION:

Do not use mineral oil such as gasoline or light oil.

2. Install the reservoir tank to the cylinder body.

CAUTION:

Do not drop the parts during installation. The parts must not be reused if they are dropped.

JPFIA0013ZZ

JPFIA0303ZZ

BR-30

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

3. Tilt the reservoir tank so that the pin can be inserted. Insert a pin

using suitable tools. 

CAUTION:

Do not reuse the pin.

JPFIA0303ZZ

BRAKE BOOSTER

BR-31

< REMOVAL AND INSTALLATION >

C

D

E

G

H

I

J

K

L

M

A

B

BR

N

O

P

BRAKE BOOSTER

Exploded View

INFOID:0000000009177193

Removal and Installation

INFOID:0000000009729279

REMOVAL

1. Remove instrument lower panel LH. Refer to 

IP-25, "Removal and Installation"

.

2. Remove harness clip.
3. Remove the snap pin (1) and clevis pin (2) from the brake pedal.

4. Remove the cowl top extension. Refer to 

EXT-25, "Removal and Installation"

.

5. Disconnect vacuum hose from brake booster. Refer to 

BR-33, "Removal and Installation"

.

6. Remove master cylinder assembly. Refer to 

BR-28, "Removal and Installation"

.

7. Disconnect the harness connector from the booster pressure sensor.
8. Disconnect the I-Key sensor from the strut tower and place aside.
9. Remove the four nuts on the brake booster and brake pedal assembly.

CAUTION:

Secure the brake booster to avoid damage to components.

10. Remove the brake booster from the dash panel on the engine room side.

CAUTION:

Do not deform or bend the brake pipes.

INSTALLATION

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Clevis

5.

Gasket

AWFIA0953ZZ

JPFIA0019ZZ