Nissan Qashqai J11. Manual - part 899

BR-68

< REMOVAL AND INSTALLATION >

[RHD]

BRAKE MASTER CYLINDER

BRAKE MASTER CYLINDER

Exploded View

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HRA2DDT - MR20DD

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1.

Reservoir cap

2.

Reservoir tank

3.

Cylinder body

4.

Pin

5.

O-ring

6.

Grommet

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

 : Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

BRAKE MASTER CYLINDER

BR-69

< REMOVAL AND INSTALLATION >

[RHD]

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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.

Drain brake fluid. Refer to 

BR-55, "Draining"

.

2.

Disconnect the brake fluid level switch harness connector.

3.

Disconnect the brake tubes from the master cylinder assembly with a flare nut wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

4.

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.

• 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.

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1.

Reservoir cap

2.

Reservoir tank

3.

Cylinder body

4.

Pin

5.

Grommet

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

 : Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

BR-70

< REMOVAL AND INSTALLATION >

[RHD]

BRAKE MASTER CYLINDER

• Note the following, and installation is the reverse order of removal.

CAUTION:

• Never depress the brake pedal after the master cylinder assembly is removed.
• Apply PBC (Poly Butyl Cuprysil) silicone-based 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 piston. Hold the cylinder body when handling the master
cylinder assembly.

• 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 torque wrench. Refer to  

BR-63, "FRONT : Exploded View"

.

CAUTION:

Never scratch the flare nut and the brake tube.

• After installation, perform the air bleeding. Refer to 

BR-56, "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 if necessary.

1.

Fix the master cylinder assembly to a vise.

CAUTION:

Always set copper plates or cloth between vise 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.

ASSEMBLY

1.

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.

2.

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 reservoir tank.

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BRAKE MASTER CYLINDER

BR-71

< REMOVAL AND INSTALLATION >

[RHD]

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3.

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 when fix-

ing the cylinder body to a vise. Never overtighten the vise.

4.

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 pin.

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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