Murano Cross Cabriolet Z51 (2013 year). Manual - part 15

REAR DISC BRAKE

BR-17

< PERIODIC MAINTENANCE >

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• Check in advance that the thickness of the disc rotor is wear thickness + 0.3 mm (0.012 in) or

more.

• If the thickness is less than wear thickness + 0.3 mm (0.012 in), replace the disc rotor.

Thickness

Check the thickness of the disc rotor using a micrometer. Replace
the disc rotor if the thickness is below the wear limit. 

ADJUSTMENT

CAUTION:

• Burnish contact surfaces between pads according to the following procedure after refinishing or

replacing pads, or if a soft pedal occurs at very low mileage.

• Be careful of vehicle speed because the brake does not operate firmly/securely until pads and disc

rotor are securely fitted.

• Only perform this procedure under safe road and traffic conditions. Use extreme caution.

1.

Drive vehicle on straight, flat road.

2.

Depress brake pedal with the power to stop vehicle within 3 to 5 seconds until the vehicle stops.

3.

Drive without depressing brake for a few minutes to cool the brake.

4.

Repeat steps 1 to 3 until pad and disc rotor are securely fitted.

Limit

Wear thickness

: Refer to 

BR-52, "Rear Disc Brake"

.

Limit

Wear thickness

: Refer to 

BR-52, "Rear 

Disc Brake"

.

Thickness variation

: Refer to 

BR-52, "Rear 

Disc Brake"

.

SBR020B

Revision: 2012 October

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BR-18

< REMOVAL AND INSTALLATION >

BRAKE PEDAL

REMOVAL AND INSTALLATION

BRAKE PEDAL

Exploded View

INFOID:0000000008459945

Removal and Installation

INFOID:0000000008459946

REMOVAL

1.

Remove instrument lower panel LH. Refer to 

IP-12, "Exploded View"

.

2.

Remove knee protector. Refer to 

ST-31, "Removal and Installation"

.

3.

Disconnect the stop lamp switch and ASCD brake switch harness connectors.

4.

Remove snap pin and clevis pin from clevis of brake booster.

5.

Remove the brake pedal assembly.

CAUTION:

Hold the brake booster and master cylinder so as not to drop out or contact them to other parts.

INSTALLATION

Note the following, and install the reverse order of removal.
• Apply the multi-purpose grease to the clevis pin and the mating faces. (Not necessary if grease has been

already applied.)

NOTE:
The clevis pin may be inserted in either direction.

1.

Clevis pin

2.

Brake pedal assembly

3.

Brake pedal pad

4.

ASCD brake switch

5.

Stop lamp switch

6.

Clip

7.

Snap pin

: Apply multi-purpose grease.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

JPFIA0440GB

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BRAKE PEDAL

BR-19

< REMOVAL AND INSTALLATION >

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Inspection and Adjustment

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INSPECTION AFTER REMOVAL

• Check the following items and replace the brake pedal assembly if

necessary.

- Check the brake pedal upper rivet (made by aluminum) (A) for

deformation.

- Check the brake pedal for bend, damage, and cracks on the

welded parts.

- Check the lapping length (X) of sub-bracket (B) and slide plate (C).

• Check clevis pin and plastic stopper (A) for damage and deforma-

tion. If any damage is found, replace clevis pin.

ADJUSTMENT AFTER INSTALLATION

Perform the brake pedal adjustment after installing the brake pedal assembly. Refer to 

BR-7, "Inspection and

Adjustment"

.

Standard

X

: 5.0 mm (0.197 in) or more

JPFIA0300ZZ

PFIA0756J

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BR-20

< REMOVAL AND INSTALLATION >

BRAKE PIPING

BRAKE PIPING

FRONT

FRONT : Exploded View

INFOID:0000000008459948

1.

Brake tube

2.

ABS actuator and electric unit (con-
trol unit)

3.

Connector

4.

Connector bracket

5.

Master cylinder assembly

6.

Brake booster

7.

Lock plate

8.

Brake hose

9.

Union bolt

10. Copper washer

A.

To front brake hose

B.

To rear brake tube

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPFIA0297GB

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BRAKE PIPING

BR-21

< REMOVAL AND INSTALLATION >

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FRONT : Hydraulic Piping

INFOID:0000000008459949

FRONT : 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 tires with power tool.

2.

Drain brake fluid. Refer to 

BR-10, "Draining"

.

3.

Loosen the flare nut with a flare nut wrench and separate the brake tube from the hose.

CAUTION:

• Never scratch the flare nut and the brake tube.
• Never bend sharply, twist or strongly pull out the brake hoses and tubes.
• Cover open end of brake tubes and hoses when disconnecting to prevent entrance of dirt.

4.

Remove the union bolt and copper washers, and remove the brake hose from the brake caliper assembly.

5.

Remove the lock plate and remove the brake hose.

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.

1.

Assemble the union bolt and the copper washers to the brake hose.

CAUTION:

Never reuse the copper washer.

1.

ABS actuator and electric unit (con-
trol unit)

2.

Front disc brake

3.

Master cylinder assembly

4.

Brake booster

5.

Connector

6.

Rear disc brake

A.

Brake tube

B.

Brake hose

: Flare nut

: Union bolt

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BR-22

< REMOVAL AND INSTALLATION >

BRAKE PIPING

2.

Align the brake hose pin to the projection (A) of the brake caliper
assembly and tighten the union bolt (1) to the specified torque.

3.

Install the brake tube to the brake hose, temporarily tighten the
flare nut by hand until it does not rotate further, and fix the brake
hose to the bracket with the lock plate.

CAUTION:

Check that all brake hoses and tubes are not twisted and
bent.

4.

Tighten the flare nut to the specified torque with a crowfoot and
torque wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

5.

Refill with new brake fluid and perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

FRONT : Inspection

INFOID:0000000008459951

INSPECTION AFTER INSTALLATION

1.

Check the brake hoses and tubes for the following: no scratches; no twist and deformation; no interfer-
ence with other components when steering the steering wheel; no looseness at connections.

2.

Depress the brake pedal with a force of 785 N (80 kg, 176 lb) and hold down the pedal for approximately
5 seconds with the engine running. Check for any fluid leakage.

CAUTION:

Retighten the applicable connection to the specified torque and repair any abnormal (damaged,
worn or deformed) part if any brake fluid leakage is present.

REAR

REAR : Exploded View

INFOID:0000000008459952

JPFIA0011ZZ

JPFIA0450GB

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BRAKE PIPING

BR-23

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REAR : Hydraulic Piping

INFOID:0000000008459953

REAR : 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 tires with power tool.

2.

Drain brake fluid. Refer to 

BR-10, "Draining"

.

3.

Loosen the flare nut with a flare nut wrench and separate the brake tube from the hose.

CAUTION:

• Never scratch the flare nut and the brake tube.
• Never sharply bend, twist or strongly pull the brake hoses and tubes.
• Cover the open end of brake tubes and hoses when disconnecting to prevent entrance of dirt.

4.

Remove the union bolt and copper washers, and remove the brake hose from the brake caliper assembly.

5.

Remove the lock plate and remove the brake hose from the vehicle.

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.

1.

Assemble the union bolt and the copper washers to the brake hose.

CAUTION:

Never reuse copper washer.

1.

Brake tube

2.

Lock plate

3.

Brake hose

4.

Union bolt

5.

Copper washer

A.

To connector

B.

To rear brake hose

C.

To brake tube

Refer to 

GI-4, "Components"

 for symbols in the figure.

1.

ABS actuator and electric unit (con-
trol unit)

2.

Front disc brake

3.

Master cylinder assembly

4.

Brake booster

5.

Connector

6.

Rear disc brake

A.

Brake tube

B.

Brake hose

: Flare nut

: Union bolt

JPFIA0456ZZ

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BR-24

< REMOVAL AND INSTALLATION >

BRAKE PIPING

2.

Install the brake hose L-pin by aligning it with the brake caliper
assembly positioning hole, and tighten the union bolt (1) to the
specified torque.

3.

Connect the hose to the brake tube, temporarily tighten the flare
nut by hand until it does not rotate further, and fix the brake hose
to the bracket with the lock plate.

CAUTION:

Check that the brake hoses and tubes are not twisted and
bent.

4.

Tighten the flare nut to the specified torque with a crowfoot and
torque wrench.

CAUTION:

Never scratch the flare nut and the brake tube.

5.

Refill with new brake fluid and perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

REAR : Inspection

INFOID:0000000008459955

INSPECTION AFTER INSTALLATION

1.

Check the brake hoses and tubes for the following: no scratches; no twist and deformation; no interfer-
ence with other components when steering the steering wheel; no looseness at connections.

2.

Depress the brake pedal with a force of 785 N (80 kg, 176 lb) and hold down the pedal for approximately
5 seconds with the engine running. Check for any fluid leakage.

CAUTION:

Retighten the applicable connection to the specified torque and repair any abnormal (damaged,
worn or deformed) part if any brake fluid leakage is present.

JPFIA0012ZZ

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BRAKE MASTER CYLINDER

BR-25

< REMOVAL AND INSTALLATION >

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BRAKE MASTER CYLINDER

Exploded View

INFOID:0000000008459956

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-10, "Draining"

.

2.

Separate the brake fluid level switch harness connector.

3.

Remove sub tank and hose.

4.

Remove cowl top cover. Refer to 

EXT-20, "Exploded View"

.

5.

Remove front wiper drive assembly. Refer to 

WW-43, "Exploded View"

.

6.

Remove extension cowl top. Refer to 

EXT-20, "Exploded View"

.

7.

Remove air duct assembly and air cleaner case. Refer to 

EM-26, "Exploded View"

.

8.

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

CAUTION:

Never scratch the flare nut and the brake tube.

9.

Remove the master cylinder assembly.

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.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

JPFIA0426GB

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BR-26

< REMOVAL AND INSTALLATION >

BRAKE MASTER CYLINDER

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.
Note the following, and install the reverse order of removal.
• 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 cyl-
inder 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.

• 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-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

INFOID:0000000008459958

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.

JPFIA0013ZZ

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BRAKE MASTER CYLINDER

BR-27

< REMOVAL AND INSTALLATION >

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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.

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

INFOID:0000000008459959

INSPECTION AFTER INSTALLATION

Fluid Leak

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

JPFIA0304ZZ

JPFIA0303ZZ

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BR-28

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

BRAKE BOOSTER

Exploded View

INFOID:0000000008459960

Removal and installation

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REMOVAL

1.

Remove brake master cylinder assembly. Refer to 

BR-25, "Exploded View"

.

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.

2.

Remove vacuum hose from brake booster. Refer to 

BR-31, "Exploded View"

.

3.

Remove snap pin (1) and clevis pin (2) from inside vehicle.

4.

Remove nuts on brake booster and brake pedal assembly.

CAUTION:

Hold the brake booster so as to avoid dropping out.

5.

Remove brake booster from dash panel in engine room side.

CAUTION:

Never deform or bend the brake tubes.

INSTALLATION

Note the following, and installation is the reverse order of removal.
• Be careful not to damage brake booster stud bolt threads. If brake booster is tilted during installation, the

dash panel may damage the threads.

• Never deform or bend the brake tubes when installing the brake booster.
• Always use a new gasket between the brake booster.

1.

Master cylinder assembly

2.

Brake booster

3.

Lock nut

4.

Clevis

5.

Gasket

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPFIA0425GB

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BRAKE BOOSTER

BR-29

< REMOVAL AND INSTALLATION >

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• Replace the clevis pin if it is damaged. Refer to 

BR-19, "Inspection and Adjustment"

.

• After installation, perform the air bleeding. Refer to 

BR-11, "Bleeding Brake System"

.

CAUTION:

Never reuse drained brake fluid.

Inspection and Adjustment

INFOID:0000000008459962

INSPECTION AFTER REMOVAL

Air Tight

CAUTION:

Check the air tight condition when the master cylinder and the brake booster is installed.

1.

With a handy vacuum pump, apply vacuum pressure of –66.7 kPa (–500 mmHg, –19.70 inHg) to the
brake booster.

2.

If the air tight condition cannot be maintained, perform the following operation.

a.

Check the no dirt and dust are present on the brake booster and brake master cylinder mating faces.
Clean it if necessary.

b.

Check O-ring on the master cylinder. If anything is found, replace the O-ring.

c.

Check the air tight condition again. If the condition still cannot be maintained, replace the brake booster.

Input Rod Length Inspection

1.

Loosen the lock nut (1) and adjust the input rod (2) to the speci-
fied length (B).

2.

Tighten the lock nut to the specified torque.

INSPECTION AFTER INSTALLATION

Operation

Depress the brake pedal several times at 5-second intervals with the
engine stopped. Start the engine with the brake pedal fully
depressed. Check that the clearance between brake pedal and dash
lower pane decreases.
NOTE:
A slight impact with a small click may be felt on the pedal when the
brake pedal is fully depressed. This is a normal phenomenon due to
the brake system operation.

Air Tight

Standard

B

: Refer to 

BR-51, "Brake 

Booster"

.

JPFIA0020ZZ

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BR-30

< REMOVAL AND INSTALLATION >

BRAKE BOOSTER

• Idle the engine for 1 minute to apply vacuum to the brake booster,

and stop the engine. Then depress the brake pedal several times
at 5-second intervals until the accumulated vacuum is released to
atmospheric pressure. Check that the clearance between brake
pedal and dash lower panel gradually increases (A 

→

 B 

→

 C) each

time the brake pedal is depressed during this operation.

• Depress the brake pedal with the engine running. Then stop the

engine while holding down the brake pedal. Check that the brake
pedal stroke does not change after holding down the brake pedal
for 30 seconds or more.
NOTE:
A slight impact with a small click may be felt on the pedal when the
brake pedal is fully depressed. This is a normal phenomenon due
to the brake system operation.

ADJUSTMENT AFTER INSTALLATION

Perform the brake pedal adjustment after installing the brake pedal assembly. Refer to 

BR-7, "Inspection and

Adjustment"

.

JPFIA0043ZZ

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VACUUM LINES

BR-31

< REMOVAL AND INSTALLATION >

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VACUUM LINES

Exploded View

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Removal and Installation

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REMOVAL

Remove the vacuum hose and tube.

INSTALLATION

Note the following, install the vacuum hose and tube.
• Because vacuum hose contains a check valve, it must be installed in the correct position. Refer to the stamp

to confirm correct installation. Brake booster will not operate normally if the hose is installed in the wrong
direction. 

• When installing vacuum hose, insert it until its tip reaches the

back-end of length (A) or further as shown in the figure.

- Face the marking side up when assembling of vacuum hose.

(Brake booster and intake manifold side)

- Face the marking side vehicle front when assembling of vacuum

hose. (Vacuum tube side)

CAUTION:

Never use lubricating oil during assembly.

Inspection

INFOID:0000000008459965

INSPECTION AFTER REMOVAL

Appearance

Check for correct assembly, damage and deterioration.

Check Valve Airtightness

1.

Clamp

2.

Vacuum hose (built in check valve)

3.

Vacuum tube

4.

Vacuum hose

A.

To intake manifold

B.

Paint mark

C.

Stamp indicating engine direction

D.

To brake booster

JPFIA0306ZZ

Standard 

A

: 24 mm (0.95 in) or more

JPFIA0023ZZ

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BR-32

< REMOVAL AND INSTALLATION >

VACUUM LINES

• Use a handy vacuum pump (A) to check.

• Replace vacuum hose assembly if vacuum hose and check valve

are malfunctioning.

When connected to the brake booster side (B)

: Vacuum should decrease within 1.3 kPa (10 mm-
Hg, 0.39 inHg) for 15 seconds under a vacuum of 

−

66.7 kPa (

−

500 mmHg, 

−

19.70 inHg).

When connected to the engine side (C):             

: Vacuum should not exist.

JPFIA0024ZZ

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