Infiniti G37 Coupe. Manual - part 251

BR-42

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FRONT DISC BRAKE

2.

Remove clips (1) from pad pins.

3.

Remove pad pins while holding down cross spring, then remove
cross spring from caliper.

4.

Using pliers, remove brake pads and shims from caliper.

CAUTION:

• Never damage the piston boot.
• Never drop the brake pads, shims.

INSTALLATION

WARNING:

Clean any dust from the brake caliper and brake pads with a vacuum dust collector. Never blow with
compressed air.

CAUTION:

• Never depress the brake pedal while removing the brake pads because the piston may pop out.
• Never spill or splash brake fluid on the disc rotor.
1.

Apply copper based brake grease to the mating faces between the brake pads and shims, and install
shims to the brake pad.

CAUTION:

• Always replace the shims together when replacing the brake pad.
• Never damage the piston boot.
• In the case of replacing a pad with new one, check a brake fluid level in the reservoir tank

because brake fluid returns to master cylinder reservoir tank when pressing piston in.

2.

Install upper pad pin from the inner side, then install firmly to the outer side through the hole in the top of
brake pad.

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FRONT DISC BRAKE

BR-43

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3.

Place the top of cross spring (1) over the upper pad pin (2),
press in the cross spring, install lower pad pin from the inner
side to the outer side, and secure cross spring.

4.

Install clips to the pad pins. 

CAUTION:

If clip is not fully attached, pad pin or brake pad could fall
out while vehicle is in motion.

5.

Depress the brake pedal several times to check that no drag feel
is present for the front disc brake.

6.

Install tires.

BRAKE PAD (4 PISTON TYPE) : Inspection and Adjustment

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INSPECTION AFTER REMOVAL

Replace the shims if rust is excessively attached.

ADJUSTMENT AFTER INSTALLATION

Brake Burnishing Procedure

Burnish contact surfaces between pads according to following procedure after refinishing or replacing pads, or
if a soft pedal occurs at very low mileage.

CAUTION:

• Be careful of vehicle speed because the brake does not operate easily 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.

BRAKE CALIPER ASSEMBLY (1 PISTON TYPE)

BRAKE CALIPER ASSEMBLY (1 PISTON TYPE) : Exploded View

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1.

Bleeder valve

2.

Cap

3.

Brake hose

4.

Union bolt

5.

Copper washer

6.

Protector

7.

Bushing

8.

Location pin

9.

Sliding pin

10. Sliding pin boot

11.

Cylinder body

12. Piston seal

13. Piston

14. Piston boot

15. Torque member

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BR-44

< ON-VEHICLE REPAIR >

FRONT DISC BRAKE

BRAKE CALIPER ASSEMBLY (1 PISTON TYPE) : Removal and Installation

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REMOVAL

WARNING:

Clean any dust from the brake caliper and brake pads with a vacuum dust collector. Never blow with
compressed air.

CAUTION:

Never depress the brake pedal. Brake fluid may splash while removing the brake hose.

1.

Remove tires with power tool.

2.

Fix the disc rotor using wheel nuts.

3.

Drain brake fluid. Refer to 

BR-11, "Draining"

.

CAUTION:

Never spill or splash brake fluid on the disc rotor.

4.

Remove union bolt, and then disconnect brake hose from caliper assembly.

5.

Remove torque member mounting bolts, and remove brake cali-
per assembly.

CAUTION:

Never drop brake pads and caliper assembly.

6.

Remove disc rotor.

CAUTION:

• Put matching marks on the wheel hub and bearing assem-

bly and the disc rotor before removing the disc rotor.

• Never drop disc rotor.

INSTALLATION

WARNING:

Clean any dust from the brake caliper and brake pads with a vacuum dust collector. Never blow with
compressed air.

CAUTION:

Never depress the brake pedal. Brake fluid may splash while removing the brake hose.
1.

Install disc rotor.

CAUTION:

Align the matching marks that have been made during removal when reusing the disc rotor.

2.

Install the brake caliper assembly to the vehicle and tighten the torque member mounting bolts to the
specified torque.

CAUTION:

Never spill or splash any grease and moisture on the brake caliper assembly mounting face,
threads, mounting bolts and washers. Wipe out any grease and moisture.

3.

Install brake hose to brake caliper assembly, and tighten union bolts to the specified torque.

4.

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

BR-12, "Bleeding Brake System"

.

CAUTION:

• Never reuse drained brake fluid.
• Never spill or splash brake fluid on the disc rotor.

5.

Check that no drag feel is present for the front disc brake.

6.

Install tires.

16. Inner pad

17. Pad wear sensor

18. Pad retainer

19. Pad return spring

20. Outer pad

1: Apply rubber grease.

2: Apply bentonite noise damping brake grease.

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

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FRONT DISC BRAKE

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BRAKE CALIPER ASSEMBLY (1 PISTON TYPE) : Disassembly and Assembly

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DISASSEMBLY

NOTE:
The torque member, brake pads, pad return spring and pad retainers never need to be removed when disas-
sembling and assembling the cylinder body.

1.

Remove the protector and location pin and the sliding pin bolt, and remove the cylinder body from the
torque member.

CAUTION:

Never drop pads, pad return spring and pad retainers from torque member.

2.

Remove sliding pin and sliding pin boot from torque member.

3.

Place a wooden block as shown in the figure, and blow air from
union bolt mounting hole to remove piston and piston boot.

CAUTION:

Never get fingers caught in the pistons.

4.

Remove piston seal from cylinder body using suitable tool.

CAUTION:

Be careful not to damage a cylinder inner wall.

ASSEMBLY

1.

Apply brake fluid to piston seal (1), and install them to cylinder
body.

CAUTION:

Never reuse piston seal.

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