Infiniti G37 Coupe. Manual - part 252

BR-46

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FRONT DISC BRAKE

2.

Apply rubber grease to piston boot (1). Cover the piston (2) end
with piston boot, and then install cylinder side lip on piston boot
securely into a groove on cylinder body.

CAUTION:

Never reuse piston boot.

3.

Apply brake fluid to piston (1). Push piston into cylinder body by
hand and push piston boot (2) piston-side lip into the piston
groove.

CAUTION:

Press the piston evenly and vary the pressing point to pre-
vent cylinder inner wall from being rubbed.

4.

Install sliding pin and sliding pin boots to torque member.

5.

Install the cylinder body to the torque member and tighten the location pin and sliding pin bolt to the spec-
ified torque.

6.

Install the protector.

BRAKE CALIPER ASSEMBLY (1 PISTON TYPE) : Inspection and Adjustment

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INSPECTION AFTER DISASSEMBLY

Cylinder Body

Check the inner wall of the cylinder for rust, wear, cracks or damage. Replace the cylinder if any abnormal
condition is detected.

CAUTION:

Always clean with new brake fluid. Never clean with mineral oil such as gasoline and light oil.

Torque Member

• Check the torque member for wear, cracks or damage. Replace the torque member if any abnormal condi-

tion is detected.

• Eliminate rust on the torque member. Replace them if rust is excessively attached.

Piston

Check the surface of the piston for rust, wear, cracks or damage. Replace the piston if any abnormal condition
is detected.

CAUTION:

A piston sliding surface is plated. Never polish with sandpaper.

Location Pin, Protector and Bushing 

Check the location pin, protector and bushing for rust, wear, cracks or damage. Replace the parts if any abnor-
mal condition is detected.

Sliding Pin and Sliding Pin Boot

Check the sliding pin and sliding boots for rust, wear, cracks or damage. Replace the parts if any abnormal
condition is detected.

ADJUSTMENT AFTER INSTALLATION

Brake Burnishing Procedure

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FRONT DISC BRAKE

BR-47

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

CAUTION:

• Be careful of vehicle speed because the brake does not operate easily until pad 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 (4 PISTON TYPE)

BRAKE CALIPER ASSEMBLY (4 PISTON TYPE) : Exploded View

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1.

Piston

2.

Piston seal

3.

Piston boot

4.

Retaining ring

5.

Cap

6.

Bleeder valve

7.

Cap

8.

Clip

9.

Pad pin

10.

Caliper

11.

Inner shim

12.

Inner pad

13.

Pad wear sensor (RH inner pad 
only)

14.

Cross spring

15.

Outer pad

16.

Outer shim

1: Apply rubber grease.

2: Apply copper based brake grease.

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

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BR-48

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FRONT DISC BRAKE

BRAKE CALIPER ASSEMBLY (4 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 and brake tube.

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.

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

CAUTION:

• Cover flare nut wrench with a cloth as not to damage the caliper.
• Never scratch the flare nut and the brake tube.
• Never bend sharply, twist or strongly pull out the brake tube.
• Cover open end of brake tube when disconnecting to prevent entrance of dirt.

5.

Remove caliper mounting bolts, and remove caliper.

CAUTION:

Never drop brake pad and caliper.

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 to the vehicle and tighten the caliper mounting bolts to the specified torque.

CAUTION:

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

3.

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

CAUTION:

• Cover crowfoot with a cloth as not to damage the caliper.
• Never scratch the flare nut and the brake tube.

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.

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FRONT DISC BRAKE

BR-49

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BRAKE CALIPER ASSEMBLY (4 PISTON TYPE) : Disassembly and Assembly

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DISASSEMBLY

1.

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

CAUTION:

Never get fingers caught in the pistons.

2.

Remove piston seal (1) from cylinder body using suitable tool
(A).

CAUTION:

Be careful not to damage a cylinder inner wall.

ASSEMBLY

1.

Apply brake fluid to piston seals (1), and install them to caliper.

CAUTION:

Never reuse piston seals.

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