Infiniti FX35, FX50 (S51). Manual - part 237

FRONT DISC BRAKE

BR-45

< REMOVAL AND INSTALLATION >

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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 and copper washers to brake caliper assembly, and tighten union bolts to the specified
torque. Refer to 

BR-20, "FRONT : Exploded View"

.

CAUTION:

Never reuse copper washer.

4.

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

BR-11, "Bleeding Brake System"

.

CAUTION:

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

5.

Check a drag of front disc brake. If any drag is found, refer to 

BR-46, "BRAKE CALIPER ASSEMBLY (2

PISTON TYPE) : Inspection"

.

BRAKE CALIPER ASSEMBLY (2 PISTON TYPE) : Disassembly and Assembly

INFOID:0000000005234203

DISASSEMBLY

NOTE:
Never remove the torque member and pad retainers when disassembling and assembling the cylinder body.

1.

Remove the sliding pin bolt, and remove the cylinder body from the torque member. Refer to 

BR-39,

"BRAKE PAD (2 PISTON TYPE) : Exploded View"

.

CAUTION:

Never drop brake pads, shims, shim covers and pad retainers from torque member.

2.

Remove brake pads, shims and shim covers.

3.

Remove sliding pins and sliding pin boots from torque member.

4.

Remove bushing from sliding pin.

5.

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

CAUTION:

Never get fingers caught in the pistons.

6.

Remove piston seal from cylinder body using suitable tool.

CAUTION:

Be careful not to damage a cylinder inner wall.

7.

Remove bleeder valve and cap.

BRB0032D

SFIA0141E

BR-46

< REMOVAL AND INSTALLATION >

FRONT DISC BRAKE

ASSEMBLY

1.

Install bleeder valve and cap.

2.

Apply rubber grease to piston seals (1), and install them to cylin-
der body.

CAUTION:

Never reuse piston seals.

3.

Apply rubber grease to piston boots (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 boots.

4.

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

CAUTION:

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

5.

Apply rubber grease to bushing, and install bushing to sliding
pin.

6.

Apply rubber grease to sliding pins and sliding boots, and install
sliding pins and sliding pin boots to torque member.

7.

Install the cylinder body to the torque member and tighten the
sliding pin bolts to the specified torque. Refer to 

BR-39, "BRAKE

PAD (2 PISTON TYPE) : Exploded View"

.

BRAKE CALIPER ASSEMBLY (2 PISTON TYPE) : Inspection

INFOID:0000000005234204

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 rust, wear, cracks or damage. Replace the member if any abnormal condition is
detected.

Pistons

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.

Sliding Pin and Sliding Pin Boot

JPFIA0032ZZ

JPFIA0033ZZ

JPFIA0034ZZ

FRONT DISC BRAKE

BR-47

< REMOVAL AND INSTALLATION >

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

INSPECTION AFTER INSTALLATION

1.

Check a drag of front disc brake. If any drag is found, follow the procedure described below.

2.

Remove brake pads.

3.

Press the pistons.

CAUTION:

• Never damage the piston boot.
• When 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.

NOTE:
Use a disc brake piston tool to easily press piston.

4.

Install brake pads.

5.

Depress the brake pedal several times.

6.

Check a drag of front disc brake again. If any drag is found, disassemble the cylinder body. Refer to 

BR-

45, "BRAKE CALIPER ASSEMBLY (2 PISTON TYPE) : Disassembly and Assembly"

.

7.

Burnish contact surface between disc rotor and brake pads after refinishing or replacing disc rotor, or if a
soft pedal occurs at very low mileage. Refer to 

BR-14, "DISC ROTOR : Inspection and Adjustment"

.

BRAKE CALIPER ASSEMBLY (4 PISTON TYPE)

BRAKE CALIPER ASSEMBLY (4 PISTON TYPE) : Exploded View

INFOID:0000000005234205

REMOVAL

DISASSEMBLY

1.

Caliper

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPFIA0464GB

BR-48

< REMOVAL AND INSTALLATION >

FRONT DISC BRAKE

BRAKE CALIPER ASSEMBLY (4 PISTON TYPE) : Removal and Installation

INFOID:0000000005234206

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-10, "Draining"

.

CAUTION:

Never spill or splash brake fluid on the disc rotor and caliper.

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 assembly and the disc rotor before removing

the disc rotor.

• Never drop disc rotor.

INSTALLATION

1.

Piston

2.

Piston seal

3.

Piston boot

4.

Retaining ring

5.

Bleeder Valve

6.

Cap

7.

Cap

8.

Caliper

: Apply rubber grease.

: Apply brake fluid.

Refer to 

GI-4, "Components"

 for symbols not described on the above.

JPFIA0386GB