Infiniti Q45. Manual - part 256

 

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Infiniti Q45. Manual - part 256

 

 

FRONT DISC BRAKE

BR-25

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INSTALLATION 

1.

Apply PBC (Poly Butyl Cuprysil) or equivalent to the both sides
of inner shim and outer shim, install inner shim to inner pad, and
outer shim and outer shim cover to outer pad.

2.

Apply PBC (Poly Butyl Cuprysil) or equivalent to pad contact
surface on pad retainer, and install pad retainers and pads to
torque member.

CAUTION:

Inner pad and outer pad have pad-return mechanism on
upper side of pad retainer. When installing pad to torque
member, be sure to install pad return lever to pad wear sen-
sor securely.

3.

Install cylinder body to torque member.

CAUTION:

When replacing pads with new ones, press in piston until pads can be installed. In this case, care-
fully monitor brake fluid level in reservoir tank because brake fluid will return to master cylinder
reservoir tank.

4.

Install lower sliding pin bolt, and tighten it to the specified torque. Refer to 

BR-23, "Components"

 .

5.

Secure disc rotor with wheel nuts. Depress brake pedal a few times until it gets a responsive touch.

6.

Check brake for drag.

7.

Install tires to vehicle.

Removal and Installation of Brake Caliper Assembly

NFS000BS

REMOVAL 

1.

Remove tires from vehicle with a power tool.

2.

Drain brake fluid gradually from bleed valve while depressing brake pedal. Refer to 

BR-9, "Drain and

Refill"

 .

3.

Remove union bolts, and then remove brake hose from caliper
assembly.

4.

Remove torque member mounting bolts from torque member,
and remove caliper assembly from vehicle with a power tool.

5.

Remove disc rotor.

CAUTION:

Put matching make on both disc rotor and wheel hub when
removing disc rotor.

INSTALLATION 

1.

Install disc rotor.

CAUTION:

Align the marks of disc rotor and wheel hub, which were marked at the time of removal when reus-
ing disc rotor.

2.

Install caliper assembly to vehicle, and tighten mounting bolts to the specified torque. Refer to 

BR-23,

"Components"

 .

CAUTION:

Before installing torque member to vehicle, wipe oil and grease on washer seats on steering
knuckle and mounting surface of torque member.

3.

Install a projection of brake hose metal fitting by aligning with protrusions on cylinder body, and tighten
union bolts to the specified torque. Refer to 

BR-23, "Components"

 .

CAUTION:

Do not reuse copper washer for union bolts.

Assemble brake hose securely on caliper assembly.

4.

After installing caliper assembly, refill with new brake fluid and bleed air. Refer to 

BR-9, "BRAKE FLUID"

 .

5.

Install tires to vehicle.

SBR557E

SFIA0140E

BR-26

FRONT DISC BRAKE

Disassembly and Assembly of Brake Caliper Assembly

NFS000BT

NOTE:
Do not remove torque member, brake pads, shims, shim cover and pad retainer, when disassembling or
assembling cylinder body.

DISASSEMBLY

1.

Remove caliper assembly from vehicle. Refer to 

BR-25,

"Removal and Installation of Brake Caliper Assembly"

 .

2.

Remove sliding pin bolts from cylinder body, and remove pad,
shim, shim cover and pad retainer from torque member.

CAUTION:

When removing pad retainer from torque member, lift the
pad retainer in the direction shown by arrow (shown in the
figure) so as not to deform it.

3.

Remove sliding pins and sliding pin boots from torque member.

4.

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

CAUTION:

Do not get your fingers caught in piston.

5.

Using a flat-bladed screwdriver, remove piston seals from cylin-
der body.

CAUTION:

Be careful not to damage the inner wall of cylinder.

INSPECTION AFTER DISASSEMBLY
Cylinder Body

CAUTION:

Use new brake fluid to clean. Do not use mineral oils such as gasoline or kerosene.

Check the inner wall of cylinder for corrosion, wear, and damage. If a malfunction is detected, replace cyl-
inder body.

Minor flaws caused by corrosion or a foreign material can be removed by polishing a surface of the inner
wall with a fine sandpaper. Replace cylinder body, if necessary.

Torque Member

Check for wear, cracks, and damage. If a malfunction is detected, replace applicable part.

Piston

CAUTION:

The piston sliding surface is plated. Do not polish with sandpaper.
Check piston surface for corrosion, wear, and damage. If a malfunction is detected, replace applicable part.

SBR556E

BRB0032D

SFIA0141E

FRONT DISC BRAKE

BR-27

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Sliding Pin, Sliding Pin Bolt, and Sliding Pin Boot

Check sliding pins and sliding pin boots for wear, damage, and cracks. If a malfunction is detected, replace
applicable part.

ASSEMBLY

1.

Apply polyglycol ether based lubricant to piston seal, and install
them to the cylinder body.

2.

Apply rubber grease to piston boots. Cover the piston end with
piston boot, and install cylinder-side lip on piston boot properly
into groove on cylinder body.

CAUTION:

Do not reuse piston boot.

3.

Apply brake fluid to piston, and press piston into cylinder body
by hand to assemble piston-side lip on piston boot properly into
a groove on piston.

CAUTION:

Press piston evenly and change pressing point to prevent
inner wall of cylinder from being rubbed.

4.

Install sliding pins and sliding pin boots to the torque member.

5.

Install the torque member to the knuckle spindle and tighten the
mounting bolts to the specified torque. Refer to 

BR-23, "Compo-

nents"

 .

CAUTION:

Before installing torque member to vehicle, wipe oil and
grease on the washer seats on steering knuckle and the
mounting surface of the torque member.

6.

Install pad retainers to torque member.

7.

After assembling shims and shim covers to pad, install it to
torque member.

CAUTION:

Inner pad and outer pad have pad-return mechanism on the upper side of the pad retainer. When
installing pad, be sure to install pad return lever to pad wear sensor securely as shown in the fig-
ure.

8.

Install cylinder body, and tighten sliding pin bolt to specified torque. Refer to 

BR-23, "Components"

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9.

Install a projection of brake hose metal fitting by aligning with protrusions on cylinder body and tighten
union bolts to specified torque. Refer to 

BR-10, "Hydraulic Circuit"

 .

SFIA2920E

SFIA2432E

SBR574

SBR557E

BR-28

FRONT DISC BRAKE

CAUTION:

Assemble brake hose securely to protrusions on cylinder body.

Do not reuse copper washer for union bolts.

10. After installing caliper assembly, refill with new brake fluid and bleed air. Refer to 

BR-9, "BRAKE FLUID"

 .

DISC ROTOR INSPECTION
Visual Inspection

Check surfaces of disc rotor for uneven wear, cracks, and serious damage. If a malfunction is detected,
replace applicable part.

Run Out Inspection

1.

Using wheel nuts, fix disc rotor to wheels hub. (2 or more positions)

2.

Using a dial indicator, check run out.

CAUTION:

Before measuring, make sure that axle end play is 0 mm.

3.

If run out is outside limit, find the minimum run out point by shift-
ing the mounting positions of disc rotor and wheel hub by one
hole.

Thickness Inspection

1.

Using a micrometer, check thickness of disc rotor. If thickness is
outside standard, replace disc rotor.

2.

If run out is still out of specification, turn rotor with on-car brake
lathe (“MAD, DL-8700”, “AMMCO 700 and 705”or equivalent).

Brake Burnishing Procedure

NFS000BU

Burnish brake pad (or lining) contact surfaces of disc rotor according to following procedure after refinishing or
replacing drums or rotors, after replacing pads or linings, or if a soft pedal occurs at very low mileage.

CAUTION:

Be careful of vehicle speed because 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 brake.

4.

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

Measurement point

: At a point 10.0 mm (0.394 in) 
from outer edge of disc.

Run out limit

: 0.07 mm (0.0028 in) or less

SBR019B

Standard thickness

: 28.0 mm (1.102 in)

Wear limit

: 26.0 mm (1.024 in)

Maximum uneven wear 
(measured at 8 positions)

: 0.015 mm (0.0006 in) 
or less

SBR020B

 

 

 

 

 

 

 

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