Infiniti Q45. Manual — part 255
BRAKE BOOSTER
BR-21
C
D
E
G
H
I
J
K
L
M
A
B
BR
Removal and Installation
NFS000BL
REMOVAL
CAUTION:
●
Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
●
Be careful not to deform or bend brake pipes, during removal of booster.
1.
Remove vacuum hose from brake booster.
2.
Remove master cylinder. Refer to
.
3.
Disconnect solenoid harness connector from brake booster assembly (only ICC model).
4.
Remove snap pin and clevis pin on the clevis in the passenger room, and remove input rod from brake
pedal.
5.
Remove the mounting nuts on pedal bracket.
6.
Remove booster assembly from the engine room.
INSPECTION AFTER REMOVAL
Output Rod Length Inspection
1.
Using a handy vacuum pump, apply a vacuum of – 66.7 kPa (–
500 mmHg,19.69 inHg) to brake booster.
2.
Check output rod length.
INSTALLATION
1.
Loosen the lock nut to adjust input rod length so that the length
“B” (in the figure on the left) satisfies the specified value.
2.
After adjusting “B”, temporarily tighten the lock nut to install the
booster assembly to vehicle. At this time, make sure to install a
gasket between booster assembly and vehicle.
3.
Connect the brake pedal with clevis of input rod.
4.
Install the pedal bracket mounting nuts and tighten them to the
specified torque. Refer to
5.
Install master cylinder to booster assembly. Refer to
6.
Connect solenoid harness connector to brake booster assembly (only ICC model).
7.
Adjust the height and play of brake pedal. Refer to
BR-6, "Inspection and Adjustment"
8.
Tighten the lock nut of input rod to the specified torque. Refer to
9.
.
Standard dimension when vacuum
−
66.7 kPa (
−
500 mmHg,
−
19.69 inHg)
Without ICC:
:
−
6.2 mm (
−
0.24 in)
With ICC:
: 10.4 mm (0.409 in)
SBR208E
Length “B”
: 125 mm (4.92 in)
SGIA0060E
BR-22
VACUUM LINES
VACUUM LINES
PFP:41920
Components
NFS000BM
Removal and Installation
NFS000BN
CAUTION:
●
Because vacuum hose contains a check valve, it must be
installed in the correct direction. Refer to the stamp or label
to confirm correct installation. The brake booster will not
operate normally if hose is installed in the wrong direction.
●
Position clip with clip position stamp when installing clip to
vacuum hose.
●
Insert vacuum hose for at least 24 mm (0.94 in).
●
Do not use lubricating oil during assembly.
Inspection
NFS000BO
VISUAL INSPECTION
Check for improper assembly, damage and deterioration.
CHECK VALVE INSPECTION
Airtightness Inspection
Use a handy vacuum pump to check.
1.
For intake manifold
2.
Clamp
3.
Vacuum hose (Build-in check valve)
4.
Clip position stamp
5.
Clip
6.
Engine side indicator stamp
7.
For brake booster
SFIA2646E
SBR225B
When connected to booster side (1):
Vacuum decrease should be within 1.3 kPa (10
mmHg, 0.39 inHg) for 15 seconds under a vacuum
of
−
66.7 kPa (
−
500 mmHg,
−
19.69 inHg)
When connected to engine side (2):
No vacuum will be applied
SFIA0210E
FRONT DISC BRAKE
BR-23
C
D
E
G
H
I
J
K
L
M
A
B
BR
FRONT DISC BRAKE
PFP:41000
On-Vehicle Inspection
NFS000BP
PAD WEAR INSPECTION
●
Check pad thickness from check hole on cylinder body.
Components
NFS000BQ
WARNING:
Clean dust on caliper and brake pad with a vacuum dust collector to minimize the hazard of airborne
particles or other materials. Do not blow with compressed air.
CAUTION:
●
While removing cylinder body, do not depress brake pedal because piston will pop out.
Standard thickness
: 10.0 mm (0.394 in)
Repair limit thickness
: 2.0 mm (0.079 in)
MAA0439D
1.
Union bolt
2.
Copper washer
3.
Cap
4.
Bleed valve
5.
Sliding pin bolt
6.
Cylinder body
7.
Piston seal
8.
Piston
9.
Piston boot
10. Inner shim
11.
Inner pad
12. Pad retainer
13. Outer pad
14. Outer shim
15. Outer shim cover
16. Torque member mounting bolt
17. Sliding pin
18. Washer
19. Bushing
20. Torque member
21. Sliding pin boot
A:
After tightening the bolts to the specified torque, tighten the bolts additionally by turning the bolts 32 to 37 degrees.
Refer to
and the followings for the symbols in the figure.
1: Apply rubber grease.
2: Apply PBC (Poly Butyl Cuprysil) grease or silicone-based grease.
3: Apply polyglycol ether based lubricant.
: Apply brake fluid.
PFIA0693E
BR-24
FRONT DISC BRAKE
●
It is not necessary to remove torque member mounting bolts on torque member and brake hose
except for disassembly or replacement of caliper assembly. In this case, hang cylinder body with a
wire so that brake hose is not under tension.
●
Do not damage piston boot.
●
Always replace shim and shim covers as a set when replacing brake pads.
●
Keep rotor clean off brake fluid.
Removal and Installation of Brake Pad
NFS000BR
REMOVAL
WARNING:
Clean brake pads with a vacuum dust controller to minimize a hazard of airborne particles or other
materials.
CAUTION:
●
When cylinder body is opened, do not depress brake pedal because piston will pop out.
●
Be careful not to damage piston boot or get oil on disc rotor. Always replace shims in replacing
pads.
●
If shims are rusted or show peeling of rubber coat, replace them with new shims.
●
It is not necessary to remove torque member mounting bolt except for disassembly or replace-
ment of caliper assembly. In this case, suspend cylinder body with wire so as not to stretch brake
hose.
●
Carefully monitor brake fluid level because brake fluid will return to reservoir when pushing back
piston.
●
Burnish brake contact surfaces after refinishing or replacing drums or rotors, after replacing pads
or linings, or if a soft pedal occurs at very low mileage. Refer to
BR-28, "Brake Burnishing Proce-
1.
Remove tires from vehicle with a power tool.
2.
Remove lower sliding pin bolt.
3.
Hang cylinder body with a wire, and remove pads, pad retainers,
shims from torque member.
CAUTION:
●
Do not damage piston boot.
●
Keep rotor clean, off brake fluid.
●
When removing pad retainer from torque member, lift pad
retainer in the direction shown by arrow (shown in the
figure) so as not to deform it.
●
Do not damage piston boot.
●
Keep rotor clean, off brake fluid.
SBR433D
SBR556E
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