Infiniti Q45. Manual — part 253
BRAKE MASTER CYLINDER
BR-13
C
D
E
G
H
I
J
K
L
M
A
B
BR
BRAKE MASTER CYLINDER
PFP:46010
On-Vehicle Inspection
NFS000BH
LEAK INSPECTION
●
Check for leaking in a master cylinder installation surface, a reservoir tank installation surface, and brake
tube connections.
Removal and Installation
NFS000BI
REMOVAL
1.
Drain brake fluid. Refer to
2.
Remove harness connectors for the brake fluid level switch and pressure sensor (Models with ICC).
3.
Using a flare nut wrench, remove brake tube from master cylinder.
4.
Remove mounting nuts, and remove master cylinder assembly from vehicle.
INSTALLATION
CAUTION:
●
Refill with new brake fluid “DOT 3”.
●
Do not reuse the drained brake fluid.
1.
Temporarily tighten the flare nuts on brake tube to master cylinder by hand.
2.
Install master cylinder to brake booster assembly, and tighten the mounting nuts to the specified torque.
Refer to
.
CAUTION:
●
Do not damage the sliding surface of the primary piston
rod and do not allow foreign materials on it's surface.
●
Do not reuse O-ring and primary piston.
●
Apply PBC (Poly Butyl Cuprysil) grease or silicon-based
grease or brake fluid for the O-ring and primary piston.
3.
Using a flare nut torque wrench, tighten the flare nut on the brake tube to the specified torque. Refer to
4.
Refill the new brake fluid and bleed air. Refer to
.
SFIA2614E
BR-14
BRAKE MASTER CYLINDER
Components
NFS000HZ
Disassembly and Assembly
NFS000BJ
DISASSEMBLY
Models without ICC
1.
Clamp the flange of the cylinder body in a vice in the figure.
CAUTION:
●
Pay attention to the orientation of master cylinder body.
●
Use the copper plate or closes for clamping the body in a
vise.
1.
Reservoir cap
2.
Oil filter
3.
Reservoir tank
4.
Grommet
5.
Piston stopper
6.
Pin
7.
Cylinder body
8.
O-ring
9.
Piston stopper
10. Pressure sensor
11.
Brake fluid level switch connector
12.
O-ring
13. Secondary piston assembly
14.
Primary piston assembly
15.
Plate
16. Guide assembly
17.
Plate (With ICC model only)
18.
Snap-ring
SFIA2483E
BRA0558D
BRAKE MASTER CYLINDER
BR-15
C
D
E
G
H
I
J
K
L
M
A
B
BR
2.
Using the pin-punch [commercial service tool: approx. 4 mm
(0.16 in) dia], remove pin from reservoir tank.
3.
Remove master cylinder assembly from a vise.
4.
Remove reservoir tank and grommet from cylinder body.
5.
Push primary piston assembly and remove piston stopper from
cylinder body.
CAUTION:
Be careful not to damage the inner wall of cylinder body.
6.
Remove snap ring while pressing in primary piston assembly.
CAUTION:
Be careful not to put out the piston.
7.
Holding the rod of the primary piston, remove primary piston
assembly, plate and guide with pulling straight to prevent cup
from being caught by the inner wall of the cylinder.
8.
Remove plate and guide on primary piston.
CAUTION:
Be careful not to damage the rod from the inner wall of the
plate.
9.
Tap the flange of cylinder body using a soft block such as wood,
and carefully pull the secondary piston assembly straight out to
prevent the inner wall of the cylinder from being damaged.
Models with ICC
CAUTION:
Be careful not to damage the rod of primary piston with covering cloths in acting.
BRA0559D
BRA0560D
BRA0561D
BRA0033D
BR-16
BRAKE MASTER CYLINDER
1.
Clamp the flange of cylinder body in a vise in the figure.
CAUTION:
●
Pay attention to the orientation of master cylinder body.
●
Use the copper plate or closes for clamping the body in a
vise.
2.
Push primary piston assembly and remove piston stopper from
secondary tank boss hole in cylinder body.
CAUTION:
Be careful not to damage the inner wall of the cylinder.
3.
Remove snap ring while pressing in piston assembly.
CAUTION:
Be careful not to put out the piston.
4.
Holding the rod of the primary piston, remove primary piston
assembly, plate and the guide assembly with pulling straight to
prevent cup from being caught by the inner wall of the cylinder.
5.
Remove plate and guide assembly on primary piston assembly.
CAUTION:
Be careful not to damage the rod by the inner wall of the
plate.
6.
Tap the flange of cylinder body using a soft block such as wood,
and carefully pull secondary piston assembly straight out to pre-
vent the inner wall of the cylinder from being damaged.
7.
Remove grommet and reservoir tank.
CAUTION:
Remove reservoir tank only when necessary.
INSPECTION AFTER DISASSEMBLY
Inspect the following items.
Cylinder Body
●
Check the inner wall of the cylinder for damage, wear, corrosion, and pin holes. Replace cylinder body if a
malfunction is detected.
ASSEMBLY
CAUTION:
●
Never use mineral oils such as kerosene or gasoline during the cleaning and assembly processes.
●
Make sure that there is no foreign material such as dirt and dust on the inner wall of the cylinder,
piston, and cup seal. Be careful not to damage the parts with a service tool when assembling.
BRA0558D
SFIA0997E
BRA0561D
BRA0561D
BRA0033D
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