Infiniti F50. Manual - part 260

 

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Infiniti F50. Manual - part 260

 

 

BRAKE BOOSTER

BR-21

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BR

BRAKE BOOSTER

PFP:47200

On-Vehicle Service

EFS0020X

OPERATING CHECK

With the engine stopped, change the vacuum to the atmospheric
pressure by depressing the brake pedal several times. Then with
brake pedal fully depressed, start the engine and when the vacuum
pressure reaches the standard, check that the clearance between
the brake pedal and floor panel decreases.

CAUTION:

Depressing pedal interval is approximately 5 seconds.

AIRTIGHT CHECK

Run the engine at idle for approximately 1 minute, and stop it
after applying vacuum to the booster. Depress the brake pedal
normally to change the vacuum to the atmospheric pressure.
Check that distance between the brake pedal and floor panel
gradually increases.

CAUTION:

Depressing pedal interval is approximately 5 seconds.

Removal and Installation 

EFS0020Y

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 the vacuum hose from the brake booster.

2.

Remove the master cylinder.

3.

Remove the snap pin and clevis pin on the clevis in the passen-
ger compartment, and remove the input rod from the brake
pedal.

4.

Remove the mounting nuts on the pedal bracket.

5.

Remove the booster assembly from the engine compartment.

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 the brake booster.

2.

Check output rod length.

BRA0037D

SBR365AA

SFIA0852E

Standard dimension when vacuum
 –66.7 kPa (–500 mmHg, –19.69 inHg):

                      With VDC:

– 6.2 mm (– 0.24 in)

                     With ICC:

 10.4 mm (0.409 in)

SBR208E

BR-22

BRAKE BOOSTER

INSTALLATION

1.

Loosen the lock nut to adjust the 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 the vehicle. At this time, make sure to
install a gasket between the booster assembly and the vehicle.

3.

Connect the brake pedal with the clevis of the input rod.

4.

Install the pedal bracket mounting nuts and tighten them to the
specified torque.

5.

Install the master cylinder to the booster assembly.

6.

Adjust the height and play of the brake pedal.

7.

Tighten the lock nut of the input rod to the specified torque.

8.

Bleed air.

Length “B”

: 125 mm (4.92 in)

SGIA0060E

FRONT DISC BRAKE

BR-23

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FRONT DISC BRAKE

PFP:41000

Components 

EFS000G8

CAUTION:

Clean dust on caliper and brake pad with a vacuum dust collector. Do not blow with compressed
air.

While removing cylinder body, never depress brake pedal because piston will pop out.

It is not necessary to remove mounting bolts on torque member and brake hose except for disas-
sembly 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 shims and shim covers as a set when replacing brake pads.

Keep brake fluid clean of rotor.

1.

Sliding pin

2.

Sliding pin boot

3.

Washer

4.

Torque member

5.

Inner shim cover

6.

inner shim

7.

Inner pad

8.

Pad retainer

9.

Outer pad

10. Outer shim

11.

Outer shim cover

12. Union bolt

13. Copper washer

14. Bleed valve

15. Cylinder body

16. Piston seal

17. Piston

18. Piston boot

19. Sliding pin bolt

20. Torque member bolt

SFIA0998E

BR-24

FRONT DISC BRAKE

Inspection 

EFS000G9

PAD WEAR INSPECTION 

Remove wheel with vehicle lifted to check pad thickness from
check hole on cylinder body. If necessary, use a scale to check.

Pad Replacement

EFS000GA

REMOVAL 

WARNING:

Clean brake pads with a vacuum dust collector to minimize the hazard of airborne particles or other
materials.

CAUTION:

When cylinder body is open, do not depress brake pedal because piston will pop out. 

Be careful not to damage piston boot or get oil on rotor always replace shims in replacing pads.

It shims are rusted or show peeling of rubber coat, replace them with new shims.

it is not necessary to remove connecting bolt except for disassembly or replacement 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-29, "Brake Burnishing Proce-

dure"

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1.

Remove master cylinder reservoir cap.

2.

Remove lower sliding pin bolt.

Standard thickness 

: 10.0 mm (0.394 in)

Repair limit thickness 

: 2.0 mm (0.079 in)

MAA0439D

SBR433D

 

 

 

 

 

 

 

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