Nissan Leaf. Manual — part 293
BRAKE FLUID
BR-493
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BRAKE FLUID
Inspection
INFOID:0000000010123118
CHECK BRAKE FLUID LEVEL
• Check that the brake fluid level in the reservoir tank is within the standard (between MAX – MIN lines).
• Visually check around the reservoir tank for brake fluid leakage.
• If the brake fluid level is extremely low (below the MIN line), check the amount of brake fluid and check for
brake fluid leaks in the brake system.
• Check for dirt or other foreign material inside the reservoir tank, and check that no oil other than the desig-
nated brake fluid has entered the system.
BRAKE PIPING
1. Check for cracking and damage to brake piping (tubes and hoses). If any abnormality is found, replace
the pipe.
2. With the vehicle in READY state, depress the brake pedal with a
force of 785 N (80 kg) and hold down the pedal for approxi-
mately 5 seconds. Check for any brake fluid leakage.
CAUTION:
If brake fluid leakage has occurred, retighten all parts to the
specified torque. If any abnormalities are found, replace the
part.
Draining
INFOID:0000000010123119
CAUTION:
• Never allow brake fluid to contact the body or other painted surfaces. Brake fluid may damage paint.
If it contacts a painted surface, wipe it off immediately and wash with water. However avoid washing
brake components with water.
• Before performing work, turn the power switch OFF to exit CONSULT. Close all doors (including
back door), check that the room lamp is OFF, get out of the vehicle, and wait for 3 minutes or more
with all doors closed. Disconnect the electrically-driven intelligent brake unit, the ABS actuator con-
trol unit harness connector or disconnect the 12V battery cable from the negative terminal. Refer to
BR-6, "Precaution for Removing 12V Battery"
- Never operate the vehicle and CONSULT while waiting.
• If brake fluid contacts the disc rotor or brake caliper assembly, wipe it off immediately.
1. Connect a vinyl tube to air bleeder.
2. Depress the brake pedal and loosen the air bleeder to gradually
discharge brake fluid.
Refilling
INFOID:0000000010123120
CAUTION:
If brake fluid contacts the disc rotor or brake caliper assembly, wipe it off immediately.
1. Make sure that there is no foreign material in the reservoir tank, and refill with new brake fluid.
CAUTION:
• Never reuse drained brake fluid.
• Never allow any oils other than the designated brake fluid to enter the system.
SBR389C
BRA0007D
BR-494
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BRAKE FLUID
2. Loosen the air bleeder, slowly depress the brake pedal to the full stroke, and then release the pedal.
Repeat this operation at intervals of 2 or 3 seconds until all of the brake fluid is discharged. Then close the
air bleeder with the brake pedal depressed. Repeat the same work on each wheel.
3. Perform air bleeding.
BR-494, "Bleeding Brake System"
.
Bleeding Brake System
INFOID:0000000010123121
CAUTION:
• Turn the power switch without depressing the brake pedal when performing the procedure.
• Monitor the brake fluid level in the reservoir tank while performing the air bleeding.
• Never allow brake fluid to contact the body or other painted surfaces. Brake fluid may damage paint.
If it contacts a painted surface, wipe it off immediately and wash with water. However avoid washing
brake components with water.
• If brake fluid contacts the disc rotor or brake caliper assembly, wipe it off immediately.
1. Make sure that there is no foreign material in the reservoir tank, and refill with new brake fluid.
CAUTION:
• Never reuse drained brake fluid.
• Never allow any oils other than the designated brake fluid to enter the system.
2. Connect a vinyl tube to the rear right wheel air bleeder.
3. Fully depress the brake pedal 4 to 5 times.
4. Loosen the air bleeder and bleed air with the brake pedal depressed, then quickly tighten the bleeder
valve.
5. Repeat steps 2 to 3 until all of the air is out of the brake line.
6. Tighten the air bleeder to the specified torque.
• Front disc brake: Refer to
BR-518, "BRAKE CALIPER ASSEMBLY : Exploded View"
• Rear disc brake: Refer to
BR-525, "BRAKE CALIPER ASSEMBLY : Exploded View"
.
7. Perform steps 2 to 6. Occasionally fill with the brake fluid in order to keep it in the reservoir tank to at least
half of the MAX line. Bleed air in the following order: rear right brake
→ front left brake → rear left brake →
front right brake.
8. Check that the brake fluid level in the reservoir tank is within the specified range after air bleeding.
9. Check the brake pedal items, and adjust if any are not within the standard values. Refer to
.
ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT
BR-495
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ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT
Inspection
INFOID:0000000010123122
Brake fluid leakage
Check for brake fluid leakage from the brake tube connections and the electrically-driven intelligent brake unit.
BR-496
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FRONT DISC BRAKE
FRONT DISC BRAKE
BRAKE PAD
BRAKE PAD : Inspection and Adjustment
INFOID:0000000010123123
Brake pad wear inspection
Check the brake pad thickness from the inspection hole in the cylin-
der body. Use a scale to check if necessary.
ADJUSTMENT
If the brake pad is ground or replaced, or if there is an abnormal feel to the braking force, follow the procedure
below and perform break-in work.
CAUTION:
• Because the brake effectiveness is reduced, pay sufficient attention to the vehicle speed.
• Perform checks on a safe road and be careful of the traffic conditions.
1. Drive on straight and flat roads.
2. Stop the vehicle by depressing the brake pedal to generate braking force that stops the vehicle in 3 to 5
seconds.
3. Cool the brakes.
4. Repeat steps 1 to 3 until the abnormal feel in braking force disappears.
DISC ROTOR
DISC ROTOR : Inspection and Adjustment
INFOID:0000000010123124
Visual inspection
Check surface of the disc rotor for uneven wear, cracks, and serious damage. Replace if necessary. Refer to
FAX-9, "Removal and Installation"
.
RUNOUT INSPECTION
1. Use the wheel nuts and fasten the disc rotor to the wheel hub assembly (minimum 2 positions).
2. Check axial end play of wheel hub assembly.
3. Check runout using a dial indicator [at 10 mm (0.39 in) from
outer edge of disc rotor].
4. If runout is outside the specified value, find the minimum runout
point by shifting mounting positions of the disc rotor and wheel
hub by one hole.
5. If runout is outside the specified value after performing the
above operation, refinish disc rotor using Tool.
CAUTION:
• Perform grinding of disc rotor if disc rotor thickness is 0.3 mm (0.012 in) or more above the wear
limit thickness.
• Replace disc rotor if disc rotor thickness is less than 0.3 mm (0.012 in) above the wear limit
thickness. Refer to
FAX-9, "Removal and Installation"
.
Wear limit
thickness
: Refer to
MAA0439D
Maximum runout
(vehicle stopped)
: Refer to
SBR019B
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