Prius L4-1.5L (1NZ-FXE) (Hybrid) (2003)
Brake Bleeding: Service and Repair
BLEEDING
HINT:
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If any work is done on the brake system or if air in the brake lines is suspected, bleed the air from the system.
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When bleeding, keep the amount of the fluid within the line of reservoir between Min. and Max.
NOTICE:
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Do not let brake fluid remain on painted surfaces. Wash it off immediately.
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With the reservoir cap removed, when depressing the brake pedal, the fluid will spray.
1. FILL RESERVOIR WITH BRAKE FLUID
Fluid: SAE J1703 or FMVSS NO. 116 DOT3
2. RELEASE PRESSURE FROM POWER SUPPLY SYSTEM
HINT: If the hydraulic brake booster has been disassembled, disconnect the brake line from the hydraulic brake booster or if the reservoir
becomes empty, bleed the hydraulic brake booster.
a. Turn the ignition switch OFF, depress the brake pedal more than 40 times.
b. Turn the ignition switch ON, check that the pump stops after 30 to 40 seconds.
NOTICE: When the pump does not stop, repeat step (a) and (b) again.
3. BLEED AIR
a. Turning the ignition switch OFF, bleed the right and left front brake caliper.
HINT: Perform air bleeding for each wheel, depress the brake pedal more than 20 times or more for each.
b. Turning the ignition switch ON, check that the pump motor stops.
c. Fully open the bleeder plug of the right or left rear brake cylinder and drain the fluid while depressing the brake pedal for 3 seconds.
HINT:
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Perform air bleeding for both wheels on the right or left side and then do the same on the other side.
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It is not necessary to depress the pedal continuously, as brake fluid flows out by first depressing.
d. Release the brake pedal and wait until the pump motor stops.
e. Repeat step (c) and (d) 7 times or more.
f.
Tighten the bleeder plug of the rear brake cylinder.
Torque: 8.5 Nm (87 kgf-cm, 75 inch lbs.)
g. While depressing the brake pedal, let air out from the rear brake cylinder mentioned in (f).
HINT:
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Hold the brake pedal depressed, and it is not necessary to repeat depressing of the pedal.
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Do not continuously drain the fluid from the bleeder plug for more than 3 seconds.
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When closing the bleeder plug, wait until the pump motor stops if it is operated.
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Repeat the procedure until air is completely removed.
h. Perform step (c) to (g) on the other rear brake cylinder.
i.
With the ignition switch ON, check that the pump motor is stopped.
j.
Fully the bleeder plug of the front left brake cylinder and drain the fluid while depressing the brake pedal for 3 seconds.
k. Release the brake pedal and wait until the pump motor stops.
l.
Repeat step (j) and (k) 4 times.
m. Tighten the bleeder plug of the front left brake cylinder.
Torque: 8.5 Nm (87 kgf-cm, 75 inch lbs.)
n. While depressing the brake pedal, let air out from the front left brake cylinder.
HINT:
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Hold the brake pedal depressed, and it is not necessary to repeat depressing of the pedal.
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Do not continuously drain the fluid from the bleeder plug for more than 3 seconds.
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When closing the bleeder plug, wait until the pump motor stops if it is operated.
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Repeat the procedure until air is completely removed.
o. Check that the pump motor is stopped.