Testing Part 1
HYDRAULIC BRAKE BOOSTERON-VEHICLE INSPECTION
PART 1
1. CHECK HYDRAULIC BRAKE BOOSTER FLUID PRESSURE CHANGE
a. Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
b. Turn the ignition switch OFF, depress the brake pedal more than 40 times.
HINT: When a pressure in power supply system is released, reaction force becomes light and stroke becomes longer.
c. Install LSPV gauge (SST and brake pedal effort gauge, bleed air.
SST 09709-29018
d. When booster does not operate:
Depress the brake pedal and check fluid pressure.
At 245 N (25 kgf, 55 lbs.)
At 343 N (35 kgf, 77 lbs.)
e. w/ ABS only, when booster operate:
1. Turn the ignition switch ON and wait until the pump motor has stopped.
2. Depress the brake pedal and check fluid pressure.
At 49 N (5 kgf, 11 lbs.)
At 98 N (10 kgf, 22 lbs.)
At 147 N (115 kgf, 33 lbs.)
At 196 N (20 kgf, 44 lbs.)
f. w/ ABS & TRAC & VSC ECU only, when booster operate:
1. Turn the ignition switch ON and wait until the pump motor has stopped.
2. Depress the brake pedal and check fluid pressure.
At 49 N (5 kgf, 11 lbs.)
At 98 N (10 kgf, 22 lbs.)
At 147 N (15 kgf, 33 lbs.)
At 196 N (20 kgf, 44 lbs.)
2. w/ ABS only,
In case of using TOYOTA hand-held tester:
INSPECT HYDRAULIC BRAKE BOOSTER OPERATION
a. Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
b. Turn the ignition switch OFF, depress the brake pedal more than 40 times.
HINT: When a pressure in power supply system is released, reaction force becomes light and stroke becomes longer.
c. Turn the ignition switch ON, check the pump motor operation noise. If the pump motor does not operate, check and replace the wire harness and pump motor.
d. Connect the TOYOTA hand-held tester.
1. Connect the TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Select the "ACTIVE TEST" mode on the TOYOTA hand-held tester.
HINT:
^ Please refer to the TOYOTA hand-held tester operator's manual for further details.
^ To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON.
e. Inspect the front ABS switching solenoid operation.
1. Select "SA1 " and "SA2" on the TOYOTA hand-held tester.
2. With "SA1 and "SA2" turned ON simultaneously with the TOYOTA hand-held tester, depress the brake pedal with stable force and check that the pedal cannot be depressed.
HINT: To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON. If the pedal can be depressed, replace the hydraulic brake booster.
NOTICE: When operating it continuously, set the interval of more than 20 sec.
3. Once, release the brake pedal.
4. When the solenoids are OFF, after depressing the brake pedal again and check that the brake pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake booster.
f. Inspect the front ABS solenoid operation.
1. Select "SFRH" and "SFLH" on the TOYOTA handheld tester.
2. With "SFRH" and "SFLH" turned ON simultaneously with the TOYOTA hand-held tester, depress the brake pedal with stable force and check that the brake pedal cannot be depressed.
HINT: To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON. If the pedal can be depressed, replace the hydraulic brake booster.
3. Once, release the brake pedal when the solenoids are OFF, check that the brake pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake booster.
4. Once, release the brake pedal. After depressing and holding the brake pedal with stable force, turn the SFRH and SFRR solenoids ON simultaneously.
HINT: To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON.
5. When the solenoids are OFF, check that the brake pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake booster.
6. Once, release the brake pedal. After depressing and holding the brake pedal with stable force, turn the SFLH and SFLR solenoids ON simultaneously.
HINT: To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON.
7. Once release the brake pedal when the solenoids are OFF, check that the brake pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake booster.
g. Jack up and support the vehicle.
h. Release the parking brake lever.
i. Inspect the rear ABS solenoid.
1. Select the "SRH" on the TOYOTA hand-held tester.
2. Turn the "SRH" ON with the TOYOTA hand-held tester and depress the brake pedal with stable force, and rotate the right rear wheel by hand and check it.
HINT:
^ To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON.
^ When rotating the wheel fast, the fail-safe function is activated and judgment cannot be made properly. So rotate the wheel as slowly as possible.
^ When solenoid is OFF, the wheel might stop temporarily. However if the wheel rotates again, the function works normally. If the rear wheels stop, replace the hydraulic brake booster.
3. Once, release the brake pedal and turn the "SRH" OFF, after depressing the brake pedal with stable force and stop the rear right wheel by hand and check it.
If the rear wheel rotate, replace the hydraulic brake booster.
4. Depress the pedal with stable force, then turn the "SRH" and "SRR" ON simultaneously.
5. When the solenoids are ON, rotate the rear wheel by hand and check it.
HINT:
^ To protect the solenoids, TOYOTA hand-held tester turns OFF automatically for 2 sec. after every solenoid has been turned ON.
^ When rotating the wheel fast, the fail-safe function is activated and judgment cannot be made properly. So rotate the wheel as slowly as possible.
j. Lower the vehicle.
k. Disconnect the TOYOTA hand-held tester.
3. w/ABS & TRAC & VSC only,
In case of using TOYOTA hand-held tester:
INSPECT HYDRAULIC BRAKE BOOSTER OPERATION
a. Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
b. Turn the ignition switch OFF, depress the brake pedal more that 40 times.
HINT: When a pressure in power supply system is released, reaction force becomes light and stroke becomes longer.
c. Check that the brake pedal becomes light to depress. If the pedal does not become to be light to depress, check and replace the brake line and hydraulic brake booster.
d. Turn the ignition switch ON, check the pump motor operation noise.
If the pump motor does not operate, check and replace the wire harness and pump motor.