BRAKE ACTUATOR INSPECTION
PROCEDURE
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CHECK BRAKE ACTUATOR ASSEMBLY
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for LHD:
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Measure the resistance according to the value(s) in the table below.
Text in Illustration *a Component without harness connected
(Brake Actuator Assembly)
- - Tech Tips
Check the brake actuator assembly when it is cooled down.
Standard Resistance Tester Connection Condition Specified Condition 20 (SMC1) - 19 (BS1) Always 15.3 to 25.0 Ω 20 (SMC1) - Body ground Always 10 kΩ or higher 6 (SMC2) - 7 (BS2) Always 15.3 to 25.0 Ω 6 (SMC2) - Body ground Always 10 kΩ or higher 8 (FRA+) - 5 (FRA-) Always 3.6 to 6.0 Ω 8 (FRA+) - Body ground Always 10 kΩ or higher 22 (FRR+) - 21 (FRR-) Always 3.6 to 6.0 Ω 22 (FRR+) - Body ground Always 10 kΩ or higher 13 (FLA+) - 14 (FLA-) Always 3.6 to 6.0 Ω 13 (FLA+) - Body ground Always 10 kΩ or higher 27 (FLR+) - 28 (FLR-) Always 3.6 to 6.0 Ω 27 (FLR+) - Body ground Always 10 kΩ or higher 12 (RRA+) - 11 (RRA-) Always 3.6 to 6.0 Ω 12 (RRA+) - Body ground Always 10 kΩ or higher 10 (RLA+) - 9 (RLA-) Always 3.6 to 6.0 Ω 10 (RLA+) - Body ground Always 10 kΩ or higher 26 (RRR+) - 25 (RRR-) Always 4.4 to 7.0 Ω 26 (RRR+) - Body ground Always 10 kΩ or higher 24 (RLR+) - 23 (RLR-) Always 4.4 to 7.0 Ω 24 (RLR+) - Body ground Always 10 kΩ or higher If the result is not as specified, replace the brake actuator.
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for RHD:
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Measure the resistance according to the value(s) in the table below.
Text in Illustration *a Component without harness connected
(Brake Actuator Assembly)
- - Tech Tips
Check the brake actuator assembly when it is cooled down.
Standard Resistance Tester Connection Condition Specified Condition 37 (SMC1) - 36 (BS1) Always 15.3 to 25.0 Ω 37 (SMC1) - Body ground Always 10 kΩ or higher 19 (SMC2) - 20 (BS2) Always 15.3 to 25.0 Ω 19 (SMC2) - Body ground Always 10 kΩ or higher 44 (FRA+) - 43 (FRA-) Always 3.6 to 6.0 Ω 44 (FRA+) - Body ground Always 10 kΩ or higher 28 (FRR+) - 27 (FRR-) Always 3.6 to 6.0 Ω 28 (FRR+) - Body ground Always 10 kΩ or higher 35 (FLA+) - 38 (FLA-) Always 3.6 to 6.0 Ω 35 (FLA+) - Body ground Always 10 kΩ or higher 21 (FLR+) - 22 (FLR-) Always 3.6 to 6.0 Ω 21 (FLR+) - Body ground Always 10 kΩ or higher 39 (RRA+) - 40 (RRA-) Always 3.6 to 6.0 Ω 39 (RRA+) - Body ground Always 10 kΩ or higher 41 (RLA+) - 42 (RLA-) Always 3.6 to 6.0 Ω 41 (RLA+) - Body ground Always 10 kΩ or higher 23 (RRR+) - 24 (RRR-) Always 4.4 to 7.0 Ω 23 (RRR+) - Body ground Always 10 kΩ or higher 25 (RLR+) - 26 (RLR-) Always 4.4 to 7.0 Ω 25 (RLR+) - Body ground Always 10 kΩ or higher If the result is not as specified, replace the brake actuator.
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CHECK BRAKE ACCUMULATOR PUMP
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for LHD:
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Text in Illustration *a Component without harness connected:
(Brake Accumulator Pump)
Measure the resistance according to the value(s) in the table below.
Standard resistance Tester Connection Condition Specified Condition 2 (BM1) - 31 (GND1) Always Below 1 Ω 2 (BM1) - 32 (GND2) Always Below 1 Ω 1 (BM2) - 31 (GND1) Always Below 1 Ω 1 (BM2) - 32 (GND2) Always Below 1 Ω 2 (BM1) - 33 (MTT) Always 450 to 550 Ω 1 (BM2) - 33 (MTT) Always 450 to 550 Ω If the result is not as specified, replace the brake accumulator pump.
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for RHD:
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Text in Illustration *a Component without harness connected:
(Brake Accumulator Pump)
Measure the resistance according to the value(s) in the table below.
Standard resistance Tester Connection Condition Specified Condition 31 (BM1) - 1 (GND1) Always Below 1 Ω 31 (BM1) - 2 (GND2) Always Below 1 Ω 32 (BM2) - 1 (GND1) Always Below 1 Ω 32 (BM2) - 2 (GND2) Always Below 1 Ω 31 (BM1) - 3 (MTT) Always 450 to 550 Ω 32 (BM2) - 3 (MTT) Always 450 to 550 Ω If the result is not as specified, replace the brake accumulator pump.
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