402E: Air ABS System Diagnosis Flashcards
1
Q
Before troubleshooting an ABS system what are some pre-checks to perform first?
A
- Brake adjustment
- Condition of mechanical components
- Air system operation
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2
Q
When visually checking the ABS system, what are a few things to look for?
A
- Integrity of connections
- Physical damage
- Tires of unequal size
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3
Q
Wwhat must you make sure of before disconnecting ABS electrical cables and components?
A
Power is off. To prevent damage to solid state components
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4
Q
When using a multimeter to measure a speed sensor, how fast should you turn the wheel?
A
1/2 revolution per second
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5
Q
When checking the tone ring for the cause of an ABS related fault, what should be checked before removing any components?
A
Check wheel bearing adjustment
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6
Q
What should the resistance be in the modulator valve solenoid circuit for a 12v or 24v system?
A
12V System: 4 - 8 ohms
24V System: 8 - 16 ohms
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