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Difficulty: MediumBrake System Components Inspection

Friction linings or brake pads found contaminated with oil, grease, or hub lubricant during an inspection are considered safe for operation provided that the remaining lining thickness exceeds 14 inch\frac{1}{4}\text{ inch}.

Answer: Answer

Answer

False
The statement is false because any grease, oil, or brake fluid contamination on brake shoes, pads, drums, or rotors is a critical safety defect that requires immediate repair or replacement, regardless of how much friction material remains.

Step-by-Step Solution

1
Analyze the component condition and the proposed exception in the statement.
The statement claims that adequate lining thickness (greater than 14 inch\frac{1}{4}\text{ inch}) overrides the hazard of lubricant contamination on friction surfaces.
Commercial vehicle foundation brake inspection standards establish specific, non-negotiable safety criteria for both physical wear and surface contamination.
2
Evaluate standard commercial motor vehicle safety criteria regarding contaminated friction material.
Any evidence of grease, oil, or hub seal leakage on brake linings or drums renders the component defective and out of service.
Lubricants dramatically reduce friction coefficient, cause severe brake imbalance, increase stopping distance, and create a fire hazard under heavy braking.
3
Determine the validity of the overall statement.
The statement is false because adequate thickness does not compensate for compromised friction integrity.
Both conditions—sufficient thickness and clean, uncontaminated friction surfaces—must be satisfied for the foundation brakes to pass inspection.

Key Concept

Brake friction lining contamination defect criteria
Estimated Time:1m 0s
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Topics

Brake System Components Inspection

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