Vehicle Maintenance and Repair Flashcards

A fleet vehicle's brake pedal feels spongy and sinks to the floor under moderate pressure. What is the most likely cause?

Answer: Air in the brake hydraulic system

Air in the hydraulic brake lines compresses under pressure, causing a spongy pedal feel and reduced braking effectiveness.

When implementing a preventive maintenance schedule for a mixed fleet, which interval system is generally preferred over fixed mileage intervals?

Answer: Severity-adjusted intervals

Severity-adjusted intervals account for actual operating conditions (stop-and-go, idling, towing) which affect component wear more accurately than fixed mileage alone.

A fleet manager notices repeated alternator failures on a specific vehicle model. What is the BEST first step in diagnosing this systemic issue?

Answer: Review repair history and identify common failure modes

Reviewing repair history to identify common failure modes helps pinpoint root causes such as accessory loads, wiring issues, or a faulty OEM part batch.

What does the acronym 'OBD-II' refer to in fleet vehicle diagnostics?

Answer: On-Board Diagnostics, second generation

OBD-II is the standardized on-board diagnostics system mandatory on US vehicles since 1996, providing fault codes and sensor data via a standard port.

A fleet vehicle is due for a timing belt replacement per manufacturer schedule. The technician finds the belt in apparently good condition. What should the fleet manager authorize?

Answer: Replace it on schedule regardless of appearance

Timing belt failures are catastrophic and often occur without visible warning signs; replacement on schedule is standard fleet risk management practice.

Which type of engine oil viscosity rating is most critical for fleet vehicles operating in regions with extreme temperature swings?

Answer: Multi-grade oil (e.g., SAE 5W-30)

Multi-grade oils maintain proper viscosity across a wide temperature range, ensuring adequate lubrication during cold starts and high-temperature operation.

A fleet technician reports that a vehicle's coolant is milky or frothy in appearance. What does this most likely indicate?

Answer: Head gasket failure allowing oil-coolant mixing

Milky or frothy coolant is a classic sign of head gasket failure, where combustion gases or oil enters the cooling system.

Under the FMCSA regulations, Class 8 commercial trucks must have their brake adjustment inspected at minimum how frequently during a roadside inspection?

Answer: At every roadside inspection as part of the inspection process

FMCSA roadside inspections include brake adjustment checks as a standard component; out-of-adjustment brakes are a primary cause of out-of-service violations.

What is the primary purpose of a vehicle's differential in a fleet truck?

Answer: To allow drive wheels to rotate at different speeds during turns

The differential allows the outer drive wheel to rotate faster than the inner wheel during cornering, preventing tire scrub and drivetrain stress.

A fleet manager wants to extend tire life across the fleet. Which maintenance practice has the single greatest impact on tire longevity?

Answer: Maintaining proper tire inflation pressure

Proper inflation pressure is the most impactful factor in tire life; underinflation causes excessive heat and sidewall flex that accelerates wear and risk of failure.

When a fleet vehicle requires a wheel alignment, which measurement describes the inward or outward tilt of the tire at the top when viewed from the front?

Answer: Camber

Camber is the vertical tilt of the wheel; positive camber tilts the top outward, negative tilts it inward, and incorrect camber causes uneven tire wear.

A fleet manager receives a TSB (Technical Service Bulletin) from a vehicle OEM. What action is required?

Answer: Review and determine if the issue applies to fleet vehicles, then decide on action

TSBs are informational, not mandatory recalls; fleet managers should review them, identify affected units, and decide whether to implement the fix based on applicability.

What is the recommended action when a fleet vehicle's automatic transmission fluid appears dark brown or has a burnt odor?

Answer: Perform a transmission flush and fluid replacement

Dark, burnt-smelling ATF indicates oxidation and thermal breakdown; a flush and fluid replacement should be performed to prevent premature transmission failure.

In fleet maintenance, what does 'VMRS' stand for and what is its primary use?

Answer: Vehicle Maintenance Reporting Standards; standardizes maintenance cost and repair data coding

VMRS (Vehicle Maintenance Reporting Standards) is an ATA-developed coding system that standardizes how maintenance and repair data is recorded, enabling cost analysis and benchmarking.

A fleet vehicle's engine oil analysis report shows elevated silicon levels. What does this most likely indicate?

Answer: Dirt/dust ingestion from a compromised air filtration system

Elevated silicon in oil analysis is a primary indicator of dirt ingestion, commonly caused by a damaged or improperly seated air filter.

What is the function of a diesel particulate filter (DPF) in a fleet diesel vehicle, and what maintenance does it require?

Answer: Captures soot from exhaust; requires periodic regeneration or cleaning

The DPF captures particulate matter from diesel exhaust and requires regeneration (burning off trapped soot) or periodic forced cleaning to prevent plugging.

A fleet manager is evaluating whether to repair or replace a vehicle with 180,000 miles that needs a $4,500 engine repair. The vehicle's market value is $6,000. Which framework is most appropriate for this decision?

Answer: Replace if repair cost exceeds 50% of vehicle market value

The common fleet industry rule is to replace a vehicle when a single repair exceeds 50% of the vehicle's current market value, as ongoing repair costs typically escalate.

Which of the following best describes 'predictive maintenance' in a fleet context?

Answer: Using condition monitoring data to predict and prevent failures before they occur

Predictive maintenance uses telematics, oil analysis, and sensor data to identify deteriorating conditions and schedule repairs before a failure occurs.

A fleet vehicle experiences repeated electrical shorts in the same circuit. After replacing the fuse multiple times, what is the appropriate next diagnostic step?

Answer: Trace the circuit wiring for chafing, damage, or improper grounding

Repeated fuse failures indicate an underlying short circuit; the wiring must be physically traced to find damaged insulation, pinched wires, or poor ground connections.

What is the purpose of a 'fleet maintenance benchmarking' program?

Answer: To compare fleet maintenance costs and performance metrics against industry peers

Benchmarking compares a fleet's cost per mile, downtime rates, and PM compliance against industry averages or peer fleets to identify improvement opportunities.