Red Seal Truck & Transport Mechanic (310T)
Official Timed Mock Exam Simulator

Worked Explanation: While wheel chocks, closed doors, and vehicle parking safeguards are important for initial vehicle preparation, the most critical safety step *after* raising a vehicle on a hydraulic lift is to ensure the hoist's primary safety locks are engaged and then to place secondary support stands (jack stands) under the vehicle's frame. This provides redundant support, protecting the mechanic in case of hydraulic failure or primary lock malfunction, which is a fundamental requirement for working under lifted equipment. Redundant safety systems are paramount.

Worked Explanation: According to CVSA North American Standard Out-of-Service Criteria: 1. A vehicle is out-of-service if any brake on a steering axle of a truck, truck tractor, or bus is defective. The right front steer axle brake is defective (Type 20 max stroke is 50mm, measured 58mm). This alone makes the vehicle out-of-service. 2. A vehicle is out-of-service if 20% or more of its service brakes are defective. There are 3 defective brakes out of a total of 10 (30%), which exceeds the 20% threshold. Therefore, both criteria (defective steering axle brake and more than 20% defective brakes) are met, making the vehicle out-of-service for multiple reasons.

Worked Explanation: According to CVSA (Commercial Vehicle Safety Alliance) out-of-service criteria, a main leaf spring that is broken, cracked, or missing is an immediate out-of-service condition. A crack extending more than halfway across the width of any leaf (other than the main leaf) is also an out-of-service condition. A crack of this severity in the main leaf poses a significant safety risk, necessitating immediate repair before further operation.