Combination Endorsement Practice Test 2026 - Free Combination Endorsement Practice Questions and Study Guide

The correct angle for pressing the seals together when connecting the glad hands is 90 degrees. This angle allows for an effective and secure seal between the two glad hands, which is essential for maintaining the air pressure in the braking system of a combination vehicle. A 90-degree connection ensures that the seals align properly and prevent air leaks, which could lead to malfunctioning brakes or inadequate trailer brake performance.

Using angles that are too acute or too obtuse, such as 45 degrees, 120 degrees, or 180 degrees, may compromise the integrity of the connection. These positions can lead to misalignment or insufficient contact between the seals, ultimately affecting the operation of the braking system and the overall safety of the vehicle while in operation.