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Where should you park your vehicle to check the free play of manual slack adjusters on S-CAM brakes?



A. On level ground with a parking brake, then apply the service brake
B. Park on a level ground, chalk the wheels and turn off the parking brakes
C. Park on level ground and drain off air pressure before adjusting
D. Park on a slight grade, release the parking brake, apply the service brake and check for vehicle movement

This question is part of Passenger Bus Test
Asked by Ncopp, Last updated: Sep 24, 2020

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2 Answers

Christian Jackson

Christian Jackson

Christian Jackson
Christian Jackson, Content Developer, Austin

Answered Feb 11, 2019

The S-CAM brakes are those that are usually used on vehicles that weigh more than the standard car. These bigger vehicles would be tractor trailer trucks. The shoes of the brakes have an S shape which is why they are called what they are. Air pressure is the main way to make the air brakes function.

These air brakes must be adjusted manually. That means that they must be done by the driver and it can’t be done by pushing a button in the cab. It is important for the driver to park their vehicle in a secure place to check the free play of manual slack adjusters on their S-CAM brakes. The best place to park would be on level ground, chalk the wheels and turn off the parking brakes.

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John Smith

John Smith

John Smith
John Smith

Answered Apr 26, 2017

Park on a level ground, chalk the wheels and turn off the parking brakes
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