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What are three functions of slack adjusters used on truck air brake system?
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What do S-cam actuated brakes, air disc brakes and air-wedge actuated brakes
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Foundation Brakes

Brakes & Components

QuestionAnswer
What are three functions of slack adjusters used on truck air brake system? 1: Multiply force applied to the S-cams, 2: Define shoe to drum freeplay & 3: Convert linear force to rotational force
What do S-cam actuated brakes, air disc brakes and air-wedge actuated brakes They are used on air-brake equipped truck and trailers.
What is the most common brake drum nominal dimension used on heavy-duty trucks? 16.5"
When should you cage a spring brake chambers? 1: Before attempting to remove and replace it, 2: When making a brake adjustment and 3: Before chocking the wheels for service work.
S-cam type foundation brakes are mounted to what? Spider
There are four anchor pins used for a pair of S-cam actuated brake shoes? False! There are 2
What component rides the S-cam profiles? Shoe rollers
Define "Co-efficient of Friction"? The aggressiveness of friction surfaces. Used to grade brake friction surfaces.
Does the first letter of an edge code indicate the coefficient of friction of the friction facing when cold? Yes!
Does a closed-anchor brake shoe enclose the anchor pin it pivots on? Yes!
Where should grease be applied on an S-cam brake system components? Cam roller pocket race
What brake system has a higher mechanical braking efficiency than S-cam actuated, drum brake brakes? Air disc brakes
Air disc brakes do not offer better control than equivalent drum brakes? False!
What is the energy of motion ultimately converted to by a vehicle brake system? Heat
What is meant by 90 degrees? The angle formed between a brake chamber pushrod and the centerline of a slack adjuster when fully applied.
What is the the first step when installing open anchor brake shoes? Install the upper brake shoe.
An over-adjusting slack adjuster must be replaced? False!
Why replace the brake shoes on both ends of an affected axle? Wheel seal fails and saturates a shoe type brake.
How many types of foundation brakes are there? What are they? There are three types, and they are S-cam type (most popular), Air disc and wedge type
What was the date that ASA (Automatic Slack Adjusters) become mandatory? Oct 20, 1994
How many type of slack adjuster's are there? and what are they? Four, they are Rockwell, Gunite, Haldex and Bendix
What is the only slack adjuster that is phased? Haldex
What is the purpose of Single brake chambers? Applies service brakes only.
What are the rubber "bowls" inside the chambers called? Diaphragms
What are the chambers in dual brake chambers? Service and parking
For dual brake chambers the caging bolt is always located on the side of the chamber? False! It may be on the side or it may be internal.
What is the torque for tightening a caging bolt nut? 25 lbs. -ft; over-tightening will damage the housing
What should be done with the chamber being thrown away? Cut into four pieces to ensure spring has no energy.
What are the two ways to tell what size chamber you have? It will be stamped with the number (30 = 30 square inches), or measure widest part with ruler.
What condition would cause the brake to drag in some spots? Wheel bearings, Drum OOR (out of round)
What are the 2 types of S-cams? Flat cam and S-cam
How many types of bushings are there? and what are they? Three; They are nylon, brass and/or bronze
Does the S-cam need lubricated? Yes, regularly
Created by: clarkcummins
 

 



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