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Foundation Brakes
Brakes & Components
| Question | Answer |
|---|---|
| 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