Brake Shoes

The Brake System:
Brake Shoes

Brake shoes are made of malleable iron, cast steel, drop-forged steel, pressed steel, or cast aluminum. Pressed steel is usually used because it is cheaper to produce in large quantities. Steel shoes expand at approximately the same rate as the drum when heat is produced by brake application, thereby maintaining the clearance between the brake drum and the brake shoe under most conditions.

A friction lining riveted or bonded to the face of the shoe makes contact with the inner surface of the brake drum when the brake is applied. On the riveted-type lining, brass rivets are usually used because brass does not unduly score the drum when the lining is worn. Aluminum rivets are not very satisfactory because they are corroded very readily by salt water. The bonded lining is not riveted but is bonded directly to the shoe with a special cement.

Brake Shoes And Brake Linings
Differences in brake design and conditions of operation make it necessary to have various types of brake linings.
• The molded brake lining is made of dense, hard, compact materials and is cut into blocks to fit different sizes of brake shoes. Its frictional qualities are low because it has a smooth surface, but it dissipates heat rapidly and wears longer than the woven type.
• The woven brake lining is made of asbestos fiber, cotton fiber, and copper or bronze wire. After being woven, the lining is treated with compounds intended to lessen the effects of oil and water if they should come in contact with the lining. However, oil, in particular, will reduce the frictional quality of the lining even after treatment. The lining is also compressed and heat treated before being installed. The main advantage of a woven lining is its frictional qualities. However, it does not dissipate heat as rapidly or wear as well as molded brake linings. This type of lining is generally not used in automotive vehicles.

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Article Pages
1. The Brake System
2. Introduction
3. Principles Of Braking
4. Braking Requirements
5. Factors Controlling Retardation
6. External-Contracting And Internal-Expanding Brakes
7. Brake Types
8. Brake Drum Construction
9. Brake Shoes
10. Rotating And Non-Rotating Units
11. Self-Energizing Action
12. Disc Brake
13. Comparing Disc And Drum Brakes
14. Floating Caliper
15. Fixed Caliper
16. Hydraulic Brakes
17. Master Cylinder
18. Wheel Cylinder
19. Hydraulic Brake System Insepction
20. Before Road Test Inspection
21. Road Test Inspection
22. After Road Test Inspection
23. Air-Hydraulic Brake System
24. Air-Hydraulic Master Cylinder
25. Air-Hydraulic Cylinder
26. Air Compressor
27. Air Governor
28. Air-Hydraulic Brake System Components
29. Trailer Coupling Hoses And Connectors
30. Air-Over Hydraulic Cylinder
31. Operation Of Air-Hydraulic Brakes
32. Air-Hydraulic Brakes Of Large Trucks
33. Trailer Air-Over-Hydraulic Brake Systems
34. Air-Hydraulic Brake System Inspection
35. Before Road Test Inspection
36. Air-Hydraulic Brake System Road Inspection
37. Trouble Shooting Air-Hydraulic Brakes
38. Air-Brake System
39. Air-Brake Quick Release Valve
40. Air-Brake Relay Valve
41. Air-Brake Chamber
42. Air-Brake Slack Adjuster
43. Air-Brake Auxiliary Components
44. Semi-Trailer Air Brake Systems
45. Operation Of Straight Air-Brake System
46. Miscellaneous Air-Brake Components
47. Troubleshooting Straight Air Brake Systems

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