After Road Test Inspection

The Brake System:

After Road Test Inspection

If such things as pulling to one side or poor braking action are noted during a road test, an after road-test inspection is done.

Many faults occur in the brake system that can cause the vehicle to pull to one side. However, all these faults have one thing in common: they affect the brake in one wheel causing that wheel to hold either more or less than the other wheels. If the affected wheel holds more, the vehicle will pull toward the affected wheel; if it holds less, the vehicle pulls away from the affected wheel.

The most common faults that cause the brakes to hold unevenly are unequal brake adjustment, grease or brake fluid on the lining, dirt in the brake drum, brake drum or rotor scored or rough, different kinds of brake linings on opposite wheels, primary and secondary brake shoes reversed in one wheel (on some vehicles), glazed or worn lining, restricted brake line, weak brake shoe return springs, or sticking pistons in a wheel or caliper cylinder.

Image Right: Oil & dirt on brake shoes or pads reduce stopping efficiency

If the inspection indicates that the wheel brakes are at fault, you must determine the condition of the brake parts in the wheel brakes. Do this by removing one wheel and brake drum from each axle assembly and inspecting the brake parts in these wheels. It is reasonable to assume that the condition of both brake assemblies on one axle will be about the same. Inspect the condition of the brake drum, brake lining, brake shoe anchor, hold-down springs, retracting (return) springs, brake shoe adjusting mechanism, and wheel cylinder.

Image Right: Worn brake shoes should be replaced

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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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