Fixed Caliper

The Brake System:

Fixed Caliper

The fixed caliper is mounted rigidly to the spindle or splash shield. In this design, the caliper usually is made in two pieces and has either two, three, or four pistons in use. The pistons, which may be made of cast iron, aluminum, or plastic, are provided with seals and dust boots and fit snugly in bores machined in the caliper. The centering action of the fixed caliper is accomplished by the pistons as they move in their bores.

If the lining should wear unevenly on one side of the caliper, the excess clearance would be taken up by the piston simply by moving further out in its bore. As the brakes are applied, the fluid pressure enters the caliper on one side and is routed to the other through an internal passageway or an external tube connected to the opposite half of the caliper. As pressure is increased, the pistons force the brake pads against the rotors evenly and therefore maintain an equal amount of pressure on both sides of the rotor.

As discussed above, the fixed calipers use a multi-piston design to provide the braking force. The fixed calipers may be designed to use two, three, or four pistons.

The dual-piston design provides a slight margin of safety over a single-piston floating caliper.

In the event of a piston seizing in the caliper, the single-piston caliper would be rendered useless, while the dual-piston design would still have one working piston to restore some braking ability. The three- and four-piston design provides for the use of a large brake lining. The brake force developed may now be spread over a larger area of the brake pad.

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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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