MOUNTING GP 5172598 - Caterpillar

Introduction
Location of Components
(1) Master cylinder. (2) Service brake pedal. (3) Parking brake lever. (4) Parking brake. (5) Service brakes. (6) Brake drums.The machine has two separate braking systems. The service brake is used to stop the machine during normal operation. The parking brake is used to hold a stopped or parked machine in place. The parking brake may also be used to stop the machine if the service brake fails to operate. Both braking systems have been designed and tested to be in accordance with SAE J1136 braking recommendations.The service brake is hydraulically-operated using brake pedal (2). When the operator steps on the brake pedal, master cylinder (1) sends brake fluid to service brakes (5). There are four service brakes (5) and four rotating brake drums (6). These components are located on the rear drive wheels of the machine. Service brakes (5) apply braking force to brake drums (6), stopping the machine or holding it in position.Parking brake (4) is part of the machine's power train. The parking brake drum is bolted to the transmission output flange. Lever (3) is mechanically connected to parking brake (4). When the operator pulls back on the lever, the parking brake is applied. When the operator pushes the lever down, the parking brake is released.Brake Pedal
Brake Pedal
(1) Pivot bolt. (2) Clevis. (3) Push rod. (4) Spring. (5) Pedal.The operator applies the service brake by pressing pedal (5). One end of push rod (3) is connected to the pedal through clevis (2). The other end of push rod (3) contacts the master cylinder piston.When the operator presses on the pedal, the pedal pivots on bolt (1). This causes push rod (3) to move to the right. Movement of the push rod actuates the master cylinder piston.When the operator releases pedal (5), spring (4) moves the pedal and the push rod back to their original positions.Master Cylinder
Master Cylinder
(1) Cup. (2) Piston. (3) Reservoir. (4) Passage. (5) Cup. (6) Relief valve. (7) Check valve. (8) Port. (9) Spring. (10) Chamber. (11) Passages. (12) Piston. (13) Passage. (14) Spring. (15) Chamber. (16) Seat.The master cylinder changes brake pedal force into hydraulic pressure. The master cylinder sends this hydraulic pressure to the service brakes to stop the machine.The free end of the push rod (part of the brake pedal assembly) fits inside cup (1) at the left end of piston (2). The push rod is covered by a rubber boot to prevent dirt from entering the master cylinder.Reservoir (3) and chambers (10) and (15) are filled with brake fluid all the time. When the operator presses on the brake pedal, the push rod moves piston (2) to the right. Piston (2) moves past passage (4), sealing off chambers (10) and (15) from reservoir (3).Movement of piston (2) compresses springs (9) and (14). This causes piston (12) to move to the right, sealing against seat (16). As piston (2) moves further, pressure builds up in chamber (15). Fluid from chamber (15) moves through passages (11) and past the