SHOE 7S9104 - Caterpillar

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Oil Groove Depth of the Brake DiscsThe oil groove depth is the most critical dimension. If the depth of the oil grooves on the brake disc is too shallow, oil flow will be inadequate. This can cause excessive wear and abrasion.An indicator pin is located on each side of the front and rear axle center housings.
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End View of Axle Housing for the Service Brakes
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View A-A
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Detail B (1) Piston. (2) Friction disc. (3) Pin. (4) Plug. (5) Screw. (6) Cup.Dimension (A) equals the distance from the flange face of the axle housing to the end of pin (3). The value of dimension (A) can be used to determine the amount of service life that is available for the service brake disc. The baseline values for dimension (A) of the four service brakes were originally measured at the factory when the machine was new. The baseline values for dimension (A) are stored electronically on the machine's transmission electronic control module (ECM). Use the Caterpillar Electronic Technician (ET) in order to retrieve the baseline value of dimension (A). Subtract the value of dimension (A) from the baseline value. The difference indicates the amount of wear that has occurred to the service brake disc.Note: When a new brake disc is installed, the baseline value for that service brake must be changed.Reference: For more information about determining a new baseline value, refer to Testing and Adjusting, "Service Brake Wear Indicator (New Brake Disc) - Check" for the machine that is being serviced.Reference: For additional information on determining the wear of the service brake discs, refer to Testing and Adjusting, "Service Brake Wear Indicator (Existing Brake Disc) - Check" for the machine that is being serviced.