Caterpillar Inc.

John H Hill

Randall L Mooberry

Daniel J Schartman

A brake assembly, having a plurality of co-operating rotating and non-rotating brake discs, includes a dump valve mechanism, including a spool valve. The spool valve is adapted to move between first and second positions to close and open fluid communications between a fluid supply passage and a fluid dump passage. Excess cooling fluid supplied to a brake assembly when the brakes are inactive causes 'brake drag' which wastes power and decreases machine efficiency. By dumping the cooling fluid to a fluid dump passage when the brakes are inactive, the 'brake drag' is reduced.

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Edelstein, IL, United States of America

John H Hill