776D, 777D and 777D HAA Off-Highway Truck/Tractors Air System and Brakes Brake Hydraulic System Caterpillar


Brake Hydraulic System
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1.1. Standard Brake System
2.1. Brake System with Front Oil Cooled Disc Brakes

Standard Brake System




Illustration 1g00917353

(1) Left rear wheel brake assembly

(2) Right rear wheel brake assembly

(3) Left front wheel brake

(4) Right front wheel brake

(5) Oil cooler

(6) Screen

(7) Oil line from parking brake release sections of the oil pump

(8) Diverter valve

(9) Oil cooler

(10) Screen

(11) Air line from service/retarder brake engagement

(12) Oil line from hoist and rear brake cooling oil pump

(13) Air line from secondary air reservoir

(14) Towing diverter valve

(15) Oil line from secondary pump

(16) Slack adjuster

(17) Oil line from torque converter

(18) Parking and secondary brake control valve

(19) Relief valve for parking brake

(20) Air line from front brake relay valve

(21) Air line from rear brake relay valve

(22) Brake master cylinder for the front wheels

(23) Brake master cylinder for the rear wheels

(24) Makeup oil line

(25) Check valve

Brake System with Front Oil Cooled Disc Brakes




Illustration 2g00917360

(1) Left rear wheel brake assembly

(2) Right rear wheel brake assembly

(3) Left front wheel brake

(4) Right front wheel brake

(5) Oil cooler

(6) Screen

(7) Oil line from parking brake release sections of the oil pump

(8) Diverter valve

(9) Oil cooler

(10) Screen

(11) Air line from service/retarder brake engagement

(12) Oil line from hoist and rear brake cooling oil pump

(13) Air line from secondary air reservoir

(14) Towing diverter valve

(15) Oil line from secondary pump

(16) Slack adjuster

(17) Oil line from torque converter

(18) Parking and secondary brake control valve

(19) Relief valve for parking brake

(20) Air line from front brake relay valve

(21) Air line from rear brake relay valve

(22) Brake master cylinder for the front wheels

(23) Brake master cylinder for the rear wheels

(24) Makeup oil line

(25) Check valve

(27) Oil line from the front brake section of the oil pump

(28) Slack adjuster for the front wheel brakes

Information System:

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