This Cat 740 40 tom articulated rock truck was having a problem with the low brake pressure warning buzzer and light coming on while pressing the brake pedal, we tested the pump, the pressure relief valve and the brake oil accumulators, they were all checking out ok. We then disconnected and capped the brake pressure line at each wheel, one at a time, until we found the wheel that we determined to have the issue, as with that line capped the rest of the braking system worked correctly,

So here is a video of us disassembling and reassembling the wheel, planetary and brake unit.

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