Before conducting any tests on a hydraulic brake booster, which items should you check?

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The test focuses on making sure the hydraulic brake booster has a proper hydraulic supply and its drive system is in good shape. A hydraulic brake booster depends on the power steering pump to provide the pressurized fluid that assists braking, so if the power steering fluid is low or contaminated, or if the pump isn’t driven properly, the booster won't function correctly during testing. Checking the power steering fluid level, the condition of the power steering belt, and the belt tension ensures the pump can deliver consistent hydraulic pressure to the booster. Other fluids like engine oil, transmission fluid, or engine coolant don’t directly affect the booster’s hydraulic supply, so they aren’t part of the necessary pre-test checks for this item.