In brake holding capacity testing, which of the following actions is required?

• A. Fully elevate the aerial.
• B. Extend 10 feet and measure brake slippage for 5 minutes.
• C. All of the above.
• D. Verify slippage does not exceed manufacturers specifications.

Answer: (C)

Brake holding capacity testing ensures the aerial stays in place when its brakes are applied, even under the forces of elevation and extension. To properly assess this, you perform steps that mirror real operating conditions. Fully elevating the aerial checks that the brake system can hold the unit at maximum height, resisting the weight and any dynamic forces. Extending the arm to 10 feet and measuring brake slippage for five minutes tests the hold while the platform is extended, where gravity and load can cause creeping if the brakes or drive components aren’t performing correctly. Verifying that the measured slippage does not exceed the manufacturer’s specifications confirms that the observed hold meets defined tolerances and is safe to use. Taken together, these actions provide a complete check of the brake holding capacity, so all of them are required.