Question

use of a jack stand in combination with a vehicle lift
high jack stands are commonly used in combination with vehicle lifts. the jack stands allow the wheels to hang freely. this is necessary when working on the brakes or parts of the suspension.
position the jack stands cups on load - bearing, solid parts of the vehicle. lower the car lift about a few cm. then jounce the vehicle to make sure its stable on the jack stands. if the vehicle is not stable, then bring the lift back up and reposition the jack stands.
note:
never lower the vehicle lift any further than necessary (usually a few centimetres).
a vehicle is sitting on a four - post vehicle lift. the rear brake discs require replacement.
how can you ensure the rear wheels turn freely?
by placing high jack stands under the rear axle and lowering the vehicle onto them.
by placing a floor jack on the ramp and jacking up the vehicle.
by pushing up the rear axle using a transmission jack.
check

Explanation:

The text mentions that high jack stands are used to allow wheels to hang freely when working on brakes. Placing high jack stands under the rear - axle and lowering the vehicle onto them will ensure the rear wheels turn freely as it is a proper method for working on the suspension and brake components. The other options like using a floor jack on the ramp or a transmission jack to push up the rear - axle are not the standard way to achieve free - turning rear wheels for brake disc replacement.

Answer:

By placing high jack stands under the rear axle and lowering the vehicle onto them.