A top-lock brake is operated from a lever or pedal positioned at the top of the caster near the mounting plate, rather than down near the wheel — designed for easier access without bending down or reaching under equipment.
The mechanism itself still locks the wheel (and sometimes swivel), but the operating point is positioned for convenience, which matters on tall equipment or carts where reaching a low-mounted brake is awkward.
Tall carts and equipment where a low, wheel-level brake lever would be hard to reach or operate comfortably.
Not checking operator accessibility before choosing a brake style. If staff will be engaging the brake frequently, lever position and ease of reach matters as much as the locking mechanism itself.
Is a top-lock brake different from a face-contact brake?
Top-lock describes where the operating lever is positioned (near the top); face-contact describes how the brake engages the wheel. A caster can combine both.
Does top-lock lock the swivel too?
Depends on the specific model — some top-lock casters lock swivel and wheel together, others just the wheel. Check the product listing.