Do large and heavy Airliners, Jumbos and Super Jumbos wide bodies included use full thrust for braking when reversers are deployed? What is the thrust setting?
Flight manual procedures and operators‘ policies notwithstanding, they would typically use full reverse thrust when the stopping performance requires so, and idle reverse thrust when not. The latter setting means less wear on the engines and lower noise. The former setting overrides these considerations when safety demands it.
* the manufacturer's recommendations,
* the operator's policies,
* the airport's procedures,
* the Captain's wishes.
A 747 landing in LHR will probably only use Reverse Idle, whereas landing on a classicly-Caribbean airport may go to Full Reverse.
And the A380 only has 2 reversers, so that may affect the policy on that aircraft.
Thrust reverser works best on contaminated runways. On a relatively dry runway, full vs idle thrust reverse has negligible effect on braking. However, on icy runways, full trust reverse has a much greater effect on stopping distance. This information comes from the Airbus operational manuals.