Ford 2006 Explorer Owner's Manual page 224

Driving
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If the parking brake is fully released, but the brake warning lamp
remains illuminated, the brakes may not be working properly.
See your authorized dealer.
Driving with a 5–speed automatic transmission (if equipped)
This vehicle is equipped with an Adaptive Transmission Control Strategy.
This Adaptive Transmission Control Strategy offers the optimal
transmission operation and shift quality. When the vehicle's battery has
been disconnected for any type of service or repair, the transmission will
need to relearn the normal shift strategy parameters, much like having to
reset your radio stations when your vehicle battery has been
disconnected. The Adaptive Transmission Control Strategy allows the
transmission to relearn these operating parameters. This learning process
could take several transmission upshifts and downshifts; during this
learning process, slightly firmer shifts may occur. After this learning
process, normal shift feel and shift scheduling will resume.
224
2006 Explorer (exp)
Owners Guide (post-2002-fmt)
USA (fus)