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...the breaking after takeoff is automatic....
After which the picking up of the pieces is a manual affair ...
Pre-retraction wheel braking is an automatic function.
Now IF an aircraft is dispatched with a wheelbrake deactivated, that one wheel could be spinning for a while, possibly with associated noise. It is also possible that the procedure then describes to wait a certain amount of time with retraction to let the spinning reduce to an acceptable level before retraction. The period of flight with gear down would also be noisier than usual after take-off.