Britax Flexx Instruction Manual page 26

STROLLER OPERATION
USING THE BRAKES
B When the stroller is being used in
single stroller mode, press down on
the upper section of the brake pedal
to disengage the parking brake.
C When the stroller is being used in
tandem mode (e.g. using the second
seat or bassinet in the lower position
on the stroller), lift the lower section
of the brake pedal with your foot to
disengage the parking brake.
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