Edwards & Co OSCAR MX HMV501 Instruction Manual page 22

PARKING BRAKE & SWIVEL LOCK
Parking brake:
To engage the brake, depress the rear of the red brake pedal
downwards. Give the stroller a small jiggle to ensure it engages.
This brake locks both rear wheels.
To release the brake, repeat by pressing the pedal downwards.
Front wheel swivel lock:
The swivel lock is located on the front wheel housing.
To lock the swivel, depress the slider downwards.
To free the wheel, lift the slider upwards.