Inspect the pads, if they are worn (thin), take your vehicle to your authorized Sparrow dealer for replacement.
Brake Information
If you lie down on your back under the rear of the Sparrow and look up,
you will see the two knobs pictured to the left. These are the brake adjustment
knobs that should only be adjusted by an authorized Sparrow dealer.
CAUTION: DO NOT MANIPULATE these knobs in any manner.