It’s preferable to keep your vehicles in good condition so that you can always join a battle. You’ll find the repair index of each car displayed in the Garage.
To repair a vehicle fully and instantly, buy and apply a Repair Kit from the Marketplace for ROW. You can buy as many Repair Kits as you wish. Buying and selling Repair Kits will be available in Phase 2. In Phase one, you can get a Repair Kit exclusively through mining.