Wilwood's hydra-mechanical combination parking brake calipers use hydraulic pressure for stopping and a mechanical locking mechanism for a parking brake. These redesigned units provide new options for drum brake conversions and disc upgrades on rear axles that are not conducive to internal shoe systems. These calipers, when matched with the correctly proportionate rotor diameter, provide balanced bias and brake performance for front wheel brake upgrades. They are the perfect complement of high-tech style to custom wheel, tire, and suspension modifications.