True bolt on 2″ drop spindlefront and rear power disc brake system for your 55-57 Chevy Fullsize car. These kits include all items shown in picture. Standard booster size is an 8″ single diaphragm but you can choose from different sizes and diaphragm types. You can also choose braided stainless brake hoses and drilled and slotted rotors. These disc brake kits are great for smaller rim and tire combos. Works with most aftermarket 14″ wheels. Front calipers brackets mount to your original spindle making installation a snap! Rear setup usesGM ratcheting calipers with emergency brake integration.