The easiest way to tell which system your specific 1988 Corvette has is to:
1. Check the RPO codes: The best and most definitive way is to look at the vehicle's original window sticker or the RPO code sticker (usually located in the glove compartment or under the hood). Look for the following:
* J55: This code indicates the optional performance brake system. This system had larger rotors and calipers than the standard system, providing better stopping power.
* Absence of J55: If you don't see J55, it's the standard brake system.
2. Visually inspect the calipers and rotors: While not foolproof (as parts could have been changed), a visual inspection can offer a clue. The J55 system generally had larger diameter rotors and calipers than the standard system. You'll need to compare your Corvette's brakes to known specifications found online via a Corvette parts website or forum to be sure. Measure the rotor diameter, though you'll need to consult a reference source for the correct sizes.
In summary, checking the RPO codes is the definitive method. Visual inspection is only a helpful secondary method, and requires a bit of research to compare what you see to known specifications for each system.
