will assume this is an ABS car. There were two common ABS systems Chrysler used during this time period and both relied on an electrical pump to provide the boost for the brakes instead of a conventional vacuum assisted brake booster. I think the TC may have used a similar system but not quite the same as the regular Chrysler (Bosch and Bendix) ABS system. The pages here on Allpar point to the TC using a Tevis ABS system. Most likely the pump has failed and will need replaced. That can be very expensive, but probably finding a dealer that can diagnose the system with a scanner is the only way to know for sure. You can remove the ABS system and replace it with a non-ABS system from a car like a 1990+ LeBaron, though it requires a lot of work and even changing the brake pedal assembly.