1991 Corvette brakes fade once car gets very warm

Best guess. When the brake fluid gets warm during use the viscosity of fuild thins. Or can even boil. If the system was not bleed properly. Or enought fluid added. Or the wong dot fluid used. May be the cause of the problem. Also make sure that the master cyclinder was not replace. If the it was. A rebuilt master cyclinder or the wrong master cyclinder may have been used. One other source may be a vacum leak or air leak on the brake booster. If the master cyclinder was leaking the fluid can cause the brake booster seals to leak. Causing brake fading. Please have some one check these ideas. Brakes are not something to take lighty. Your life or someone eles may be at stake.