My 91 had a leaking passenger side nozzle, I replaced both check valves to be safe since they came in packs of two and the problem persisted. I once again bought a different style of check valve more similar to the stock ones and the problem persisted in both nozzles. I have now replaced the nozzles as well and made sure the hole to release pressure in the wiper fluid cap is clear and it continues to leak. Any ideas? Seems to happen more often when I push the brake pedal.