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My brakes are acting up. When I apply the brakes it sounds like a blast of air coming from the pedal and the motor revs slightly. No visible leaks anywhere.
What do you think? Brake booster, master cylinder, vacuum line?
Do you have cruise control? It sounds as though the cruise control servo is dumping air pressure, but the system isn't getting the signal to stop adding more air. Check your brake lights to make sure they're working properly. The leads on the brake pedal switch tend to break internally (invisibly) due to flexing. This switch controls the cruise control and brake lights.