There are a few ways to know you need to immediately replace your clutch before it causes more problems to the rest of your car's mechanism. If you notice grumbling noises or squeaking when the pedal is pressed or if the engine revs, but the acceleration is poor, you should replace it. However, if you notice sticking or difficulty shifting gears, it's essential not to delay and to replace the mechanism immediately because it could sputter when breaking and cause an accident.