What is the effect of pressure plate release lever adjusting bolts being set at different heights?

When pressure plate release lever adjusting bolts are set at different heights, this can lead to an uneven release of the clutch assembly. As a result, the clutch pedal may exhibit a pulsating feel during operation. This pulsation occurs because the clutch is not being disengaged smoothly, leading to an inconsistent engagement/disengagement cycle. A properly adjusted clutch system ensures that the release levers operate uniformly, providing a consistent feel in the clutch pedal and enabling smooth transitions between gears.

The other potential effects, such as clutch slippage, excessive wear on gears, or noise from the transmission, are more closely related to other issues within the clutch or transmission system rather than specifically arising from unevenly set release lever adjusting bolts. Thus, the correct answer highlights the direct impact on clutch pedal feel due to improper adjustment of the release lever bolts.