If the power steering pump develops leaks, it can drip onto the lower control arm bushing causing the bushing to deteriorate. A knocking noise will be heard when driving over bumps and it may become more difficult to control the vehicle.
Car Problem Reports
Nissan Maxima Leaking power steering pump can cause noise/steering problems
Nissan Maxima Problem
Average Mileage: 106,666 mi (76,000 mi - 140,000 mi)
Visitor, 1999 Nissan Maxima, 140,000 mi
leaking fluid, was told it was power steering pump. Parts and labor to replace $575
no diagnosis except i brought it in to complain about it leaking and the dealer said it was fine (power steering fluid)....so awhile later (yesterday) i was almost killed as i'm traveling down the freeway going to work and the car started to sway left to right, and finally gave out and the sterring no longer worked and the car veered directly into the center median twice (shouldn't have made it out of this violent collision)---but the steering was gone and it went into the median....