I have a 99 Suburban 2500 with the hydroboost brake system. I replaced the hydroboost booster about 5 months ago when i was putting new brakes on the truck because it was leaking. One of the hydroboost lines or the power steering pump is also slowly leaking which I have not gotten a chance to replace. The problem is when driving the truck today,after refilling the fluid which was low, when you turned the steering wheel it would apply the brakes. Any ideas, did air get in the system from the low fluid? Thanks in advance. This is my first truck with this system.