2005 Chrysler 300C trouble code C1035
 

I just picked up a 2005 Chrysler 300C that has trouble code C1035. I used my Code reader to figure that out and it said something to the effect of right rear speed sensor?? So I went to the dealer to buy this ABS sensor, replaced it, cleared the codes, did the reset on the steering wheel thing as well. All lights were off. I backed the car out of the driveway, headed down the street. I got about 15 feet before it popped back up. So if it's not the ABS right rear sensor, what else can it be?
Also not sure if this is common for the 300C, but when the car is cold and I just start it up, back out of the driveway, head down the street. I hear a gush of fluid near the top of the driver side dashboard area. Almost sounds like something is pouring out, but it's not. The only thing I see on the opposite side in the engine compartment is the master cylinder and reservoir. Not sure if this is related to my ABS/ESP light illuminating on my dashboard. Any help would be greatly appreciated.