Our 2004 Rav4 (50000 miles on the clock) has had some issues going on with the ABS sensors. Every now and then the brake peddle felt like the ABS kicked in for 1 cycle and then a short time later on the dash the tire pressure light starts blinking, the ABS light comes on and the traction light came on. I took it to the local Toyota dealer and they diagnosed it as having the front backing plates have rotted off and the ABS sensor was getting dirty. What does the ABS sensor look like and how do I clean this myself? The dealer quoted over $1000.00 to replace the backing plates and suggested I just clean the sensors myself when this happens and to save $1000.00 I think I can do this with some help figuring out how it's done. The service fellow did say I would need an air compressor so I am guessing they blew out the dirt?