97 Windstar - ABS problem?

The ABS light it's coming on and off; sometimes, without any slippery condition, when it's close to stop you can feel the ABS connecting:banghead: . I have checked on the front the sensors for dirt or something but everything looks OK. I pulled out the ABS fuse and I got the same feeling in the pedal...is it more than one fuse for ABS?:screwy:
The mechanic told me that it's from the back and he wants to replace everything (shoes, drum, etc) I have the feeling that he is trying to make some money on my back....do you guys have any idea?:frown:

I do! Carefully inspect the metal rings (ABS Ring) located on the front axles. Rust builds up and cracks the ring causing false activation. You can see the rings on the backside of the hub. Rotate the axle slowly and look.