Having a little trouble with brakes...

[Machspeed]

This only happens after i've been warming up the car, and i release the e brake and roll towards the stop sign in front of my hill. Now what i do is give it a little brake because its on a hill. While i do this, i feel like a kinda buzz on the brake pedal and suddenly the pedal gets hard and the brakes kinda lock up a little. But then it just goes back to normal. Its never done it except in front of my house right after its been warmed up and I try and drive away. It only does it once but it seems like it may be getting worse. This has been going on since i got my SHO in june of 2001. Im thinking its the brake booster? Any ideas? Could this turn into a major problem?

 

[RStalveyARFF]

There are two things this could be. 1 could be an ABS sensor ring that is cracked, this normally happens on the front CV axles. Second is the ABS relay I think (someone please list the correct name). It is located above the power steering cooler, and has 2 electrical connections to it. Underdog1924 may remember what it was called, we replaced it on his car. I'll lean toward the second listed part as what you're experiencing problems with, but check those rings too. Only $5 at the dealer.