One problem related to brake popping noise has been reported for the 1998 Toyota Sienna. The most recently reported issues are listed below.
The brakes have made lots of noise since 1 month after purchase. We heard popping noises, sounds like a spring unloading, snapping sounds. Dealer (classic Toyota, waukegan, illinois. ) has attempted to repair 3 times. Latest fix stopped popping snapping noises but now the abs system engages without need, the brakes moan and make new noises. We havent experienced failure, yet. I looked up registered complaints and many have experienced failure. We are taking the van back for the 4th time Friday 2-24-00.