I am a relatively new owner of a 2007 Prius and am curious about a sound I hear quite often while driving. The sound is similar to a cd changer changing disks my package doesn't have the disk changer). It seems to happen when braking but I haven't pinned it down to one catalyst. It seems to be a normal sound and I am not worried about it since riding in my roommates '07 Prius and heard the same sound. Any insight on this sound? Thanks! Joe
I bet it's the brake systems accumulator pump ... does it sometimes go even when the car is off? That pump maintains a pressure for the odd and complicated brake system...inchuding the pedal feel which is simulated.
The rattlesnake-like brake noise should be repro if you pump the brakes repeatedly, even if the car's power is off.
