strange noise when slowing down/braking

[ryhi]

hey guys. as some of you might know, i recently picked up my 4runner a few weeks ago and absolutely love it so far. it runs and drives great but i have noticed something that i find pretty strange. i have searched the forum, but have come up with no threads explaining my exact situation.

here is the issue:

intermittently upon braking or just slowing down, i hear a light airy/vacuum-like sound coming from around the steering column, and is always followed by a single click that comes from the front passenger side. there is no weird feeling/vibrating, etc. in the brakes. just the noise that i found to be strange.

im hoping someone would be able to give me any insight on what it could be. this is happening on my 02 4wd sport

 

[PalmettoRunner]

Yes this is completely normal on the 01's and 02's, something to do with the ABS if I recall.

Found this by searching "2001 pumps noise"...

http://www.toyota-4runner.org/3rd-gen-t4rs/16648-odd-noise-01-4runner.html

 

[ryhi]

thank you thank you thank you palmetto! good news to know this is normal. I still find it odd that toyota would do this, but at least it's really only noticeable when the radio is off!