AC/DC Well, HELLS BELLS!! Our Bassist Is Bailing Too

9/20/2016 9:24 AM PDT

AC/DC's Bassist Bailed

Breaking News

And then there was one -- AC/DC bassist Cliff Williams is quitting the band ... leaving Angus Young in his knickers as the last man standing.

66-year-old Williams, who's been playing bass since 1977, announced he's tapping out from recording and touring with AC/DC once they wrap up their current world tour ... so he can chill and have some family time.

The band's fallen apart in recent years -- guitarist Malcolm Young quit when he got dementia, drummer Phil Rudd ditched after a drug conviction, and lead singer Brian Johnson lost his hearing.

Axl Rose has been filling in for Brian during the tour ... which is now looking like the last rodeo for the legendary rockers.