Paul Rogers wrote:

> on the way passed a
> retaining wall that was echoing back a knocking sound from the passenger side
> front wheel.

From the description it sounds like a CV bearing knocking. Knocking CV's require
replacement.

Usually, Front Wheel Bearings will announce their impending demise with a slight
growling noise, which will get progressively louder  with  the passage of time.

Luck,

John Rodgers
88 GL Driver