Full-back Pett-Ridge celebrated his birthday week by bagging a brace under the Friday Night Lights.
Hooker Will Spain and Windsor wing Mark Venter also scored two tries apiece.
Bracknell’s Leroy Hove, and centre Nathan Killilea also crossed the whitewash for the hosts, before a final try saw the game come to an early close.
Cox, meanwhile, slotted an immaculate eight conversions from eight at Old Bath Road.
Ex-Colts Charlie Burton, Aaron Preston, Louis Roumignac and Dan Sawyer also featured along with Development XV players Ethan Bassett, Ollie Morgan, Olly Marsh, Max Hughes and Sam Kaminaris.
Berkshire Under 20s visit Gloucestershire on Sunday, April 19.
Victory would secure them South West Pool Two of the Jason Leonard County Championship.
