Brookes got the best start of the lot with Redding in contention close behind, poised to strike at any point as part of a four-bike chasing pack.
The opportunity presented itself just two laps later when Christian Iddon made a move for the race lead and made contact with Brookes, who dropped back to fourth while Redding eased into a lead he would build into the halfway point of Race 1, when rain hit and the pack were able to reel him in.
Scott Redding storms to victory in Race 1
Bridewell led the chase and closed in his fellow Brit but Redding responded with the fastest lap of the race three from the finish and took the chequered flag two seconds clear.
His team-mate Brookes was embroiled in an almighty scrap for the final place on the podium but he ensured it was an all-Ducati ceremony by eventually pulling clear of Peter Hickman and Christian Iddon, who ended up fourth and sixth respectively.