The ship was ordered on 11 August 1937 from HM Dockyard Devonport, with engines supplied by Barclay Curle. She was laid down on 22 November 1937, and launched on 12 July 1938. After sea trials in July 1939 Bramble was assigned to the 1st Minesweeping Flotilla at Portland Harbour, sailing with the Flotilla to Scapa Flow in August. She served as a minesweeper in the North Sea until February 1941, when she transferred to Harwich for operations in the Thames Estuary.[2]
In April 1941 she was transferred to Western Approaches Command for Atlantic convoy escort duty, and attached to the 3rd Escort Group. Between 22 July 1941 and 16 November 1942 she was commanded by Captain John Crombie.[3] In October she was detached to serve on the Russian convoys, and joined Convoy PQ 2 sailing to Arkhangelsk, where she remained carrying out local minesweeping and patrol duties, as well as escorting in- and out-bound convoys. She returned to the UK in January 1942 to be refitted at a yard in Sunderland. She returned to convoy duty in April, returning to Russia with Convoy PQ 15. She served there until October, when she returned to the UK to be repaired at a shipyard in the Humber.