Bredberg was born on 24 February 1884 in Jönköping, Sweden, the son of Anders Petter Johansson-Bredberg and his wife Emma (née Svensson).

[2] Bredberg served as a teacher of tactics at the Royal Swedish Army Staff College from 1918 to 1925 and as captain in the Skaraborg Regiment (I 9) from 1920 to 1922.

[2] Bredberg was made available for service in the Defense Audit (Försvarsrevisionen) from 1920 to 1923 and to the head of the General Commission of the Ministry of Defence and the Special Committee of the Riksdag from 1923 to 1925.

Bredberg was promoted to colonel in 1933 and was appointed Inspector of the Swedish Army Service Troops.

[5] Bredberg was chairman of the Swedish Association of Army, Navy and Air Force Officers (Svenska officersförbundet) from 1936 to 1942, the Försvarsväsendets rullföringsnämnd ("Defense Committee's Enrollment Board") from 1941 to 1942 and the Militära experttjänstekommissionen ("Military Expert Service Commission") in 1942.