Although the "very fast" part is not all that true - Stukas, SBDs, A-36s, Vals, etc. all deployed dive-brakes that limited their dive speed.
The SBD's massive dive-brakes held it steady at 250mph in it's 70-80 degree dive.
The Stuka was about 350mph in it's near-vertical dive.
The A-36 Mustang was about 390mph and the D3A 273mph.