Some cars leave a paper trail; the Brabham BT21 left a name and a place in Brabham's list. What follows is what can be said with a source behind it.
In context
Nearby in the Brabham catalogue sit the Brabham BT18 and the Brabham BT43.
The record
The open record for the Brabham BT21 carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.