The phrase "left pedal" refers to the pedal on the left side of a vehicle, typically a car or a bicycle, that is used to control the clutch (in a manual transmission car) or the foot brake (in an automatic transmission car). Full definition
Not only do your feet never leave the pedal, but also the pedal adjusts to the angle of the elliptical stride. (verywellfit.com)
Three days later, with a much lighter left pedal and a considerably lighter pocket, the Lambo was running better than ever, especially with it having had the drive - by - wire throttle parameters reset while it was in. (evo.co.uk)