Parking brake release apparatus

Brake release apparatus for a vehicle having a frame, wheels, a parking brake for at least one of said wheels, a parking brake pedal pivotally mounted to said frame to apply said parking brake, said pedal having a braking and a brake released condition, brake return means opposing braking movement of said parking brake pedal, an engine to provide driving power to at least one of said wheels, said engine when operating having a range of possible rotational frequencies, said release apparatus comprising:

• releasable lock means adapted to lock the parking brake pedal in its braking condition;
• lock release means adapted selectively to release said lock means and selectively to prevent said lock means from locking;
• and engine frequency responsive means connected to said lock release means and adapted to require said lock release means to permit said lock means to lock at frequencies below a pre-selected frequency, and to release said lock means if locked at frequencies at and above said pre-selected frequency, and to prevent said lock means from locking if unlocked at frequencies at and above said pre-selected frequency, all in direct and unique response to the frequency of said engine.