C-24.2, r. 32 - Regulation respecting safety standards for road vehicles

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37. A vacuum boost system shall have enough power in reserve for 3 assisted service brake applications while the engine is off. If the system has a warning light or buzzer, it shall operate where the vacuum is less than 2 kPa.
In the absence of a manometer, the vacuum shall be sufficient for an assisted braking when the warning device comes on.
A vacuum pump shall be capable of providing and maintaining a minimum vacuum of 4.5 kPa.
O.C. 1483-98, s. 37.