Tried rolling my car back a little into the shade without turning it on and had to press extra hard on the brakes for it stop.
In: Engineering
Cars have what is called a brake booster which use force from the engine to help you apply the brakes. Traditionally this used a vacuum servo connected to the engine air manifold but in cars without a carborator they need a dedicated vacuum pump powered by the engine. In more modern cars they may have implemented a similar system that does not use vacuum in order to avoid the dedicated vacuum pump. But they still have a brake booster as well as a steering servo. So if the engine is off these are not powered and the car becomes hard to control.
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