I not very technical but if my understanding is right - What you are talking applys to
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""bigger vehicles do have a dedicated vaccum pump(or compressor) to feed booster & not brake fluid directly.""
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like trucks tempo's etc.
I would like to quote from somewhere I read a long time ago!(May be How Stuff Works)
Generally four types of power brakes exist. These can be categorized under vacuum suspended; air suspended; hydraulic booster, and electro-hydraulic booster. The first being, the most preferred kind in power brakes.
In cars with vacuum booster type system, the brake pedal pushes the pushrod connected to the pistons within the master cylinder. Simultaneously, the pushrod opens the vacuum-control valve so that it closes the vacuum port and seals off the forward half of the booster unit. The engine vacuum line then creates a low-pressure vacuum chamber. Atmospheric pressure in the control chamber then pushes against the diaphragm. The pressure on the diaphragm forces it forward, supplying pressure on the master cylinder pistons. When the brake pedal is released, outside air supply is sealed off and vacuum valve is reopened. This restores vacuum to both sides of the diaphragm, allowing everything to return to its original position.
Unquote
To the best of my knowledge - A Maruti uses a vaccum booster type.