The main advantage of the Volvo 740 Brake Booster is that it increases the pressure on the brake pedal, and the car can come to a halt rather quickly without strong leg muscle effort. The Brake Booster, which is situated between the master cylinder and the pedal arm, is dependent on two assistance styles. The vast majority of versions are fed by the engine via a vacuum chamber. At rest, the same vacuum is on either side of a flexible diaphragm, and therefore no extra push is provided. When the pedal is pressed, a valve opens, allowing outside air to rush through the rear section, and this shift in pressure causes a power piston to be pushed, whose movement provides powerful braking with minimal effort. A hydraulic unit, which borrows pressurised steering fluid or uses an electric pump, was adopted in some Volvo 740 cars in the line, thus helping even with weak engine vacuum. The hydraulic design is good at repeated high-load stops, and the lighter vacuum shell remains reliable and simple to service. Volvo models of the same year were similar in terms of their basic mounting points, and thus swapping was easy. Once an engine stalls, the remaining vacuum or fluid charge can provide the necessary assist for just a few presses, and then the effort on the pedal suddenly increases, an easy indication that the Brake Booster is no longer assisting. This choice enabled Volvo to retain a steady and confident pedal touch for drivers across all Volvo models.
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