The BMW 3.0Si Brake Booster enhances stopping power, converting light pedal input into muscular hydraulic force to shorten every potential emergency stop. Built around a vacuum assisted diaphragm or, on select performance trims, a hydraulic chamber, the Brake Booster is renowned for its rock solid reliability and quick response that fits the lively character of a BMW sedan. The booster is, depending on the age of the 3.0Si, fitted to either an inline six drawing suction or later 3.0Si variants fitted to the steering pump pressure. Whatever it may be fitted to, the pedal feel is always consistent, despite being under heavy load. The Brake Booster has solid construction that can withstand heat and vibration. The internal valve seals hold vacuum for years, and the power piston multiplies foot effort. As a result, many BMW fans claim it outlasts many other wear items. Every 3.0Si has a balanced chassis, thanks to the Brake Booster, which allows the driver to modulate the deceleration with fingertip precision, trimming fuel consumption as the engine is able to avoid unnecessary extra throttle to overcome heavy pedals. The unit can be bolted directly to factory master cylinders throughout the 3.0Si lineup, so coupes, sedans, and long wheelbase versions all receive identical assist without extra parts. In traffic, the Brake Booster's quick bite reduces stopping distance. On open roads, it lends a hand to the 3.0Si during high speed touring, keeping discs cooler with shorter engagement times. A fail-safe valve maintains some level of assistance if the vacuum falls, and the hydraulic variety's electric back-up reservoir, these attributes are what make this Brake Booster special in what is an increasingly crowded marketplace and stresses the brand promise that every BMW badge carries. The lightweight construction reduces mass at the firewall so that the BMW suspension can react more quickly to bumps. This reminds why this Brake Booster remains a cornerstone of dependable performance engineering. Choosing original equipment retains an authentic BMW driving experience.
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