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When vacuum boosters first came out, they provided an enormous advantage for car manufacturers. if you have ever operated a vehicle with manual brakes, you know that they don’t work even close to as well as their power brake counterparts. Vacuum boosters increased the braking pressure to about 800 to 900 pounds. However, with hydraulic brake boosters, this number more than doubles, giving you up to 2,000 to 2,700 pounds, depending on the system.
When you steer, fluid pressure is built up in the power steering pump due to the constant circulation of the power steering fluid. This hydraulic pressure, in a hydraulic brake booster system, is then stored in an area called an “accumulator.” When you push on your brakes, the pressure is taken from the accumulator to the vehicle’s master cylinder via the hydraulic booster system, effectively stopping the car.
Braking systems that use a hydraulic brake booster are known for being sensitive, needing only about half of the applied pedal pressure to create the same amount of brake pressure as conventional vacuum booster brakes. Because of this and other reasons, they are widely sought after for diesel engines, but they are still the minority compared to vacuum brake boosters.