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14. To really get a true comparison of the new brake fluid pressure, we used this brake pressure gauge kit from SSBC and pumped the brakes on a vacuum booster-equipped 2001 Chevy Silverado. At idle, the vacuum booster could only muster a maximum of 700 psi with a constant rate of 550 psi. That doesn’t give us much confidence when pushing the brake pedal, big brakes or not.