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We replaced the brake booster. Brake pedal was very low fades and hissing from booster. After booster replacement we flushed the brake fluid & bled system. The brake pedal is still low and fading, no hissing noise from booster now so we calibrated the brake sensor - still no pedal. Unable to be certain if the vacuum pump was damaged when booster failed or if we didn't calibrate the brake sensor correctly. We are about to bleed system with the diagnostic tool now. (vacuum pump has 20psi)Any help would be appreciated
 
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