Patent ID: 8763392

Claim:
A hydraulic brake booster system, comprising: a primary piston axially moveable within a bore of a cylinder; a booster chamber located rearwardly of the primary piston within the bore; an input rod extending within the booster chamber, the input rod having a first diameter and including a forward portion; a booster vent path in selective fluid communication with the booster chamber; and a seal member located between the forward portion face and the primary piston, the seal member in a fixed relationship with the input rod and configured to (i) seal the booster vent path from the booster chamber when the input rod is in a first position, and (ii) not seal the booster vent path from the booster chamber when the input rod is moved rearwardly within the booster chamber to a second position a poppet assembly fixedly attached to the forward portion of the input rod, the poppet assembly including a forward poppet face and a rear portion having a second diameter larger than the first diameter, wherein the seal member is sealingly engaged with the forward poppet face and wherein the booster chamber is located rearwardly of the rear portion when the input rod is in the first position.