General Motors France

Andre Vachet

Henri Savidan

A dual master cylinder (10) for the braking system of a motor vehicle comprising a primary portion and a secondary portion (14) in which the high pressure chamber (56) of the secondary portion includes a check valve (62) mounted within a piston bore (64) in the secondary piston (44), the piston bore providing a fluid passage (70,96,66) between the high pressure chamber and the low pressure chamber (48) of the secondary portion, the check valve allowing hydraulic fluid to flow through the fluid passage during a rest mode or a release mode of the dual master cylinder, but preventing such flow during an apply mode. Prevents damage to elastomeric cup seal (52) when back-pressure is generated by ABS dus to the absence of a dilation port in the secondary portion, which is no longer required due to the presence of the check valve.

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Seugy, France

Andre Vachet