Tandem brake master cylinder with anti bottoming system

摘要

In a tandem type brake master cylinder having a body formed with coaxial large and small cylinder bores, a first piston member having a large land sliding in the large bore and a first small land sliding in the small bore, a second piston member having second and third small lands sliding in the small bore, a first chamber defined between the large land and the first small land, a second chamber defined between the first and the second small lands, a third chamber defined between the third small land and a closed end of the small bore, a first spring biasing the first and second piston members apart, a second spring biasing the second piston member away from the closed end of the small bore, first and second outlets opening from the second and third chambers respectively, and a means to allow fluid to pass from the first chamber to the second chamber but not back, a means is provided to prevent the first piston member and the second piston member from becoming separated by a distance greater than a certain predetermined distance.