Master cylinder

A multiple circuit master cylinder assembly having a pressurizing chamber for each circuit and an individual fluid reservoir for each pressurizing chamber and a single primary fluid reservoir for all of said individual fluid reservoirs,

• a body defining said pressurizing chambers and said individual fluid reservoirs with open individual reservoir tops defining a lip in a substantially regular surface,
• a second body secured to said one body and of mating conformation at said surface and closing said individual reservoir tops so as to define a bottom surface that bears against the entirety of the lip, the second body further having fluid transfer ports of small cross section in relation to the reservoirs therethrough providing continuous fluid communication between said primary reservoir and said individual reservoirs,
• said first body having compensation ports between said individual reservoirs and said pressurizing chambers, the axes of said compensation ports being offset from the axes of said fluid transfer ports to minimize the flow of return compensating fluid under pressure to said primary fluid reservoir by a squirting action,
• and a fluid level sensor sensing at least a decrease in fluid level below a predetermined level in said primary fluid reservoir.

A multiple circuit master cylinder assembly having a pressurizing chamber for each circuit and an individual fluid reservoir for each pressurizing chamber and a single primary fluid reservoir for all of said individual fluid reservoirs,

• said pressurizing chambers and said individual fluid reservoirs being formed in one body with open individual reservoir tops,
• said primary fluid reservoir being formed in a second body secured to said one body and closing said individual reservoir tops and having fluid transfer ports therethrough providing continuous fluid communication between said primary fluid reservoir and said individual reservoirs,
• said first body being a casting and said second body being a stamped metal body welded to said first body at said individual reservoir tops,
• and a fluid level sensor sensing at least a decrease in fluid level below a predetermined level in said primary fluid reservoir.

A multiple circuit master cylinder assembly having a pressurizing chamber for each circuit and an individual fluid reservoir for each pressurizing chamber and a single primary fluid reservoir for all of said individual fluid reservoirs,

• said pressurizing chambers and said individual fluid reservoirs being formed in one body with open individual reservoir tops,
• said primary fluid reservoir being formed in a second body secured to said one body and closing said individual reservoir tops and having fluid transfer ports therethrough providing continuous fluid communication between said primary fluid reservoir and said individual reservoirs,
• said one body having compensation ports between said individual reservoirs and said pressurizing chambers the axes of which are offset from the axes of said fluid transfer ports to minimize the flow of return compensating fluid under pressure to said primary fluid reservoir by a squirting action,
• and a fluid level sensor sensing at least a decrease in fluid level below a predetermined level in said primary fluid reservoir.