Brake monitoring system

A vehicle brake monitor, comprising:

• a brake actuator including a housing and a cylindrical rod reciprocable through an opening in said housing for actuation of a vehicle brake;
• a sensor sleeve generally surrounding said rod and fixed relative to said housing having a magnet and a generally opposed sensor located within the magnetic field of said magnet;
• a magnet shunt having a predetermined length less than the length of said rod mounted on said rod to reciprocate with said rod and extending longitudinally along and radially from said rod between said sensor and said magnet;
• and
• said magnet shunt interrupting a signal between said magnet and said sensor when said magnet shunt is located between said magnet and said sensor during reciprocable movement of said rod, thereby signaling a reciprocal position of said rod.

A vehicle brake monitor, comprising:

• a brake actuator including a housing and a rod reciprocable through an opening in said housing for actuation of a vehicle brake;
• a sensor sleeve mounted on said housing surrounding said rod having a radial opening;
• a magnet and a sensor in said sensor sleeve on opposed sides of said radial opening;
• a shunt sleeve mounted on said rod and fixed to said rod for reciprocal movement with said rod;
• one of said shunt sleeve and said sensor sleeve including a radial keyway and the other of said sensor sleeve and said sensor sleeve including a radial key slideably received in said keyway fixing the relative rotation and said sleeves;
• a magnet shunt mounted on said shunt sleeve having a predetermined length extending radially into said radial opening in said sensor sleeve between said magnet and said sensor as said shunt sleeve reciprocates with said rod through said housing opening;
• and
• said magnet shunt interrupting a signal between said magnet and said sensor when said shunt is located between said magnet and said sensor during reciprocal movement of said shunt sleeve, thereby signaling a position of said rod relative to said housing.

A vehicle brake monitor, comprising:

• a brake actuator including a housing and a rod reciprocable through an opening in said housing for actuation of a vehicle brake;
• two pairs of generally opposed spaced magnets and sensors fixed relative to said housing;
• two shunts fixed relative to said rod, each of said shunts reciprocable with said rod between one of said pairs of generally opposed spaced magnets and sensors;
• said shunts interrupting a signal between said pairs of magnets and sensors at different reciprocal positions of said rod as said rod reciprocates through said opening of said housing, said sensors thereby sensing different positions of said reciprocable brake actuator rod relative to said housing.