Electric park brake

A brake apparatus operable by an electric motor, said apparatus comprising:

• a housing having a bore extending therethrough and an axial opening therein;
• a piston positioned within said bore and moveable between at least a first position and a second position;
• a driving member extending through said axial opening to operatively connect said piston to said electric motor, wherein rotation of said driving member facilitates movement of said piston between said first and second positions;
• and
• a bearing positioned between said driving member and said housing, said bearing including at least one friction reducing device adapted to facilitate rotation of said driving member relative to said housing, wherein said bearing is adapted to engage said driving member to prevent said driving member from moving proximally beyond a predetermined distance.

A method for assembling an electric park brake assembly, said electric park brake assembly including a piston having grooves and a screw member having grooves, said method comprising the steps of:

• applying a viscous material to at least one of said grooves of said piston and said grooves of said screw member;
• engaging said grooves of said piston with said grooves of said screw member to form a ball screw assembly;
• and
• introducing a hydraulic fluid to said ball screw assembly.