Drum brake device

A dual mode drum brake device comprising:

• a back plate,
• two brake shoes provided to face each other on top of said back plate,
• a service brake actuator on said back plate between one pair of the first adjacent ends of said brake shoes,
• an anchor block on said back plate between the other pair of the second adjacent ends of said brake shoes,
• a long link pivotably mounted at a pivot point on one brake shoe,
• a shoe clearance adjustment device adjacent to said service brake actuator provided between the other brake shoe and one end of said long link, said one end of said long link being functionally engaged with said shoe clearance adjustment device,
• a parking brake actuator adjacent to said anchor block provided between the other brake shoe and the other end of said long link, said other end of said long link being functionally engaged with said parking brake actuator, said pivot point being between a first engaging portion of said brake shoe and said shoe clearance adjustment device and a second engaging portion of said long link and said parking brake actuator, and
• shoe return spring means for returning said brake shoes to an original position following activation by one of said service brake actuator and said parking brake actuator, wherein the force urging the second adjacent ends of the brake shoes toward each other, is greater than the force urging the first adjacent ends of the brake shoes toward each other, whereby the second adjacent ends of the brake shoes do not separate from the anchor block upon activation of said service brake actuator and do not separate from the anchor block upon activation of said parking brake actuator until an associated brake drum rotates.