Patent ID: 7178881

Claim:
A method for controlling a rear brake hydraulic circuit having a fluid storage element and a master cylinder supplying a volume of pressurized brake fluid to the rear brakes during the braking cycle in a pump-less anti-lock brake apparatus controlling the rotational speeds, during a braking cycle, of only the rear brakes of a vehicle having at least one front wheel, at least one rear wheel, and front and rear brakes acting on the front and rear wheels respectively, the method comprising: determining whether the vehicle is operating lightly loaded at a light vehicle weight (LVW) or heavily loaded at a gross vehicle weight (GVW) as a function of the rotational speed of at least one rear wheel and the rear brake pressure; providing rear dynamic proportioning (RDP) when a predetermined deceleration rate is exceeded during the braking event with the vehicle operating at LVW; monitoring rear brake pressure; and determining a rear brake pressure rate (RBP Rate) from the rear brake pressure; inhibiting RDP when the RBP rate is less than a predetermined value; and inhibiting RDP when the vehicle is operating at GVW.