The antilock system may swell due to exposure of the internal piston to high concentrations of fluid contaminants. This may cause the piston to stick in the valve, which fails to comply with federal motor vehicle safety standard no. 121, "air brake systems".
The remedy
The dealer will replace the existing equipment to prevent failure, without charge.
Vehicle category: heavy tractors and trucks.system: service brakes; eaton antilock system, model no. 21.Consequences of defect: the brakes on the affected axle will cease to functionwithout warning; this could result in loss of vehicle control and a vehicleaccident.note: the chances of the problem occurring will be reduced if owner follows themaintenance practice of draining all fluids from the brake system daily ortemporarily disconnecting the antilock system until a permanent remedy can becompleted.