Mack CHN Brake problems by year

On certain trucks equipped with parker single check valves (scv) provided by bendix. The defect exists in the parker scv that connects with the supply port of the sr-7 spring brake modulating valve. After prolonged use of the parker scv, the valve body...

On certain trucks equipped with bendix sr-7 spring brake modulating valves, the internal rubber check valve may leak causing a delay in the application of the spring brakes to park the vehicle after the operator pulls the dash valve button.

On certain trucks, the brake cam tubes on the steer and drive axles may not have been greased.

On certain trucks equipped with a legris air manifold, the brass push-to-connect cartridge may unexpectedly separate from the plastic housing.

On certain trucks equipped with sr-7 bendix brake valves, the check valve inside the valve cavity may not properly set, causing internal air leakage. If the check valve does not properly seat, the resulting leakage can cause a delay in the application of the...

On certain vehicles, the brake cam tubes on the steer and drive axles may not have been greased.

On certain vehicles, the brake cam tubes on the steer and drive axles may not have been greased.

On certain vehicles. The brake cam tubes on the drive axle may not have been greased.

On certain vehicles, the brake cam tubes on the steer axle may not have been greased.

On certain heavy duty class 8 trucks equipped with air suspension proprietary axles and adjustable lengh torque rods, an interference between the adjustable torque rod and the brake chamber on the left side of the chassis may exist. The spring brake chamber...