4156001 Meritor Caliper Tappet and Dust Boot

What does a caliper tappet and dust boot do?

This brake caliper tappet and dust boot is a critical component within the pneumatic air disc brake system. It serves to protect the internal piston or pushrod mechanism from contaminants while ensuring smooth, unobstructed movement during braking cycles. Built with high-strength components, it is designed to maintain structural integrity under extreme thermal and mechanical stress common in heavy commercial vehicle operations.

Compatible vehicles and systems

This specific part is compatible with Meritor systems and is fitted to Renault Trucks, Scania, and Volvo heavy commercial vehicles. It ensures the braking mechanism operates according to original equipment standards, preventing air leaks and debris ingress that could lead to premature wear of the internal caliper components.

Installation and maintenance

For professional workshop technicians, it is recommended to inspect these components during every scheduled brake service or pad replacement. Ensuring the boot is free from cracks or ozone degradation is vital for maintaining system pressure. When installing, verify that the pushrod diameter matches the boot's inner collar dimensions to ensure a perfect seal.

Troubleshooting and inspection

Maintaining the integrity of the dust boot helps prevent moisture and road grit from entering the caliper body, which protects the internal seals from abrasive damage.

OE cross-reference

4156001 (Brake Caliper Tappet and Dust Boot) is the equivalent of the Meritor, Renault Trucks, Scania and Volvo OE numbers. This part directly replaces Meritor OE number MCK1309. It also replaces Renault Trucks OE number 5001866398, Scania OE number 2272699 and Volvo OE number 85109891.