Wagner Brake Z973 Parking Brake Shoe - Rear

Wagner Z973 Parking Brake Shoe

The Wagner Z973 parking brake shoe is built for rear drum parking brake applications that call for OE-matched friction and precise drum contact. It is a fitment-focused replacement for Chevrolet Express 3500 and GMC Savana 3500 models, with additional coverage for select GMC Sierra HD and Savana 3500 configurations.

Key Features

• OE-matched friction material for consistent parking brake performance
• Precision-ground construction to improve friction-to-drum contact
• 9.000-inch brake drum diameter
• 1.960-inch brake shoe width
• FMSI number 1640-S973; FMSI lining 1640 and steel S973
• Primary friction material thickness: 0.150
• Rear parking brake shoe for drum-style parking brake systems

Product Details

Wagner Brake Z973 is a rear parking brake shoe engineered around the dimensions and friction profile needed for specific GM full-size van and truck applications. The OE-matched friction material helps maintain predictable engagement, while the precision-ground surface supports even contact inside the drum. This part number is commonly searched for Chevrolet Express 3500 rear parking brake shoe and GMC Savana 3500 rear parking brake shoe replacement needs, as well as select GMC Sierra 2500 HD and Sierra 3500 HD rear applications.

This part cross-references GM OE numbers 20778485 and 23380398 for the same application. Wagner Z973 is the part number to reference when matching the correct rear parking brake shoe for the listed vehicles.

What It Helps Address

• Weak or inconsistent parking brake hold
• Parking brake shoe wear from drum contact
• Uneven braking feel in rear drum parking brake systems
• Noisy or rough parking brake engagement caused by worn friction surfaces
• Service replacement needs on GM Express, Savana, and Sierra rear parking brake assemblies

Fitment

• Fits 2021 Chevrolet Express 3500, rear.
• Fits 2018-2019 Chevrolet Express 3500, rear, with Dual Rear Wheels (DRW); Wagner.
• Fits 2008-2017 Chevrolet Express 3500, rear, Dual Rear Wheels; Wagner.
• Fits 2021 GMC Savana 3500, rear.
• Fits 2014-2019 GMC Savana 3500, rear, Except Vehicle Stability Control; Wagner.
• Fits 2011-2013 GMC Savana 3500, rear, Wagner.
• Fits 2009 GMC Savana 3500, rear, Wagner.
• Fits 2008 GMC Savana 3500, rear, Except 10000 (lb) GVW; Wagner.
• Fits 2011-2013 GMC Sierra 2500 HD, rear, Wagner.
• Fits 2011-2013 GMC Sierra 3500 HD, rear, Wagner.

Installation Notes

Confirm the 9.000-inch drum diameter, 1.960-inch shoe width, and FMSI 1640-S973 match the existing parking brake hardware before installation. Inspect the drum surface, backing plate contact points, and related parking brake components for wear before reassembly. For best results, replace shoes in axle pairs and verify proper adjustment after installation.

Quality Assurance

Wagner Brake uses OE-matched friction materials and precision-ground manufacturing methods to support consistent fit and braking contact. Part number Z973 is built to the listed dimensions and application data for accurate service replacement on the specified GM vehicles.