PAT-20 GBK Type 20 Service Brake Chamber, 2.25″ Standard Stroke with Threaded Push Rod and Clevis Kit, Black Powder-Coated for Heavy Duty Semi Trucks and Trailers
GBK PAT-20 Type 20 service brake chamber, 2.25″ standard stroke, threaded push rod (5/8″-18 UNF), clevis with two pin holes and mounting hardware included, black powder-coated steel housing. For drive and trailer axles on Class 6-8 semi trucks. Direct replacement for Bendix 800824, Haldex SC20, Meritor E-20S. Sold per piece (4-piece minimum order).
Product Specifications
| Stroke | 2.25" |
|---|---|
| Push Rod Length | 8.7" |
| Material | Black Powder-Coated Steel |
| Clevis | Clevis with Two Pin Holes |
| Mounting Holes | 2 |
| Bolt Spacing | 4.75" |
| Push Rod Thread | 5/8"-18 UNF |
| Stud Thread | 5/8"-11 UNC |
| Air Port | 3/8" NPT |
Packaging: Sold per piece. Packed 4 pieces per box. 50 pcs/pallet.
- Universal Fit & Compatibility: High-performance Type 20 (T20) service brake chamber designed for S-Cam air brake systems. Direct replacement for Class 8 semi trucks and trailers, fitting Freightliner, Kenworth, Peterbilt, Mack, Volvo, and International.
- 2.25" Standard Stroke: This chamber features a 2.25-inch standard stroke (57mm), engineered to meet or exceed FMCSA and DOT brake performance requirements for S-Cam drum brake applications.
- 8.7" Threaded Push Rod: Equipped with an 8.7-inch threaded push rod (5/8"-18 UNF thread) and a clevis with two pin holes. Easy installation and slack adjuster alignment.
- Cross Reference Models: Directly replaces Bendix 800824, Haldex SC20, Meritor E-20S, MGM 1420001, Automann 179.SC20, Velvac 030016, and OEM aftermarket 20SC.
- Heavy-Duty Construction: Built with a reinforced, corrosion-resistant heavy-gauge steel housing and a premium-grade diaphragm for longer service life. Includes mounting hardware with 4.75" bolt centers (5/8"-11 UNC bolts) and 3/8" NPT air ports.
Reliable Braking Performance for Heavy-Duty Fleets
The GBK PAT-20 is a professional-grade Type 20 service brake chamber, engineered for the demanding conditions of long-haul trucking. Whether you are replacing a worn-out unit on a steer axle or upgrading a trailer system, this chamber delivers the precise mechanical force needed for controlled, safe stops.
Technical Specifications: Type: T20 Service Chamber | Stroke: 2.25" Standard (57mm) | Push Rod: 8.7" Threaded (5/8"-18 UNF) | Mounting Studs: 5/8"-11 UNC, 4.75" bolt spacing | Air Port: 3/8" NPT × 2 | Diaphragm Ø: 7" (178mm) | Includes: Clevis, Cotter Pin, and Mounting Nuts
Packaging & Delivery
Every GBK Parts order is packed with care. Pallet orders are tightly shrink-wrapped and strapped for safe freight transit. Select products also come in individual branded GBK USA retail boxes — ready for resale or direct customer delivery.
About GBK Parts
GBK Parts is a U.S.-based wholesale and retail distributor of heavy-duty commercial truck parts, headquartered in New Jersey. We specialize in brake components, axle parts, and drivetrain hardware for Class 6–8 trucks, trailers, and commercial vehicles.
We source directly from certified OEM-grade manufacturers and maintain a large inventory in our New Jersey warehouse, enabling fast fulfillment for both retail and wholesale customers across the United States.
Why Choose GBK Parts?
- Direct Wholesale Pricing — Competitive pricing with volume discounts for approved B2B accounts.
- OEM-Grade Quality — All parts meet or exceed OEM specifications. Brake components are FMSI-coded and tested to FMVSS standards.
- Fast Shipping — Same-day or next-day shipping on in-stock items. Free UPS Ground shipping on orders over $5,000 to NJ, NY, PA, OH, and MN.
- Catalog-Based Production — Extensive product catalog covering a wide range of heavy-duty truck and trailer parts, available to order.
- NET 15 Terms — Approved wholesale accounts are eligible for NET 15 payment terms.