Brake Chamber GT-30/30L
GBCT3030LS
In Stock: 276
Cross-Reference — This Part Replaces
GBK GT-30/30L is a direct replacement for the following OEM and aftermarket part numbers:
| Brand | Part Number |
|---|---|
| Bendix | NT3030ELS-WC |
| Aftermarket Ref. | NT3030ELS80 |
| Haldex | GC3030L |
| Aftermarket Ref. | GC3030LCW |
| Aftermarket Ref. | LC3030L |
| Automann | 179.SB3030SL |
| MGM | 3230951 |
| Aftermarket Ref. | 3230051 |
| World American | WA3030TL |
| Aftermarket Ref. | Industry T30/30DD-L |
| Bendix | NT3030ELS80 |
| Haldex | GC3030LCW |
Product Specifications
| Material | Gold Powder-Coated Steel |
|---|---|
| Chamber Type | Type 30/30 Combination (Long Stroke) |
| Stroke | 3.0" Long |
| Push Rod Length | 13" |
| Push Rod Thread | 5/8"-18 UNF |
| Clevis | Detachable Threaded Clevis (Non-Welded) |
| Stud Thread | 5/8"-11 UNC |
| Bolt Spacing | 4.75" |
| Air Port | 3/8" NPT, Square |
| Mounting Holes | 2 |
| Net Weight | 33.07 lbs |
| Gross Weight | 35.27 lbs |
- Type 30/30 Long-Stroke Combination: Double-diaphragm piggyback — Type 30 service brake plus Type 30 spring brake; 3" long stroke for extended-travel S-cam drum systems.
- Square Air Ports: Long-stroke casting with square air-port bosses (3/8" NPT) — visually distinct from the round-port regular-stroke GT-30/30.
- 13" Extended Threaded Push Rod: Extra-long 13" fully threaded push rod (5/8"-18 UNF) for deep-set axles; non-welded detachable clevis allows on-site cut-to-length customization; includes caging T-bolt.
- Sealed & FMVSS-121 Compliant: Factory tamper-resistant sealed housing; gold powder-coated corrosion-resistant finish; double-diaphragm unit fully complies with FMVSS-121.
- Universal Fit: Direct replacement for Class 6-8 semi trucks and trailers; 5/8"-11 UNC mounting studs, 4.75" bolt center spacing.
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.



