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GT-30/30 GBK Type 30/30 Piggyback Spring Brake Chamber, 2.5″ Regular Stroke with Threaded Push Rod and Clevis Kit, Gold-Finish for Heavy Duty Semi Trucks and Trailers
GBK GT-30/30 gold-finish Type 30/30 combination spring brake chamber, 2.5″ regular stroke, extended 13″ fully threaded push rod (5/8″-18 UNF), non-welded detachable clevis kit (cut-to-length) and mounting hardware included, sealed tamper-resistant design with caging T-bolt, standard round air ports. For drive axles and trailer axles on Class 6-8 semi trucks.
In Stock: 67
Wholesale over $1,500 to NJ & NY
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- Defective-on-arrival parts replaced free — return policy
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Engineered to deliver elite mechanical stopping power and absolute emergency parking security, the GBK Type 30/30 Combination Spring Brake Chamber is the ultimate replacement for commercial semi-trucks and heavy-duty trailers. This premium assembly features an industry-compliant 2.5" Regular Stroke encased in a striking, corrosion-resistant Gold powder-coated finish with standard Round Air Ports, instantly signifying regular-stroke reliability to fleet mechanics and DOT inspectors. Specifically built to accommodate specialized trailer suspensions and deep-set axles, it comes equipped with an extra-extended 13" Universal 5/8"-18 Threaded Pushrod and a non-welded detachable clevis hardware kit, allowing technicians to seamlessly perform on-site cut-to-length customization for a flawless installation. Manufactured with a factory tamper-resistant sealed design to permanently lock down the high-tension emergency spring, each double-diaphragm unit fully complies with FMVSS-121 vehicle safety standards and includes a dedicated mechanical caging bolt (T-Bolt) for maximum servicing security.
- Type 30/30 Combination Design: Double-diaphragm piggyback assembly — Type 30 service brake (top) plus Type 30 spring brake (bottom) for service, parking, and emergency braking on S-Cam drum systems.
- 2.5" Regular Stroke: Standard regular-stroke configuration (T3030DD) — NOT a 3" long stroke. For the long-stroke version, see GT-30/30L. Round air ports and gold finish signify regular-stroke reliability.
- 13" Extended Threaded Push Rod: Extra-long 13" fully threaded push rod (5/8"-18 UNF) for deep-set axles and specialized trailer suspensions; non-welded detachable clevis kit allows on-site cut-to-length customization.
- FMVSS-121 Compliant & Sealed: Factory tamper-resistant sealed housing locks down the high-tension power spring and fully complies with FMVSS-121. Includes a mechanical caging bolt (T-Bolt) for safe servicing.
- Universal Fit: Direct replacement for Class 6-8 semi trucks and trailers — Freightliner, Kenworth, Peterbilt, Mack, Volvo, International. 5/8"-11 UNC mounting studs, 4.75" bolt center spacing.
Technical Specifications: Type: T30/30 Combination (Service + Spring) | Service Stroke: 2.5" Regular | Push Rod: 13" Threaded 5/8"-18 UNF | Clevis: Non-Welded Detachable (cut-to-length) | Mounting Studs: 5/8"-11 UNC, 4.75" bolt spacing | Air Port: Round, 3/8" NPT × 2 | Finish: Gold Powder-Coated | Includes: Clevis, Caging T-Bolt, Cotter Pin, and Mounting Nuts
Packaging: Sold per piece. Packed 4 pieces per box. 50 pcs/pallet.
Product Specifications
| Material | Gold Powder-Coated Steel |
|---|---|
| Stroke | 2.5" Regular |
| Push Rod Length | 13" |
| Clevis | Detachable Threaded Clevis (Non-Welded) |
| Mounting Holes | 2 |
| Air Port | 3/8" NPT, Round |
| Push Rod Thread | 5/8"-18 UNF |
| Net Weight | 39 lbs |
| Gross Weight | 20.94 lbs |
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 standard shipping on retail orders over $100, nationwide.
- 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.
1 review for GT-30/30 GBK Type 30/30 Piggyback Spring Brake Chamber, 2.5″ Regular Stroke with Threaded Push Rod and Clevis Kit, Gold-Finish for Heavy Duty Semi Trucks and Trailers
Only logged in customers who have purchased this product may leave a review.
Ray Bennett (verified owner) –
Feels well-built and stops the truck perfectly. Great quality.