📌 Product Overview
The Heart of Your Air Brake System.
The diaphragm is the critical moving part inside every air brake chamber. It converts compressed air into the mechanical force needed to stop a 40-ton truck. A failed diaphragm means failed brakes. Victory Technology’s Heavy Duty Rubber Brake Diaphragms are engineered to survive the toughest conditions, ensuring reliable stopping power every time the pedal is pressed.
Manufactured in our Zhuji Aoke facility, our diaphragms are molded from premium EPDM/NBR Rubber blends. They offer exceptional elasticity and resistance to oil, ozone, and extreme temperature fluctuations (-40°C to +120°C). Whether for a standard service chamber or a heavy-duty spring brake, our diaphragms are tested to exceed 1 million flex cycles, guaranteeing long service life and DOT compliance.
🔹 Why Choose Victory Brake Diaphragms?
- ✅ Premium EPDM/NBR Construction:Cheap rubber cracks in winter. Ours doesn’t. We use a high-grade synthetic rubber formula that stays flexible in freezing arctic cold and resists hardening in the intense heat of braking friction.
- ✅ Reinforced Fabric Mesh:Built for pressure. The rubber is reinforced with a high-tensile fabric mesh (nylon) embedded within the mold. This prevents the diaphragm from ballooning or tearing under high air pressure (up to 10 Bar).
- ✅ Perfect OEM Fit (Type 9 – Type 36):No leaks allowed. Our molds are precision-engineered to match standard industry sizes (Type 20, 24, 30 being the most common). The Reinforced Beaded Rim ensures an airtight seal against the steel housing clamping ring.
- ✅ High Cycle Life (>1,000,000 Cycles):Tested for endurance. Our diaphragms undergo rigorous lab testing to ensure they can withstand over a million applications without fatigue cracking, meeting SAE J1469 standards.
🔸 Technical Specifications
Engineered for SAE J1469 Standards.
| Feature | Specification |
| Product Name | Rubber Brake Diaphragm (Air Chamber Membrane) |
| Material | EPDM / NBR + Nylon Fabric Reinforcement |
| Common Sizes | Type 20, Type 24, Type 30 (Standard & Long Stroke) |
| Other Sizes | Type 9, 12, 16, 36 |
| Temp Range | -40°C to +120°C (-40°F to +248°F) |
| Working Pressure | Up to 10 Bar (145 PSI) |
| Cycle Life | > 1,000,000 Cycles |
| Standard | Meets FMVSS 121 / SAE J1469 |
🔹 Applications
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Service Brake Chambers: The front section of Type 30/30 or standard Type 20/24 chambers.
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Spring Brake Chambers: The rear section (emergency side) sealing.
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Remanufacturing: Essential component for rebuilding used brake chambers.
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Fleet Maintenance: Routine replacement during annual brake inspections.
❓ Frequently Asked Questions (FAQ)
Q: How do I know which size I need?
A: The “Type” number usually refers to the effective area in square inches.
Type 30: Approx 8 inches (203mm) Outer Diameter. (Most common for trailers).
Type 24: Approx 7 inches (178mm) Outer Diameter.
Type 20: Approx 6.5 inches (165mm) Outer Diameter.
Q: Is this for standard or long stroke?
A: We offer both. Standard Stroke diaphragms are shallower, while Long Stroke diaphragms (often marked with a trapezoid tag on the chamber) have a deeper profile to allow for more push-rod travel. Please specify when ordering.
Q: What is the shelf life?
A: When stored in a cool, dark place away from direct sunlight (UV), our EPDM diaphragms have a shelf life of 3-5 years.
📦 Factory Direct Packaging (B2B)
Victory Technology offers bulk packing optimized for high-volume users:
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Bulk Carton: 20–50 pcs per carton (nested to save space).
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Protection: Strong export-grade kraft carton to prevent crushing.
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Labeling: Clear label with Type Size (e.g., “Type 30”) and Batch Number.
🚀 Get a Factory Price Quote Now
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