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Dongfeng Tianjin / Dongfeng Cummins Rear Spring Brake Chamber Assembly 3530N-015
Core Functions (Dual-Chamber Spring Brake System)
1. Service Braking (Pneumatic Service Brake): During normal driving, when the brake pedal is pressed, compressed air enters the chamber to actuate the pushrod, enabling routine deceleration and braking.
2. Parking and Emergency Braking (High-Force Spring Brake): When the brake is not applied, the parking brake is engaged, or system air pressure is completely lost due to a leak, a powerful internal spring (energy-storage spring) instantly releases to lock the wheels firmly. This serves as the critical safety mechanism that prevents the vehicle from moving when air pressure is insufficient and ensures the parking brake remains locked.
Troubleshooting Guide for Spring Brake Chamber (3530N-015)
| Symptoms | Root Cause | Diagnosis & Troubleshooting |
|---|---|---|
| Rear right wheel fails to lock when handbrake is engaged (Vehicle rolling) | Power spring broken or mechanically seized. | In a safe environment, engage the handbrake and check if the brake slack adjuster on the rear right axle moves. If there is no movement, the power spring is broken, and the entire brake chamber must be replaced immediately. |
| Rear right wheel dragging or overheating after launch | Weak return spring or pushrod binding. | When the brake pedal is released, the pushrod fails to retract quickly. This causes the brake shoes to continuously rub against the brake drum, generating extreme heat. Check the return spring inside the chamber or check if the slack adjuster is rusted/stuck. |
| Continuous hissing air leak sound heard | Internal rubber diaphragm ruptured or clamp band loose. | Spray soapy water around the middle clamp band and the dual air line fittings. If air leaks only when pressing the brakes, the service diaphragm is ruptured. If it leaks when pulling the handbrake, the parking diaphragm is ruptured. Air leaks will drop system pressure and cause vehicle wheel lockup. |
Bill of Materials (BOM) for Spring Brake Chamber Repair & Replacement
| No. | Part Number | Part Name (EN) | Qty | Replacement Status | Technical Notes / Function & Standards |
|---|---|---|---|---|---|
| 1 | 3530N-015 | Rear Axle Spring Brake Chamber (Right) | 1 pc | Core Part | Standard T30/24 dual-chamber type with heavy-duty power spring; directional (Right side only). |
| 2 | Q40316 / Q340B16 (Ref) | Mounting Bracket Lock Nut & Washer Kit | 2 sets | Mandatory Replace | Typically M16 size; highly prone to rusting due to exposure under the chassis. Never reuse old nuts. |
| 3 | 3530N-022 (Ref) | Clevis Pin & Cotter Pin Kit | 1 set | Mandatory Replace | Connects the chamber pushrod to the slack adjuster. The old pin wears out under shear force; cotter pin must be new. |
| 4 | 90003961102 (Ref) | Air Line Quick-Connect Seals (O-Rings) | 2 pcs | Mandatory Replace | Installed on both service and parking brake air line inlets to prevent pressure micro-leakage. |
| 5 | 3502100-EQ153 (Ref) | Brake Slack Adjuster Assembly | 1 pc | Inspect & Replace | Recommended to check if the internal worm gear is loose or seized; replace if necessary. |
| 6 | Consumable (N/A) | Medium-Strength Threadlocker (e.g., Loctite 243) | 1 tube | Essential Tool | Applied to the M16 mounting nut threads to prevent loosening from high-frequency heavy-duty vibrations. |
| 7 | Consumable (N/A) | Molybdenum Disulfide Brake Grease | Small Qty | Essential Tool | Applied to the clevis pin and slack adjuster joints to prevent premature wear, binding, and rust. |
DETAILS
| DESCRIPTION | Rear Spring Brake Chamber Assembly | PART NUMBER | 3530N-015 |
| WEIGHT | 10kg | VOLUME | 380 mm × 240 mm × 240 mm |
| TRUCK MOLDE | DONGFENG | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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