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Precision and reliability in a truck’s braking system are achieved through the harmonious function of both primary and secondary components. As a dedicated supplier of high-quality Foton truck parts, we present the essential Retracting Spring, identified by the precise OEM part number 880440012. This specific spring variant is engineered for certain FOTON truck models, providing the calibrated tension necessary to actively retract the brake shoes from the drum after each braking application. The reliable operation of spring 880440012 is critical for preventing brake drag, reducing unnecessary friction and wear, and ensuring optimal vehicle performance and fuel efficiency.
Retracting Spring (English)
Возвратная пружина тормозной колодки (Russian)
Resorte de Retracción de Freno (Spanish)
The Retracting Spring, part number 880440012, performs a vital, active function within the drum brake assembly. When the driver releases the brake pedal, hydraulic pressure in the wheel cylinder drops. The stored energy in this spring immediately acts to pull the brake shoes away from the rotating drum.
This action re-establishes a precise and consistent clearance, known as running clearance, between the friction lining and the drum’s inner surface. This clearance, maintained by spring 880440012, is what allows the wheel to rotate freely when braking is not required, eliminating constant friction that leads to drag, heat buildup, and premature wear.
Without a properly functioning spring of the correct specification, brake shoes can remain partially applied due to residual pressure, mechanical resistance, or minor corrosion. This condition silently increases operating costs and compromises safety by reducing braking system efficiency and causing overheating.
The 880440012 component is a helical tension spring, a design chosen for its efficient energy storage and linear force characteristics. Key design parameters include the wire diameter, mean coil diameter, number of active coils, and free length.
These parameters are meticulously defined by FOTON engineers to produce the exact return force required. The spring material is typically a high-grade spring steel (such as SAE 1060-1090), which undergoes specific heat treatment processes like quenching and tempering to achieve the desired balance of strength and flexibility.
The end hooks are formed to specific geometries to ensure secure engagement with the brake shoe and the fixed anchor pin on the backing plate. This precise design of part 880440012 ensures reliable operation and a long service life in the demanding brake environment.
A compromised retracting spring, such as a stretched, fatigued, or broken 880440012, leads directly to the condition of brake drag. The symptoms are both noticeable and costly for truck operators.
The vehicle will exhibit reduced performance and noticeably higher fuel consumption as the engine works harder to overcome the constant braking force. The affected wheel hub will become excessively hot to the touch, even after normal driving.
Prolonged drag causes rapid and uneven wear of the brake linings, can score or overheat the brake drum leading to thermal cracking, and places additional stress on wheel bearings. In severe cases, the excessive heat can pose a fire risk. Therefore, the spring, part number 880440012, is a critical safety-related wear item.
The table below provides detailed technical data for the genuine FOTON Retracting Spring. This information is essential for correct part identification and technical understanding.
| Parameter | Specification | Details / Notes |
|---|---|---|
| OEM Part Number | 880440012 | Official FOTON Identification |
| Product Name | Retracting Spring | Brake Shoe Return Spring |
| Brand | FOTON | Original Equipment Manufacturer |
| Spring Type | Helical Tension Spring | With closed and ground ends |
| Core Material | High-Carbon Spring Steel | Heat-treated for durability |
| Surface Finish | Zinc Plated | For corrosion protection |
| Application | Drum Brake Assembly | Specific FOTON truck models |
| Primary Function | Active Shoe Retraction | Prevents drag, ensures clearance |
Replacing the retracting spring 880440012 is a standard procedure during brake relining. The vehicle must be securely lifted and supported on jack stands. The wheel and brake drum are removed to access the brake shoe assembly.
Specialized brake spring pliers are essential for safe and efficient removal of the old spring and installation of the new one. This prevents injury and ensures the new spring, part 880440012, is correctly seated. The spring hooks must fully engage the designated holes in the brake shoe and the anchor pin on the backing plate.
It is crucial to clean the anchor pin and the contact points on the brake shoe. A light application of high-temperature brake grease to these points ensures smooth operation and prevents premature wear or binding. Springs should be replaced in axle sets (both sides) to maintain balanced brake function across the vehicle.
Regular inspection of the retracting spring 880440012 can prevent unexpected brake issues and associated costs.
Visual Inspection: During brake service, examine the spring for signs of heavy corrosion, rust scaling, reduced coil diameter, or deformed hooks. Compare its length and tension with a new spring.
Functional Test: With the drum removed, manually apply and release the brake (using the adjuster or wedge). Observe if both shoes retract quickly and evenly. A sluggish return is a clear sign of a weak spring or binding hardware.
Symptom-Based Diagnosis: Driver reports of decreased fuel mileage, a burning smell from a wheel, or excessive hub heat are classic indicators of brake drag, which should prompt an immediate inspection of the springs, including part 880440012.
Preventive Replacement Schedule: As a component with a finite fatigue life, consider replacing all retracting springs as part of a comprehensive brake overhaul or every second lining change. This proactive approach ensures consistent performance and safety.
The 880440012 spring is designed for specific FOTON truck models and their corresponding brake assemblies. Using the exact OEM part number is non-negotiable for proper function.
A spring with incorrect tension or physical dimensions can lead to poor retraction (causing drag) or over-retraction (potentially affecting shoe alignment). Always verify compatibility using the vehicle’s VIN or a trusted parts catalog to ensure part 880440012 is the correct fit for your truck.
The spring is a matched component to the brake shoe design and weight. Using the genuine part guarantees that the brake system operates as originally engineered, maintaining safety, performance, and component longevity.
The material quality and manufacturing precision of the 880440012 spring are vital. Genuine FOTON parts use certified spring steel with consistent metallurgical properties and precise heat treatment, ensuring predictable performance and fatigue life.
Aftermarket springs may use inferior materials or have inconsistent tension ratings. A spring that is too weak will not prevent drag; one that is too strong can stress other brake components. The genuine part, 880440012, is validated to meet all original specifications for force, dimensions, and durability.
For fleet maintenance and safety-critical repairs, the minimal cost saving of an aftermarket spring is not worth the risk of premature failure or suboptimal brake performance. The OEM part provides guaranteed reliability.
If brake drag is suspected, a systematic approach can identify if the 880440012 spring is at fault. After safely lifting the vehicle, spin the affected wheel by hand. A dragging brake will offer significant resistance.
Remove the wheel and drum. If the shoes are not fully retracted, manually operate the spring. A spring that feels slack or can be easily stretched compared to a new one is likely faulty. Also, check for binding of the shoes on the backing plate due to rust or lack of lubrication, which can mimic a weak spring.
Always inspect all related hardware (pins, hold-downs, adjusters) when diagnosing return issues. A comprehensive inspection ensures the root cause is found and corrected, restoring the brake system to full function with the correct part, 880440012.
The Retracting Spring, OEM part 880440012, is a small but indispensable guardian of brake system efficiency and safety. Its role in ensuring complete disengagement of the brakes is fundamental to vehicle performance, fuel economy, and the prevention of costly secondary damage.
Choosing the genuine FOTON part guarantees the precise engineering, material quality, and reliable performance that your truck’s braking system requires. It is a simple yet critical investment in the longevity of your brake components and the overall safety of your vehicle.
Do not underestimate the importance of this component. For all your brake maintenance and repair needs, insist on the authentic 880440012 Retracting Spring. Explore our complete range of genuine FOTON brake system parts to maintain your fleet’s reliability, safety, and operational efficiency at the highest level.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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