12.25 Trailer hydraulic Brake

Premium hydraulic uni-servo forward self-adjust brake assembly (12.25"×3.375") engineered for heavy-duty trailer axles. Automatic forward adjustment maintains optimal shoe clearance, reducing wear and improving braking efficiency. Rugged structure ensures durability under harsh road conditions.

Item	Specification
Brake Size	12.25" × 3.375" (Diameter × Width)
Brake Type	Hydraulic Drum Brake, Uni‑Servo
Adjustment	Forward Self‑Adjusting
Axle Capacity	8,000 lbs – 10,000 lbs
Mounting Flange	7‑Bolt Standard Flange
Application	Heavy‑Duty Trailers, Commercial Trailers
Brake Fluid	DOT 3 / DOT 4
Side	Left Hand (LH) / Right Hand (RH)
Construction	Heavy‑Duty Steel Backing Plate, High‑Friction Lining
Features	Stable Braking, Low Maintenance, Long Life
Installation	Bolt‑On, Standard Replacement

Material, Process & Production Flow

Main Materials：

Backing Plate: High-strength stamped steel / die-cast steel, high rigidity, anti-deformation
Brake Shoes: Stamped steel shoe frame + high-friction semi-metallic / non-asbestos friction lining
Wheel Cylinder: Cast iron body, rubber cup seal, corrosion-resistant, stable hydraulic performance
Spring Kit: Heat-treated steel springs, high fatigue resistance, long service life
Adjuster Mechanism: Forged steel components, precise self-adjust thread structure
Surface Treatment: Electrostatic painting / black electrophoresis for rust and corrosion protection

Key Processes：

Stamping & forming of backing plate and brake shoes
Precision machining of wheel cylinder bore
High-temperature hot-pressing bonding of friction lining
Heat treatment of elastic components and adjuster parts
Automatic riveting of shoe and lining
Overall electrophoresis / spray coating and curing
Torque calibration and pre-assembly of brake mechanism

Production Flow：

1. Raw material incoming inspection (steel, friction material, seals, springs)
2. Stamping forming → shaping → trimming of backing plate & shoe frame
3. Heat treatment & surface strengthening of mechanical parts
4. Friction lining hot pressing & riveting
5. Wheel cylinder machining, assembly & leakage testing

6. Assembly of brake shoe, spring, adjuster, wheel cylinder

7. Self-adjust mechanism function debugging

8. Overall electrophoresis / painting & drying

9. Full size inspection & performance test
10. Cleaning, packaging & warehousing

product-553-271

Quality Control & Customer Assurance

1. Rigorous Quality Control (QC) System：

We implement a comprehensive, three-stage QC protocol to guarantee exceptional quality for every unit:

Incoming Inspection: 100% inspection of raw materials (steel, friction materials, seals, etc.) based on IQC standards. Only materials that meet precise hardness and purity requirements are approved for production.
Process Control: Real-time monitoring during stamping, machining, and assembly. Critical dimensions are inspected via precision measuring instruments (e.g., coordinate measuring machines) to ensure strict adherence to OEM specifications.
Final Test: Each finished brake assembly undergoes a simulated braking performance test and a tightness test for the hydraulic system. Only products with zero defects and stable performance pass the final FQC inspection before packaging.

2. Durability & Reliability Assurance：

Material Durability: Our friction materials are formulated for high heat resistance and low wear, ensuring consistent braking performance even under extreme operating conditions.
Corrosion Protection: All metal parts receive a premium electrophoresis or electrostatic painting process, providing superior rust resistance to extend the service life of the product.
Precision Engineering: Tight tolerance assembly ensures smooth operation, reducing noise and vibration for a safer driving experience.

3.Customer Support & Warranty：

Warranty Policy: We offer a 12-month warranty from the date of shipment against manufacturing defects (e.g., brake failure due to material fatigue or hydraulic leaks).
Technical Support: Our professional team provides 24/7 technical support to assist with installation guidance, troubleshooting, and application matching.
After-Sales Service: In case of quality issues, we promise a quick response with a solution within 24 hours. We also provide flexible return and replacement policies to protect your business interests.

4.Certifications & Compliance：

Our production facilities hold ISO/TS 16949 and ISO 9001 certifications, confirming our adherence to international automotive quality standards. All products comply with CE, RoHS, and other relevant regional certifications, making them suitable for global markets.