The WVA 29228 is a standard air disc brake pad specification used in commercial truck and bus applications. But what goes into making a high-quality 29228 brake pad that meets ECE R90 standards? In this article, we walk through the complete manufacturing process from raw material to finished product.
| Parameter | Value |
|---|---|
| WVA Number | 29228 |
| Dimensions | 210.7 × 114 × 29.8 mm |
| Common Applications | BPW trailer axles |
| Brake Type | Air Disc Brake |
| Certification | ECE R90, IATF 16949 |
Every 29228 brake pad starts with carefully selected raw materials. Our formulation contains:
Each material batch is inspected and tested before entering production. We maintain traceability from raw material lot to finished product.
Materials are weighed to precise tolerances (±0.1%) and mixed in a high-speed Eirich mixer. The mixing process takes 8-12 minutes, ensuring uniform distribution of every ingredient. This is critical — even slight variations in mixing can change the friction performance of the finished 29228 pad.
The steel backplate for 29228 pads goes through shot blasting to remove rust and oil, then is coated with adhesive primer. The backplate must be perfectly flat and clean to ensure the friction material bonds strongly and does not delaminate under braking heat.
This is the heart of the process. The mixed friction material is loaded into a precision mold sized for WVA 29228, the backplate is placed on top, and the press applies:
During pressing, the phenolic resin cures and forms a rigid composite. Multiple vents release trapped gases to prevent blistering.
Freshly pressed 29228 pads go into a programmed curing oven for 8-12 hours. The temperature ramps up gradually, holds, then cools slowly. This step completes the resin cure, removes residual stresses, and stabilizes the friction material for consistent performance.
After curing, the pad surface is precision ground to exact thickness and flatness. Chamfers and slots are machined according to the 29228 specification — these features reduce brake noise (squeal) and improve heat dissipation.
For 29228 applications, we attach noise-dampening shims (multilayer steel-rubber) to the back. Hardware kits (clips, springs) are available as a complete set for easy installation.
Every batch of WVA 29228 pads goes through:
Only batches that pass all tests get the E-mark stamped and are approved for shipment.
Direct factory pricing, ECE R90 certified quality, full traceability from raw material to finished product.