High Quality GG20HC Painted/Coated Auto Spare Parts Ventilated Brake Disc(Rotor) with ECE R90

• Being a world leading professional brake parts manufacturer, Winhere produces more than 55 million units of brake discs and 10 million sets of brake pads annually for OEM and IAM. 

• 96%+ car parc coverage of brake discs and brake pads from A to Z for both passenger cars and commercial vehicles. 

• IATF16949, ISO14001, ISO45001, ECE R90, CNAS certificated. 

• National Green Manufacturer and China’s Champion Enterprise awarded by M.I.I.T. and C.F.I.E. 

• National Standard of “Brake Disc for Automobile” GB/T 34422-2017 is led by National Quality Supervision and Inspection Center for automobile parts, Winhere is the responsible drafting company for this national standard.

Key Features

1. Unified base blank for performance variants

   This standard vented rotor serves as the base substrate for our slotted, drilled‑slotted and coated vented rotors. It shares identical casting formula, stress‑relief annealing and dynamic‑balance standards. All secondary processing including slotting, drilling and anti‑rust coating is performed on pre‑qualified rotors. This avoids the common industry flaw where performance‑grade discs use downgraded base material.

2. Intact friction surface reduces extra pad wear

   The continuous unbroken friction surface does not cut or abrade brake pads. Unlike drilled or slotted rotors, it works perfectly with stock OE‑spec brake pads. End‑users face lower recurring consumable costs, and repair shops benefit from simpler part compatibility.

3. Balanced thermal‑stress distribution, lower spontaneous cracking risk

   Without drilled holes creating stress‑concentration notches, thermal stress releases evenly across the disc body during repeated heating‑cooling cycles. Under city stop‑go traffic and mild mountain‑road downhill conditions, the risk of crack initiation is greatly improved, delivering superior long‑term structural reliability.

4. Inherent NVH advantages for passenger‑vehicle requirements

   Smooth unmodified friction surface eliminates airflow disturbance and local high‑frequency vibration caused by slots or holes. It matches the original noise‑reduction calibration of family cars, lowering brake‑squeal complaints and aftermarket rework rates for garages.

5. Inventory‑friendly universal design for supply‑chain circulation

   Proven standard construction fits most original calipers, dust shields and wheel hubs with zero modification or‑interference risks. Without slots and holes, friction surfaces are less vulnerable to dents and dirt accumulation during storage and container shipment, cutting logistics‑related damage rates.

6. Straightforward wear inspection for technicians

   On a plain smooth surface, wear grooves, scoring and heat discoloration are easy to observe visually. Mechanics can reliably assess remaining service life and replacement timing. Holes and slots on performance rotors often obscure true wear status.

Additional perspectives 

Process perspective

• One‑piece cast vent vanes with no welded or assembled joints, eliminating the risk of internal vane fracture. Internal vane cavities are fully deburred to remove casting sand residue, preventing abrasive particles from scratching friction surfaces under high temperature.

• Complete stress‑relief annealing removes residual casting stress, rather than relying purely on machining flatness. This minimises in‑service warping after installation.

• 100% critical dimensions, runout and DTV inspection 

• Material physical and chemical inspection

• Test shear strength, compressibility, density, flatness and parallelism 

• Test performance and noise/NVH