Hyundai i30 Brake Discs: Specs, Fitment & Wear Symptoms
On the i30, "warping" is genuinely often a widespread Hyundai/Kia design issue where pads get stuck in the caliper bracket.
Illustration for editorial purposes
OEM Part Numbers
| i30N (2017 onwards), front disc, genuine reference | Hyundai OEM: 51712-S0100 — 345mm diameter, vented, 30mm thickness, 28mm minimum |
|---|---|
| i30N, rear discs | 314mm diameter, vented, 20mm thickness, 18mm minimum |
| Standard trims (2013 onwards), front discs | 280mm or 300mm diameter, vented, depending on engine |
| Standard trims, rear discs | 262mm diameter, solid, 10mm thickness, 8mm minimum |
A Genuinely Detailed, Real Root Cause Worth Knowing About "Warping"
If you've been told your discs have "warped" and are experiencing recurring vibration, this is genuinely worth knowing: this has been documented as a widespread design issue affecting Hyundai and Kia models broadly, where the brake pads themselves can get stuck inside the caliper bracket rather than moving freely. This causes uneven contact between pad and disc, producing vibration typically blamed on a "warped" disc. A documented fix: lightly grinding down the small tabs on the back of the pad and applying appropriate brake grease allows the pad to move more freely.
It's also worth knowing that rear discs commonly corrode more than the fronts on many cars simply because the rear brakes experience less pressure during normal driving.
The Part That Pads Depend On
Discs and pads work as a pair, and neglecting one tends to accelerate wear on the other — which is exactly why worn discs so often get discovered during what was meant to be a routine pad change.
What They Do
Brake discs provide the surface the brake pads clamp against to slow the car, converting momentum into heat through friction. Larger, sportier trims of the i30 typically use bigger discs than standard versions to handle the additional heat generated by more aggressive braking.
Fitment & Compatibility
Disc size and specification vary by trim and braking package on the i30. Always confirm the exact disc size and design fitted to your specific trim before ordering. Whether you're sourcing a replacement brake discs for your Hyundai i30 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.
Common Wear Symptoms
- Vibration or pulsing through the brake pedal — often a sign of warped discs, usually from excessive heat build-up.
- Visible grooves or scoring on the disc surface — indicates the pads have worn down to metal and are cutting into the disc itself.
- Squealing that persists even with new pads — can point to a rough or glazed disc surface needing replacement.
- Longer stopping distances despite good pads — worn or warped discs reduce effective braking surface contact.
DIY Replacement Difficulty
This is a moderate DIY job for someone comfortable with basic tools and a jack, typically done alongside a pad replacement since the caliper needs removing either way. Rear discs on cars with an electronic parking brake may need a specific tool or diagnostic device to retract the caliper. Expect 45–90 minutes per side including pads.
OEM vs. Aftermarket
Reputable aftermarket brake discs are widely regarded as safe and effective, provided they carry proper certification and match the correct size and design for your trim. As with pads, this is a part worth not cutting corners on — budget unbranded discs are a common source of premature warping and noise complaints.
More Hyundai Brake Discs Guides
The same part, covered across other Hyundai models.