Lamborghini Urus ceramic brake system brake discs

In 2026, the Carbon Ceramic Brake (CCB) system on the Lamborghini Urus remains a benchmark for high-performance SUVs. Because the Urus is a heavy vehicle ($2.2\text{ tons}+$) capable of nearly $200\text{ mph}$, these discs are engineered to handle immense thermal loads without fading.

1. Technical Specifications & Sizes

The Urus features the largest braking system ever fitted to a production car at its launch.

• Front Discs: 440mm x 40mm * Part Number: 4ML615301 (Suffixes vary by revision, e.g., 4ML615301G).

  • Calipers: 10-piston aluminum monoblock.

• Rear Discs: 370mm x 30mm

  • Part Number: 4ML615601.

  • Calipers: 6-piston (integrated electronic parking brake).

2. 2026 Market Pricing (Per Disc)

Pricing for these components is exceptionally high due to the complex chemical vapor infiltration (CVI) process used to create the silicon carbide structure.

3. Wear Measurement & Maintenance

Unlike steel discs, which are measured by thickness, ceramic discs are primarily monitored by mass (weight) and surface density.

• Minimum Weight (Min. Wt.): Every disc has a unique minimum weight (in grams) engraved on the aluminum hub. Once the disc loses enough density through oxidation (even if it still looks “thick”), it must be replaced.

• Visual Indicators: Look for “Pitting” (small dark spots) or a rough, “sandpaper” texture on the surface. If the surface becomes overly porous, the structural integrity is compromised.

• The “Edge” Test: Ceramic is brittle. If a technician accidentally hits the disc with a wheel during a tire change, the edge can chip. A chipped edge is an automatic failure and requires a full replacement for safety.

   

4. Cost-Saving Solutions in 2026

• Refurbishment: Companies like ReBrake (Europe) or specialized US labs can now re-coat and re-infuse worn Urus discs. This typically costs $1,500 – $2,200 per disc and can return the disc to near-new performance levels.

• Iron Conversion Kits: For owners who frequently track their Urus or drive in extreme winter conditions, “Iron Conversion” kits (e.g., from GiroDisc) allow you to swap to steel rotors. These are significantly cheaper ($3,000 for a full set) but increase unsprung weight and brake dust.