6-piston brake system Stoptech ST60 Toyota Supra MK5 A90 GR
StopTech ST60 6-piston big brake kit (BBK) is a high-performance upgrade for the Toyota Supra MK5 (A90/A91), specifically designed for those who find the factory 4-piston Brembo setup insufficient for heavy track use or sustained high-speed driving.
1. System Specifications
The ST60 kit is known for its “balanced brake upgrade” philosophy, ensuring that the larger calipers don’t upset the factory ABS or EBD (Electronic Brakeforce Distribution) tuning.
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Caliper Type: 6-Piston, fully forged aluminum body for high stiffness and reduced weight.
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Piston Design: Differential-bore sizing (pistons are different diameters) to ensure even pad wear and prevent “tapering” during high-heat track sessions.
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Rotor Options: Typically paired with 355mm or 380mm two-piece AeroRotors®. These feature a patented internal vane design that acts as a centrifugal pump to pull cool air through the rotor.
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Finish: Usually available in Red, Black, or Silver Trophy (anodized) finishes.
2. Key Advantages over OEM
| Feature | OEM Brembo (4-Piston) | StopTech ST60 (6-Piston) |
| Clamping Force | Moderate; focused on street comfort. | Higher; more surface area for pad-to-rotor contact. |
| Thermal Capacity | Prone to fade after 3–4 hard laps. | Designed for continuous 20–30 minute track sessions. |
| Pad Selection | Limited to street/light track compounds. | Uses standard DR22/D1247 shapes (huge variety of racing compounds). |
| Brake Feel | Slightly soft under extreme heat. | High-stiffness forged body provides a firm, consistent pedal. |
3. Installation & Technical Requirements
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Wheel Clearance: This is the most critical factor. The ST60 caliper is significantly wider than the OEM Brembo.
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19″ Factory Wheels: Usually fit without spacers, but it is tight.
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18″ Track Wheels: Often require a specific offset or a 5mm spacer depending on the wheel’s barrel and spoke design.
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Bridge Bolt: The ST60 features a removable bridge bolt. This makes the caliper incredibly stiff, but you must remove it to swap pads (unlike some “open-top” racing calipers).
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Brake Lines: The kit usually includes stainless steel braided lines, which eliminate the expansion found in the Supra’s factory rubber lines, sharpening the initial “bite.”
4. Technical Tip: Bedding Procedure
When installing the ST60 system on a B58-powered Supra, it is vital to perform a proper bed-in procedure. This involves a series of high-speed stops (e.g., 60 mph to 10 mph) to transfer a layer of pad material onto the rotor surface. Without this, you may experience “judder” or vibration that feels like a warped rotor but is actually uneven pad deposition.
5. Recommended Pad Compounds
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Street/Sport: StopTech Sport (included) – Good for daily driving and occasional spirited canyon runs.
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Dedicated Track: Pagid RS29 or Endless ME20 – These are the gold standard for the Supra/BMW platform to handle the high temperatures generated by the 3,400-lb chassis.
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