Mercedes-Benz GLS Big Brake Kit Upgrade / TTSPORT Classic 8657
Power and handling get all the attention, but stopping power is what actually keeps a 340-horsepower SUV in check. This Mercedes-Benz GLS wears the AMG appearance package and its 2.0T turbo engine, and the owner decided the factory brakes needed to catch up with the rest of the car — so it went in for a TTSPORT big brake kit.
The project: a full front brake upgrade on a 20-inch-wheeled Mercedes-Benz GLS. The owner went with the TT8657 forged six-piston caliper, a 405x34mm high-carbon heat-treated curved-slot rotor, and TTSPORT stainless steel brake lines — a one-step, no-half-measures swap over the stock setup.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Mercedes-Benz GLS (AMG package, 2.0T, 340 hp), 20-inch factory wheels |
| Front caliper | TTSPORT TT8657 two-piece forged aluminum six-piston caliper, custom tri-color finish, ~3.90kg per unit |
| Front rotor | 405x34mm high-carbon heat-treated curved-slot rotor, plated finish with corrosion protection |
| Bracket | CNC-machined, vehicle-specific bracket that bolts directly to the GLS's factory mounting points |
| Pads / lines | Matched brake pads and TTSPORT stainless steel brake lines |
Why It Works
A forged two-piece caliper flexes less under hard braking than a stock single- or dual-piston unit, which means the pedal transmits actual clamping force instead of absorbing it — the difference between a firm pedal and a mushy one under repeated hard stops.
- Lighter forged construction (~3.90kg per caliper) trims unsprung weight versus the heavier factory caliper, helping ride quality and steering response.
- The larger 405x34mm rotor mass gives the system more thermal capacity, which matters when a 340-hp SUV is being hauled down from speed repeatedly.
- The radial slot pattern helps clear dust and gas buildup at the pad-rotor interface, and the CNC bracket bolts straight to the factory mounting points — no spacers needed to clear the stock 20-inch wheels.
Installation Gallery
What does the TTSPORT TT8657 kit include for the Mercedes-Benz GLS?
Will the TT8657 six-piston kit clear the factory 20-inch GLS wheels?
What is the TT8657 caliper made from?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.