Toyota Highlander Big Brake Kit Upgrade / TTSPORT Classic 8703S
The Toyota Highlander is a big, roomy three-row SUV, and that extra size comes with extra weight the stock brakes weren't really built to shed in a hurry. Under repeated hard stops or a full load of passengers and cargo, the factory calipers and rotors give up bite well before you'd like them to. This build tackles that with a full front-and-rear TTSPORT upgrade.
The owner went with an 18-inch wheel-compatible setup: a TT8703S forged six-piston caliper up front on a 355x32mm rotor, and a TT8901 forged four-piston caliper out back on a 355x28mm rotor. Front and rear rotors are drilled and Dacromet-coated for corrosion resistance and heat management.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Toyota Highlander, 18-inch wheels |
| Front caliper | TTSPORT TT8703S forged six-piston caliper (upgraded from the TT8703 platform) |
| Front rotor | TT 355x32mm drilled, Dacromet-coated rotor |
| Rear caliper | TTSPORT TT8901 forged four-piston caliper |
| Rear rotor | TT 355x28mm drilled rotor |
| Bracket | Custom red-finished caliper brackets, front and rear |
Why It Works
TT8703S is TTSPORT's newer forged six-piston caliper, built off the TT8703's data but moved to a higher-strength forging process. A forged body flexes less under load than a cast one, so more of the pedal effort goes into clamping the pad against the rotor instead of deforming the caliper — that's what firms up the pedal on a heavy vehicle like the Highlander.
- Rear TT8901 forged four-piston caliper is purpose-built for rear-axle duty, adding real clamping force where the stock rear brakes were doing the least work.
- Larger 355mm front and rear rotors carry more mass and surface area than stock, so they absorb and shed more heat before fade sets in.
- Drilled rotor faces help clear off-gas and improve initial bite, while the Dacromet coating on the front rotor resists corrosion.
Custom color-matched brackets tie the calipers into a consistent red front-to-rear look, so the visual upgrade behind the 18-inch wheels reads as intentional rather than mismatched.
Installation Gallery
What wheel size does this Highlander big brake kit fit behind?
What's included in the front and rear kits on this Highlander?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.