Volkswagen Golf GTI Big Brake Kit Upgrade / TTSPORT Classic 8703
The Volkswagen Golf GTI is one of the more capable hot hatches on the road — a 2.0 TSI engine that hits peak torque of 280 Nm as low as 1,700 rpm and holds it all the way to 5,000 rpm, good for a 0-62 mph run in about 7.1 seconds. The chassis is already sorted for spirited driving. The one piece that doesn't quite keep pace is the factory brake package, which is why this owner moved to a TTSPORT TT8703 GT6 big brake kit.
The upgrade swaps the stock caliper and rotor for a TT8703 GT6 six-piston monobloc-cast caliper paired with a 355x32mm slotted two-piece rotor and TTSPORT stainless steel brake lines — a package built to match the GTI's power without touching the drivetrain.
Vehicle & Kit Specs
Here's what went on this GTI, item by item.
| Item | Specification |
|---|---|
| Vehicle | Volkswagen Golf GTI, 2.0 TSI, 18-inch factory wheels |
| Front caliper | TTSPORT TT8703 GT6 six-piston monobloc-cast caliper, three pairs of differently sized opposed pistons |
| Front rotor | TT 355x32mm slotted (drilled) two-piece rotor |
| Bracket | Vehicle-specific caliper bracket, fitted and matched to the GTI's hub |
| Lines | TTSPORT stainless steel brake lines |
Why It Works
- A one-piece cast caliper body flexes less under load than a stock sliding caliper, so pedal input translates more directly into clamping force.
- Three pairs of differently sized opposed pistons spread pressure across the pad more evenly than a uniform-piston layout, which is what gives the GT6 its more linear feel through the pedal.
- The larger 355mm rotor diameter and 32mm two-piece construction add mass and swept area, giving the system more heat capacity before fade sets in.
- The slotted rotor face helps clear gas and debris off the pad surface under repeated hard stops, keeping bite consistent lap after lap.
- Each TT8703 kit is built to the specific hub and bracket data of the fitment vehicle, down to the mounting hardware, so it goes on without clearance or bolt-up surprises.
Fitment details like the bracket geometry and mounting hardware are matched to the GTI's hub during kit development, which is why the install goes on cleanly with no bind or interference at the knuckle.
Installation Gallery
With the swap done, the difference at the wheel is obvious — the 355mm rotor fills out the 18-inch wheel and the red GT6 caliper is clearly visible through the spokes. On the road, the owner reports a noticeable jump in braking feel and stopping performance.
Frequently Asked Questions
What wheel size does this Golf GTI brake upgrade fit?
What's included in the TT8703 kit used on this GTI?
Why does the GT6 caliper use three different piston sizes per side?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.