Jaguar XEL Big Brake Kit Upgrade / TTSPORT Slim SL6
The Jaguar XEL sells on British styling and a chassis that likes to be driven, but the factory brake pedal doesn't match the rest of the car. Owners consistently report a soft pedal and a delay between input and actual stopping force — a common complaint on a sport-leaning sedan that otherwise handles like it should stop harder. Upgrading the brakes is the obvious fix, except the XEL's 18-inch and 19-inch factory wheels leave very little room behind the spokes, and most aftermarket big brake kits either rub the wheel barrel or need a flange adapter to clear it — a workaround that changes hub geometry and can affect ride stability.
TTSPORT built a six-piston kit specifically for this car — the Slim Series SL6 — designed to bolt on to the factory wheels with no structural changes. This case study covers a customer install on an 18-inch-wheel XEL.
Vehicle & Kit Specs
The front axle upgrade paired a TTSPORT SL6 six-piston caliper with a 355mm high-carbon rotor and a vehicle-specific bracket, using the XEL's factory 18-inch wheel with zero clearance modifications.
| Item | Specification |
|---|---|
| Vehicle | Jaguar XEL, 18-inch factory wheels (also compatible with 19-inch) |
| Front caliper | TTSPORT SL6 six-piston caliper, two-piece forged aluminum body |
| Front rotor | TTSPORT 355mm high-carbon rotor |
| Bracket | Vehicle-specific caliper bracket, custom-fit for the XEL |
| Pads / lines | TTSPORT high-performance brake pads, stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
Below is the full published spec sheet for the SL6 caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Slim Series |
| Model / Application | SL6 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | One-piece heat-insulated pistons |
| Piston Diameter | 28 mm × 2 / 30 mm × 2 / 36 mm × 2 |
| Caliper Dimensions | L 350 mm × W 135 mm × H 120 mm |
| Total Piston Area | 46.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.60 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–355 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 82 |
| Caliper Mounting Type | Radial mount with vehicle-specific caliper brackets |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
Why It Works
TTSPORT scanned and modeled the inner barrel of the XEL's factory wheel to design a caliper profile with over 99% clearance from the spokes. That's the difference between a kit that "fits with an adapter" and one that fits, period — no flange plate changing the wheel's offset or adding unsprung weight.
- Forged two-piece caliper body with reinforcing ribs adds rigidity, so pedal input goes into clamping force instead of caliper flex.
- A progressive six-piston layout gives a linear, comfortable initial bite that firms up into strong, confident stopping force as pedal travel increases.
- One-piece heat-insulated pistons and high-temp seals hold clamping force more consistently as brake temperatures rise.
- The 355mm rotor is a meaningful jump over the factory disc, adding thermal mass and swept area to resist fade under repeated braking.
Installation Gallery
FAQ
Will the TTSPORT SL6 kit fit the Jaguar XEL's factory wheels?
What does the Jaguar XEL SL6 brake kit include?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.