Cadillac XT5 Big Brake Kit Upgrade / TTSPORT Classic 7640
This install case documents a Cadillac XT5 fitted with the TTSPORT 7640, a Classic Series six-piston front big brake kit. The caliper is a two-piece forged aluminum unit designed to bolt on with vehicle-specific brackets and fittings, giving the XT5 a stiffer, larger-clamping front brake setup in place of the stock hardware.
The 7640 caliper sits on the front axle with a vehicle-specific mounting bracket, keeping the setup a straightforward bolt-on rather than a custom fabrication job. TTSPORT builds the 7640 as part of its Classic Series lineup, aimed at owners who want a meaningful upgrade over stock calipers without moving into a full track-only setup.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Cadillac XT5 |
| Front caliper | TTSPORT 7640, Classic Series, six-piston forged monobloc |
| Recommended rotor | Ø355-380mm x 32mm |
| Recommended wheel size | 18 in or larger |
| Mounting | Radial mount, vehicle-specific caliper bracket and brake line fittings |
Below is the full official spec sheet for the TTSPORT 7640 used in this build.
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 7640 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 27 mm × 2 / 33 mm × 2 / 38 mm × 2 |
| Caliper Dimensions | L 353 mm × W 162 mm × H 92 mm |
| Total Piston Area | 51.2 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.70 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 18 in or larger |
| Recommended Rotor Size | Ø355–380 mm × 32 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 98 |
| 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
A forged, two-piece aluminum caliper body flexes less under hard pedal pressure than a stock cast-iron floating caliper, so more of the pedal force goes into clamping the pads instead of deflecting the caliper housing. That translates into a firmer, more predictable pedal on the XT5.
- Six pistons across three diameters (27/33/38mm) spread clamping force more evenly across the pad surface than a smaller-piston stock caliper.
- A two-piece forged aluminum body keeps caliper weight and flex down compared with a cast one-piece housing.
- Vehicle-specific brackets and fittings keep the 7640 a bolt-on install rather than a custom adaptation.
Fitment & Wheel Clearance
TTSPORT specs the 7640 for an 18-inch or larger wheel with a minimum spoke clearance of 98mm, and pairs it with a Ø355-380mm x 32mm rotor. On this Cadillac XT5, that combination lets the caliper mount with the vehicle-specific bracket without requiring wheel spacers.
FAQ
What does the TTSPORT 7640 kit add to the Cadillac XT5's front brakes?
What wheel and rotor size does the TTSPORT 7640 need?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.