Cadillac CT4 Big Brake Kit Upgrade / TTSPORT Classic 5440
A Cadillac CT4 owner looking for more front-end bite and a firmer pedal went with TTSPORT's Classic Series 5440 big brake kit. It's a straightforward OEM+ swap: forged four-piston caliper up front, in place of the factory unit, with no cutting, no spacers, and no exotic fitment work involved.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Cadillac CT4 |
| Front caliper | TTSPORT Classic Series 5440, forged two-piece aluminum, 4-piston |
| Front rotor | Recommended Ø330–345 mm x 28 mm |
| Bracket | Vehicle-specific radial-mount caliper bracket |
| Pads / lines | Performance pads and vehicle-specific brake lines |
| Hardware | Mounting hardware and fluid included |
Here's the official spec sheet for the TTSPORT 5440 caliper used in this build:
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 5440 |
| Axle Position | Front |
| Piston Count | 4-piston |
| Piston Type | Star-profile racing pistons without dust boots |
| Piston Diameter | 38 mm × 2 / 41 mm × 2 |
| Caliper Dimensions | L 276 mm × W 138 mm × H 80 mm |
| Total Piston Area | 49.1 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 2.65 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–345 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 86 |
| 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
Rigidity & Clamping Force
A stock single- or dual-piston floating caliper flexes under hard braking, which is a big part of why a factory pedal can feel soft or inconsistent after repeated stops. The 5440's forged two-piece aluminum body is stiffer than a cast caliper, so more of your pedal input goes into clamping force instead of flexing the caliper housing.
- Four star-profile pistons (38 mm x2 / 41 mm x2) give 49.1 cm² of total piston area per caliper — more clamping surface than a stock two-piston setup, spread evenly across the pad.
- Radial mounting with a vehicle-specific bracket keeps the caliper aligned with the rotor without shims or spacers.
A minimum spoke clearance of just 86 mm means the 5440 tucks behind 17-inch and larger wheels — no need to size up rims to run the kit. Paired with a 330–345 mm rotor, the larger swept area also gives the system more surface to shed heat into, which matters if you're leaning on the brakes repeatedly rather than making a single panic stop.
Frequently Asked Questions
What does the TTSPORT 5440 kit add to the Cadillac CT4's front axle?
What wheel size does the TTSPORT 5440 require?
What rotor size pairs with the TTSPORT 5440 caliper?
Need fitment confirmation? Send your CT4's trim and wheel size before ordering, and we'll confirm clearance with the 5440.