Ningbo 4-Hour Endurance Test: TTSPORT TR40/TR20 Calipers

A deep-tuned Honda Fit ran the full 4-hour touring car endurance race at Ningbo International Speedway on TTSPORT TR40 four-piston calipers up front and TR20 two-piston calipers out back — one of China's toughest circuits on brakes, with four drivers rotating through the car and no reported fade at the checkered flag.

Four Drivers, One Car, One Brake Setup

Honda Fit endurance racer on track at Ningbo International Speedway running TTSPORT TR40 front calipers

Endurance racing has no room for a brake system that's just along for the ride — it's the system that decides whether a car makes it to the finish. Ningbo International Speedway is widely regarded in China as one of the hardest tracks on brakes, and that reputation made it the right proving ground for this test.

The car was a heavily race-prepped Honda Fit fitted with TTSPORT's TR40/TR20 race caliper setup — TR40 four-piston calipers on the front axle, TR20 two-piston calipers on the rear. Drivers Sun Hui, Wang Wenbin, Lin Jun, and Wu Naidong rotated through the seat over four straight hours of racing, putting the TR series through a complete real-world stress test.

Race-tuned Honda Fit chasing through Ningbo Speedway's tight infield during the 4-hour touring car endurance race

Four hours is a long time to ask any braking system to stay consistent lap after lap, especially with different drivers, fuel loads, and tire conditions cycling through the same car.

Why Ningbo Is Considered a Brake Killer

Ningbo International Speedway runs about 4 kilometers, but the layout is tight and relentless — dense heavy-braking zones, back-to-back low-speed corners, and short gaps between braking points. There's no long straight to give the system a break. That combination means high-frequency heavy braking every lap, heat that keeps stacking with almost no window to shed it, and a pedal that has to stay consistent — the smallest hint of fade gets amplified instantly by the driver's foot. Coming off the main straight and into the tight corner combination, the calipers have to build stopping power fast while staying linear, or the car loses lap time and the system starts burning through its service life early.

Wide view of Ningbo International Speedway's tight, corner-heavy 4-kilometer layout

Touring car braking into one of Ningbo Speedway's closely spaced low-speed corners

A Honda Fit's Four-Hour Braking Grind

Honda Fit endurance car exiting a hairpin at Ningbo International Speedway

The Honda Fit is light, short-wheelbase, and quick-natured — great for a fast racing rhythm, but that same character piles pressure on the brakes. Frequent braking into frequent corners keeps the system working at high load and high frequency the entire race.

Driver swap in progress on the Honda Fit endurance entry during the 4-hour race

For a car like this, the challenge isn't one massive stop — it's making every single stop over four hours feel identical to the driver.

TR40 × TR20: Built for Endurance, Not Just a Single Lap

TTSPORT TR40 four-piston forged race caliper mounted on the Honda Fit's front axle

TR40 Four-Piston Race Caliper (Front)

The TR40 uses a one-piece forged, high-rigidity body with hydraulic circuits and seals tuned for sustained high-heat endurance racing. Under Ningbo's back-to-back heavy braking, it held steady output with a consistent pedal stroke lap after lap — a predictable feel that let drivers brake later and commit to the corner with confidence.

TTSPORT TR20 two-piston race caliper fitted to the Honda Fit's rear axle

TR20 Two-Piston Race Caliper (Rear)

The TR20 handles precise rear brake force distribution to keep the car balanced under braking, which lowers the risk of rear instability and extra heat buildup over a long stint. Strong up front, stable out back — that's the core logic behind pairing TR40 with TR20 for endurance work.

4 hrs

Non-stop endurance race distance

Drivers rotating through the same car and same brake setup

21 yrs

TTSPORT's track record developing braking systems

The Track Doesn't Lie

Across four hours of racing, the car went through changing fuel loads, tire wear, and different driving styles behind the wheel — but the braking system held its line the whole way. No noticeable fade, no change in pedal travel, and stopping power stayed linear and controllable from the first lap to the last. On a circuit that eats brakes for a living, simply finishing strong is the clearest endorsement a braking system can get.

Honda Fit endurance racer mid-corner at Ningbo Speedway with TTSPORT TR40/TR20 calipers holding steady braking performance

Honda Fit touring car under braking late in the 4-hour Ningbo endurance race

Pit lane view of the TTSPORT-equipped Honda Fit during the Ningbo endurance race

From the Track Back to the Street

TTSPORT has spent 21 years building braking systems and treats track validation as a non-negotiable step in every product's development. The 4-hour touring car endurance race at Ningbo International Speedway wasn't just another race weekend — it was a real test of stability, reliability, and safety margin under conditions most street setups never see.