Brembo Unveils Round 4 of World Superbike in Assen

4/10/2019

An in-depth look at the braking systems on the production-based motorcycles at TT Circuit Assen

​​​​​​​​​​​​​​The fourth round of the World Superbike Championship is scheduled for April 12 to 14 on TT Assen Circuit. The circuit was inaugurated in 1925 and at the time was about 28.4 km (17.6 miles) long. It was shortened to 7.7 km (4.8 miles) ​in 1955, then it underwent numerous modifications resulting in its current length of 4,542 meter (2.822 miles). The circuit has hosted World Superbike Championship without interruption since 1992.​

Three months prior, it was the stage for Mick Doohan's fall during qualifying laps for the 500cc class. It became impossible for him to use his war-torn right leg, so the Australian used the thumb brake master cylinder designed by Brembo engineers to return to the starting grid. TT Assen Circuit stands out for its 18 corners, two thirds of which are to the right, and very short straightaways: the longest straightaway ​measures just 487 meters (1,598 feet) and the one at the starting line isn't more than 300 meters (984 feet). ​

As you can imagine, this is a very drivable track that doesn't require demanding braking. This characteristic combined with the track's geographic location provide optimal conditions for cooling the steel discs. According to the Brembo technicians, who work closely with 15 World Superbike Championship riders, TT Assen Circuit is only slightly demanding on the brakes. On a scale of 1 to 5, it earned a 1 on the difficulty index, which is exactly what Phillip Island scored. ​


 

The demand on the brakes during the GP

Just like the MotoGP riders, Superbike riders turn to their brakes on 10 of the 18 curves on the track. Only Imola, Jerez, Villicum and Losail require the riders to brake more often per lap. ​

The brakes are used for 28 seconds and a half per lap, which is equivalent to 30​% of the overall race time. This percentage is the same as other 4 Rounds: Aragon, Imola, Misano and Portimão.

​​Never surpassing 285 km/h (177 mph), the Superbikes reach a maximum of 1.2 G in deceleration.​​​

As a consequence, the average deceleration on the track is 1.03 G, which is among the lowest of the circuits used in the first part of the championship​. In Thailand, the average was 1.27 G.

The limited braking force is demonstrated by the average reduction in speed when braking: the average for the 10 braking sections is 87 km/h (54 mph), the lowest in the 2019 World Superbike Championship, while in Aragon it measured 102 km/h (63 mph) and in Buriram it had reached 135 km/h (84 mph).​

Summing up all of the force applied by a rider on the brake lever from the starting line to the checkered flag, the result comes in at more than 840 kg.

 

 
 

The most demanding braking sections

Of the 10 braking sections at TT Circuit Assen, only one is considered highly demanding on the brakes, ​six are of medium difficulty and three are light.

The most challenging by far is the first one after the finish line (Haarbocht Turn) because the Superbikes enter it going 276 km/h (171 mph) and have to lose 171 km/h (106 mph) before the end of the 226 meters (741 feet) in the braking section. ​

The riders use their brakes for 4.1 seconds and apply a load of 4,5 kg (9.9 lbs) on the lever, which is about 0,7 kg (1.5 lbs) less than what the MotoGP riders apply in this same corner, but they use Brembo carbon discs and calipers​.

Braking at turn 16 puts greater pressure on the braking system than at turn 1: 9.8 bar compared to 9.6 bar​. ​At turn 16, the Superbikes arrive going 211 km/h (131 mph) and let up on the brakes only after going down to 97 km/h (60 mph), an effort that takes 3.5 seconds. ​ ​

Turn 9 (De Bult) is also worth mentioning: 178 meters (584 feet) of braking distance, 1 G in deceleration and 4,3 kg (9.5 lbs) on the lever to go from 231 km/h (143 mph) to 105 km/h (65 mph).​


 

Brembo performance

Bikes with Brembo brakes won all of the last eight World Superbike races at TT Assen Circuit: Jonathan Rea claimed seven victories with Kawasaki, but the last race was won by Tom Sykes, also with Kawasaki.

​Second place also went to motorcycles with Brembo brakes in these same eight races: one for Yamaha, two for Ducati and five for Kawasaki.​


 

Brembo S.p.A. | P.IVA 00222620163

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