Brembo and motorcycle radial brake development – Part 3

Part OnePart Two – Part Three


In Part 2, we saw Brembo’s radial braking system adopted first in testing, followed by MotoGP, offering clearly superior performance, with Aprilia the earliest adopter, followed by Suzuki. Radial brake calipers would soon be the standard also in Superbike, as well as local competition. 

MotoGP Legend - Kenny Roberts Jr
MotoGP Legend – Kenny Roberts Jr on a Suzuki Brembo radial monobloc brake equipped machine

This followed on from Part 1, where Brembo first floated the concept of not only the radial mount caliper, but also the monobloc design, only for the monobloc design alone to be accepted.


From the track to the streets

It was a short step from the track to standard production, the time was ripe and the radial brakes proven reliability on the track provided plenty of guarantees for standard production bikes as well.

This last taboo was beginning to fall away. Once again Brembo was successfully implementing its mission, transferring innovation and know-how from the track to the streets, putting them at the disposal of all motorcycle riders.

Brembo monoblock caliper, with radial mounts
Brembo monoblock caliper, with radial mounts

It was once again the manufacturer from Noale that believed in this solution. In 2003, while attempting to relaunch the latest evolution of the RSV Mille R, Aprilia decided to outfit the twin-cylinder with a pair of these new Brembo calipers, derived directly from racing.

Ducati's 1098 featured monobloc radial brakes in 2007
Ducati’s 1098 featured monobloc radial brakes in 2007

The RSV Mille R was therefore the first street bike equipped with radial mount calipers. Then, in 2007, the Ducati 1098 became the first standard production bike with a monobloc radial mount caliper.

The invention was quickly adopted by the other manufacturers because nobody wanted to be left behind. On the standard production bikes, the radial mount caliper proved to provide all the advantages displayed on the track and to bring out others as well.

2017 Suzuki GSX-R1000R - Brembo radial-mount monoblock calipers with Motion Track Brake System
 The new 2017 Suzuki GSX-R1000R features Brembo radial-mount monoblock calipers

The brake caliper, and as a consequence the pads, remain perfectly parallel to the disc resulting in uniform wear and guaranteeing consistency in the lever over time. All of this improves braking even more, aiding in the duration of the friction material as well, which tends towards uniform wear and a longer lifespan.

After a limited application in super sport motorcycling, the radial mount calipers began to be seen on naked and touring bikes. Nowadays, every category of bike, scooters included, presents at least one model with radial mount calipers.

Brembo brakes on the MotoGP machinery at the 2017 Phillip Island test
Brembo brakes on the MotoGP machinery at the 2017 Phillip Island test

Even calipers for 125cc bikes produced by Brembo in India under the brand name ByBre – the Brembo brand for braking systems on scooters and small to medium-cylinder motorbikes – are radial calipers today.

2017 KTM 390 Duke
2017 KTM 390 Duke with ‘Bybre’ radial brakes

What seemed like a bizarre idea of a group of visionary engineers just a few decades ago has now become the “de facto” standard in the industry, the loyal ally of every rider on the track and an object of desire on the part of all motorcycle riders.

Vision, wit and creativity combined with tenacity and perseverance helped Brembo do away with prejudice and resistance, against all odds. In a word, they enabled Brembo to innovate.


Time spent braking – MotoGP circuits with most braking

One of the characteristics of Brembo MotoGP brakes is their excellent consistency in performance even after repeated use. But not all the tracks are the same because on some the brakes are used for a longer time than on others: where this happens, there is an increase in operating temperature and greater wear on the friction material.

In order to assess this effect, Brembo have ranked the 18 tracks in the Championship, considering the percentage of time spent braking during each GP.

Brembo - Circuits with most braking in MotoGP
Brembo – Circuits with most braking in MotoGP

Average deceleration – Circuits with hardest braking  

Not every braking session is the same because not all of the tracks are the same: there are those where you brake more violently and those where you brake less decisively/strongly. In order to demonstrate this characteristic, we have ranked the 18 MotoGP tracks based on the riders’ average deceleration.

 

Brembo - MotoGP circuits with the greatest braking deceleration
Brembo – MotoGP circuits with the greatest braking deceleration

Brake categorisation – Most difficult circuits for brakes

Some tracks are harder than others on the MotoGP bikes’ braking systems. This assessment takes into account both numerical factors (number of braking sections, intensity and average deceleration) and quality factors such as grip, intensity and location of the braking sections on the circuit.

Brembo - Most difficult circuits in MotoGP on brakes
Brembo – Most difficult circuits in MotoGP on brakes

Taking all of this data and variables into consideration, Brembo engineers have ranked the 18 circuits on a scale of 1 (not very demanding) to 5 (extremely demanding).


Hardest Braking – Five toughest braking sections

What makes a MotoGP braking session extremely hard? The answer is the result of several items: starting and finishing speed, deceleration expressed in g, but also braking time and space, as well as the load applied to the brake lever.

By considering and pondering all of these elements, Brembo has come up with a composite indicator of the difficulty of a braking section for the braking system. Here is the ranking of the five most demanding braking sections for the 2016 MotoGP season.

MotoGP 2016 - Circuit of Americas, Austin Texas
MotoGP 2016 – Circuit of Americas, Austin Texas
USA (Austin) – Turn 12

This is ranked number one thanks to its record 267 km/h reduction in speed. The MotoGP bikes go from 337 to 70km/h in 5.9 seconds and demand about 300 metres of braking distance. The 9kg of force applied to the brake lever are also noteworthy.

MotoGP 2016 Argentina
MotoGP 2016 Argentina
Argentina (Termas De Rio Hondo) – Turn 5

This corner earns its ranking because of the 12kg of force applied to the lever and the 6-second braking time required after a 1,076 straight where the riders reach speeds of 330km/h. The 270 metres of braking distance is also impressive.

Bradley Smith - Image: Gold and Goose
Bradley Smith – Image: Gold and Goose
Malaysia (Sepang) – Turn 1

The third step of the podium goes to this corner that is approached at just under 70km/h after touching 331km/h. Its 264km/h reduction in speed is frightful. Few corners in the world can match it, considering the fact that the braking session lasts six seconds and for about 289 metres.

Jack Miller
Jack Miller at Mugello
Italy (Mugello) – Turn 1

This is a truly tough braking section because the bikes arrive after having reached 351km/h, the MotoGP top speed. Another record breaker is the 318metre braking distance needed to drop an incredible 260km/h in just 5.6 seconds.

Movistar Yamaha MotoGP’s Valentino Rossi emerged victorious from a thrilling battle with Ducati Team’s Andrea Dovizioso to win the opening round of the MotoGP season at Qatar’s Losail International Circuit.
Valentino Rossi and Andrea Dovizioso battle it out at Qatar’s Losail International Circuit in 2015
Qatar (Losail) – Turn 1

The first braking section of the Championship demands 8kg of force on the lever and 5.2 seconds during which the bikes travel about 265 metres. After all, the MotoGP bikes reach 350km/h and drop 244km/h.\


If you didn’t catch the interesting first two instalment of this feature then please use the links below to follow the story of motorcycle radial brake development from the beginning.

Part OnePart Two – Part Three