Few but very intense braking sessions for the MotoGP debut at the Chang International Circuit

10/3/2018

Four braking sessions each lap of at least 1.4 g for the Thai track

After the World Superbike's positive experience, also the MotoGP is coming to Thailand for the 15th round of the 2018 World Championship that is held from 5th to 7th October at the Chang International Circuit.

It has been built with a 54 million Euro investment and has been inaugurated in October 2014. It is called after the name of a local make of beer. The track has been designed by the German architect Hermann Tilke and it's 410 km North of the capital Bangkok, in the Buriram region, that in the local language means “town of happiness”.

Unlike their Superbike colleagues, the MotoGP riders should enjoy lower temperatures: the historical average for this area in October is 30 degrees Celsius, anyhow quite enough.

The riders of the premier class have become familiar with the track in February with 3 days of tests. The track's layout alternates very long straightways that end with a hard braking session with second and third gear curves where gaining the right pace is essential.

Various drivers have noticed similarities with the Red Bull Ring, others with the Circuit of the Americas. Brembo's engineers, who assist 100 per cent of the MotoGP 2018 drivers, believe that the Chang International Circuit falls within the category of demanding circuits for the brakes.

On a scale of 1 to 5 it has earned 4 on the difficulty index, the same score given to Jerez, Aragon and Brno.

 

 

 
 

The demand on the brakes during the GP

The MotoGPs turn to their brakes for 7 of the track's 12 corners, the same as for the Superbike: also the 27 seconds of brake usage during each lap is almost identical, but as the lap times are different also the percentage the braking system is functioning during the race is.

For the MotoGPs it's 30 per cent, for the Superbikes it's 28 per cent. Thanks to the greater engine power, therefore also the top speeds are higher, and to the carbon braking systems, the average peak deceleration for the MotoGP is 1.31 g while for the Superbike it's only 1.24 g.

Adding up all of the forces applied by a rider on the Brembo brake lever from the starting line to the checkered flag, the result comes in at more than 1000 kg. This is 200 kg more than for the Superbike riders although the Superbike race is 6 laps shorter.

Instead the force applied during a lap is after all similar: 39 kg for the MotoGP, 38.5 kg for the Superbike.


 

The most demanding braking sections

Of the circuit's 7 braking sections 2 are considered very challenging on the brakes; while 4 are of medium difficulty and 1 is light.

The most challenging session of all for the braking system is the third turn, at the end of an almost one kilometer long straightway: the MotoGPs brake from 316 km/h to 77 km/h in 5.8 seconds during which they travel 282 meters.

The riders apply a 6.3 kg load on the brake lever undergoing a 1.5 g deceleration while Brembo's HTC 64T brake fluid reaches a 10.9 bar pressure. The speed entering the last turn before the finish line is even less (69 km/h): the bikes approach it going at 265 km/h and brake for 5.1 seconds traveling in that time 213 meters. The load on the lever is 5.8 kg and the deceleration is 1,4 g.

Although the speed falls to “just” 151 km/h, the braking at the first turn reaches some of the third turn's values: the deceleration is 1.5 g, the load on the lever 6.3 kg and the fluid's pressure 10.9 bar.

Neither the other track's 4 braking sections are to be overlooked, because the braking time is always more than 2.7 seconds long with 3.4 seconds peeks while the decelerations range from 1 g to 1.4 g.

 

 

Brembo performance



Since 1978 the motorbikes with Brembo brakes have won 477 premier class GPs with 44 different riders: the record holder of victories with the Italian brakes is Valentino Rossi, who has won on his own 89 GP of the 500-MotoGP.

The last victory of a bike in the 500 class without Brembo's brakes being fitted dates back to 21st May 1995​


 

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

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