The Dry Sack corner at Jerez is the second hardest braking section in the World Championship

10/16/2017

How strange: 12 braking points on 13 corners and Rea has never won here

Having duly celebrated the third consecutive world champion title earned by Jonathan Rea, the World Superbike Championship is back in Spain. The 12th and second-to-last race of the 2017 season is scheduled for October 20 - 22 at Circuito de Jerez in Andalusia, about 100 km from the Strait of Gibraltar.

World Superbike began racing on this track in 1990, but for the second edition it had to wait until 2013. Various types of curves alternate all along the 4.426 meters of the track: Slow (60 to 70 km\h), fast (120 – 130 km\h) and very fast (160 km\h).

The 13 corners (8 right-handed, 5 left-handed) make up 31% of the total length of the circuit and provide lots of opportunity for overtaking. The considerable changes in slope mean the bikes need to handle well and be well balanced, in addition to being stable in braking.

On November 24 last year, Jonathan Rea with Kawasaki managed to run faster on this track than almost all the MotoGP bikes that rode the circuit that day. But if we look at the fastest pole positions ever in Jerez, the Superbikes are slower than the MotoGP bikes by more than a second.

According to Brembo technicians, who work closely with 17 World Superbike riders, Circuito de Jerez is a fairly demanding circuit for the brakes. On a scale of 1 to 5, it earned a 4 on the difficulty index, exactly the same score given to the tracks at Aragon and Magny-Cours.


 
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The demand on the brakes during the GP

With the exception of turn 3, the Superbike riders use their brakes on all of the other 12 corners. The MotoGP bikes refrain from using their brakes on both turn 3 and the second-to-last corner, called the Ferrari.

On one lap at Jerez, the Superbike brakes are used for about 30 seconds, which is the same as 29% of the overall duration of one lap.

Even though the average is lowered by three corners with a deceleration below 1 G (turns 7, 10 and 12), the mean deceleration per lap is 1,15 G, the third highest in the championship after the 1,24 G at Chang and the 1,23 G at Donington.

Beyond that, 1,15 G is a good 0,07 G higher that the deceleration registered by a Lamborghini Huracan Performante going from 100 km\h to 0 km\h.

Summing up all of the force applied by a rider on the Brembo brake lever from the starting line to the checkered flag, the result comes in at nearly 0,6 tons. For the MotoGP riders on the other hand, the overall load on the lever is more than 0,75 tons because their race is longer: 27 laps compared to the 20 laps for the Superbikes.


 

The most demanding braking sections

Of the 12 braking sections at Circuito de Jerez, two are classified as very demanding on the brakes, seven are of medium difficulty and the remaining three are light.

The most challenging by far is the Dry Sack corner (turn 6), which is also the second most demanding in all the 2017 World Championship.

The Superbikes enter the corner going 271 km\h and use their brakes to reduce their speed by 207 km\h. This braking point requires 4,7 seconds and 194 meters, during which the riders apply a 6,2 kg load on the brake lever and experience a deceleration of 1,5 G. Meanwhile, the pressure of the Brembo HTC 64T brake fluid reaches 13,2 bar.

Braking on turn 1 is just slightly less challenging, although still very complex. The riders go from 265 km\h to 88 km/h in 172 meters, and clamp on their brakes for 4 seconds while applying a 5,9 kg load on the lever. Here too the deceleration is 1,5 G, but the pressure of the brake fluid goes up to 12,7 bar.

Turns 5 and 8 stand out for having 1,3 G in deceleration and an entry speed of about 120 km\h.

Turn 13 on the other hand boasts the longest braking section in terms of space (140 meters) and time (3,7 seconds), as well as a deceleration of 1,2 G.

 

 

Brembo performance

Bikes with Brembo brakes have won all 10 of the World Superbike Championship races held at Circuit de Jerez. The victory went to Ducati at five of these, Aprilia won four times and Kawasaki once.

At four of the last five editions, the winner of Race 1 went on to win Race 2 as well: Raymond Roche in 1990, Eugene Laverty in 2013, Marco Melandri in 2014 and Chaz Davies last year. In spite of 50 victories in World Superbike, every time with Brembo brakes, Jonathan Rea has yet to win on this track.


 

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

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