Pastor Maldonado's miserable season continued in the Monaco Grand Prix last weekend, with the Lotus driver again failing to finish.

Maldonado ran eighth initially around the streets of Monte Carlo, but had to retire on lap 5 with brake problems. It was his fifth DNF from six races - his only finish so far in F1 2015, a 15th place in Bahrain.

"I had a problem with the brakes and I could feel the pedal pressure wasn't right from very early on and that compromised our race from the off," Maldonado lamented. "It got worse and worse so we had to retire the car.

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"It's a shame for the team, we had a good car here, very good pace for the race and I think a strong strategy.

"There's potential in the car, we just need to carry on, work hard, and look forward in the championship."

Meanwhile, Lotus technical director, Nick Chester later confirmed that a suspected hydraulic leak was the cause of the brake issues.

"For Pastor it was a real shame [he had to retire] as he was in a strong position with a quick car and with seventh position looking like a strong probability. Unfortunately he suffered from what looks like was a hydraulic leak which meant we had to retire him."