The Australian clocked 1 minute, 50.321 seconds, with Ferrari’s Fernando Alonso second quickest in 1:50.461, and McLaren’s Jenson Button third in 1:50.770.
Heavy rain affected the first practice, and another big downpour arrived nearly one hour into the second session.
“We got some dry running in, but only around four laps, two laps on the soft tire and two on the medium,” Webber said. “We need to get out there and get the mileage in, but on the other side of the coin we need to save tires for Saturday and Sunday. The curbs are the hardest thing here when it’s wet, it makes the white lines like ice.”
Defending F1 champion Sebastian Vettel was only 10th fastest, but took no risks in the treacherous conditions.
“It was difficult to judge lap times and the overall pace today, but the car feels OK,” said Vettel, who was fourth on his first practice run. “Let’s see what we can do tomorrow.”
Webber, who is still seeking his first win 11 races into the season, went out again briefly toward the end of the session but kept his speed down on the soaked track.
The 4.3-mile Spa circuit is the longest and one of the most demanding on the calendar beside Monaco’s track. Its famed corners Eau Rouge and Blanchimont push drivers to the limit, and this prompted some cautious driving in both sessions.
Seven-time former champion Michael Schumacher was 11th fastest the second time around after posting the best time in the first practice ahead of his Mercedes teammate Nico Rosberg, followed by Button and Vettel.
Schumacher, who made his debut at Spa 20 years ago and has won the race six times, went out early when the track was still dry and before the rain starting lashing down to clock a leading time of 1:54.355 seconds.
“It was a special feeling to be out on track today for the first practice sessions of this anniversary weekend in Spa. A lot of things have changed here in the past 20 years, but the weather certainly hasn’t,” Schumacher said. “Today was another typical Spa day, with mixed conditions and very little dry running. The conditions meant that we couldn’t do much work on the set-up, although we made the most of the limited time when the circuit was dry.”View Entire Story
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