Toyota of Buemi and Davidson suffer electrical problems while in the lead.
Two entries will campaign at Bahrain.
Porsche lapped quicker than both Audi and Toyota and ended free practice two with the fastest time, setting up what should be a thrilling qualifying session.
After Toyota led most of the session, the opening practice at Spa ended with Audi on top.
Anthony Davidson is a difficult man to pin down as he combines his Toyota Racing duties with a role as a commentator and analyst for Sky TV’s F1 programming in the UK.
Designed and built by ORECA for REBELLION Racing, the Toyota-powered R-One LMP1-L today was seen for the first time today at the iconic Spa-Francorchamps circuit.
The second round of the 2014 World Endurance Championship is scheduled for next weekend at Spa-Francorchamps.
The three manufacturers filled the first three places, perfectly demonstrating how competitive the grid will be in 2014.
YME will stimulate TOYOTA Racing’s team mobility by providing Yamaha EC-03 electric (2-wheeler) units for the rounds of Silverstone, Spa and Le Mans.
Audi, Toyota and Porsche will have two cars each testing.