For the 1968 season a 'B' specification T86 was produced to incorporate the BRM V12 which replaced the ageing Maserati unit and made its debut at the second race of the season in Spain. Two cars were initially constructed, a third being built after Redman's crash at Spa, and these were used exclusively by the Cooper works team during the 1968 Formula One season. Cooper's version of the BRM V12 was a less powerful "sportscar" version of the engine, which was already one of the heaviest on the grid, but after finishing third and fourth (thanks to the unreliability of others) in both Spain and Monaco the car gradually slipped down the grid towards the season's end. The Mexican Grand Prix would be the last Formula One race for a works Cooper car, as the Cooper team decided it could not continue to compete in Formula One with no sponsorship money available for 1969 and auctioned off the two T86B chassis still in its possession. The first T86B was acquired by Martin Brain who drove the car with some success in British hillclimb and club races, but in a Formula Libre race at Silverstone in 1970 Brain left the track and flipped the car, and was killed.