 The 1966 world championship season opened with the Monaco Grand Prix . Brabham was affected by a cold , and qualified poorly before retiring when the BT19 's gearbox failed . Surtees led the race in his Ferrari before his differential failed on lap 15 ; the race was won by Jackie Stewart in a 2 @-@ litre BRM P261 . At the following Belgian Grand Prix at the Spa circuit , Brabham survived an enormous 135 miles per hour ( 215 km / h ) slide in the rain on the first lap . The shower eliminated half the field , including Stewart , who would miss the next race with his injuries . The BT19 , using Goodyear tyres that were not suited to the conditions , came home fourth of five classified finishers . Surtees won the race for Ferrari , the last before he quit the Italian team . 
