Brabham BT45
 The Brabham-Alfa Romeo BT45 of Rolf Stommelen at the 1976 German GP |
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| Category | Formula One | ||||||||
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| Constructor | Brabham | ||||||||
| Designer(s) | Gordon Murray | ||||||||
| Predecessor | BT44 | ||||||||
| Successor | BT46 | ||||||||
| Technical specifications | |||||||||
| Chassis | aluminium monocoque | ||||||||
| Suspension (front) | double wishbones, pull-rod actuated coil springs over dampers, anti-roll bar | ||||||||
| Suspension (rear) | single top links, twin lower links, twin radius arms, coil springs over dampers, anti-roll bar | ||||||||
| Axle track | Front: 1,448 mm (57.0 in) Rear: 1,524 mm (60.0 in) |
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| Wheelbase | 2,464 mm (97.0 in) | ||||||||
| Engine | Alfa Romeo 115-12 and Ford-Cosworth DFV 2,995 cc (182.8 cu in), Flat-12 NA, mid-engine, longitudinally mounted | ||||||||
| Transmission | Hewland, Brabham 6-speed manual | ||||||||
| Fuel |
1976-1977: Fina 1978: Agip |
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| Tyres | Goodyear | ||||||||
| Competition history | |||||||||
| Notable entrants |
Martini Racing Parmalat Racing Team |
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| Notable drivers |
 Giorgio Francia Niki Lauda Carlos Pace Larry Perkins Carlos Reutemann Rolf Stommelen Hans Joachim Stuck John Watson
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| Debut | 1976 Brazilian Grand Prix | ||||||||
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| Constructors' Championships | 0 | ||||||||
| Drivers' Championships | 0 | ||||||||
The Brabham BT45 was a Formula One car designed by South African engineer Gordon Murray for the 1976 Formula One season. In upgraded BT45B and BT45C form, it also competed in the 1977 and 1978 seasons.
The car was the first Brabham to use Alfa Romeo type 115-12 flat 12-cylinder engine with 500 hp and 340 Nm of torque. It was equipped with a Hewland six-speed transmission. It used the front air intakes of the previous Brabham, but by regulation no longer has the air-brooms behind the cockpit and has side panels with larger air intakes to feed the engine and more radiant surfaces. The frame was an aluminum monocoque, while the braking system was constituted by ventilated disc brakes produced by Girling. The front suspension consisted of double wishbones with pull-rods, coil springs and stabilizer bars, while the rear used coil springs and stabilizer bars. For the 1978 season, pending the development of BT46, a C version of the BT45 was created. This model was equipped with a revised radiator.
The BT45 had its first start at the 1976 Brazilian Grand Prix in the hands of Carlos Pace and Carlos Reutemann. They suffered reliability problems, especially the engine. During the first season, the best results were three fourth places.
1977 was better: Pace finished second in the first race and led for thirteen laps in South Africa with the BT45B, unluckily he died a few days later in a plane crash. His teammate, John Watson, drove to the pole at the Monaco Grand Prix but was passed on the first lap by Jody Scheckter's Wolf, after that he spent more than half of the race in second position, before retiring with gearbox problems. He then took second place in France, and Stuck gained two podiums, in Germany and Austria. Its results allowed the German to finish 11th overall in the Championship.
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