Mercedes-Benz and the invention of the anti-lock braking system: ABS, ready for production in 1978

Stuttgart, Jul 1, 2008
In August 1978 Mercedes-Benz presented the second-generation anti-lock braking system (ABS), developed together with Bosch, to the press in Untertürkheim. The world-first enables a driver to retain steering control even during emergency braking. From December the innovation became available, initially in the S-Class sedans (116 series).
Eight years before, in 1970, the first-generation anti-lock braking system for passenger cars, a system that had been developed together with TELDIX, had its world premiere. ABS is thus an example of the great staying power sometimes required to bring a product up to production standard – a responsibility which the Mercedes-Benz brand takes upon itself again and again with its numerous innovations.
Development over decades
An anti-lock braking system had been on the automotive engineers' list of wishes for decades – it was, after all, expected to improve handling safety drastically by retaining steerability during braking. As early as 1928 the German Karl Wessel had been granted a patent on a braking force regulator for automobiles, but this design only existed on paper.
In 1941, an anti-lock regulator was tested with which, however, "only modest successes were achieved," as the "Automobiltechnisches Handbuch" (Automotive Engineering Manual) reported.
Nevertheless, these first attempts set the course: an anti-lock braking system had to have sensors for measuring the speeds of each front wheel, as well as a control unit for recording and comparing the data measured by the sensors. This control unit was to correct excessive deviations by individually controlling the brake pressure at every wheel up to the point at which the wheel is about to lock.
However, the transfer of the idea into hardware for use on the road proved to be significantly more difficult than expected. The sensors did work satisfactorily as early as 1952, in an anti-skid system for aircraft, and in 1954 in a Knorr braking system for railways.
But in the car, the demands on the mechanical friction wheel sensors were much higher: they had to register decelerations and accelerations in wheel speeds, they had to react reliably in corners and on rough ground and work perfectly even when heavily soiled and at high temperatures.
Induction instead of mechanics
The problem was tackled not only by Daimler-Benz engineers but also at TELDIX GmbH in Heidelberg. The two companies did not make any headway with mechanical sensors, so they had to look for another, new solution.
In 1967, they came up with a solution to the problem in a joint effort – in the form of contactless speed pickups which operate on the principle of induction. Their signals were to be evaluated by an electronic unit which controlled brake pressure via solenoid valves.
At the time, electronics still worked on the basis of analogue technology which was relatively susceptible to failure and consisted of complicated circuitry. Integrated modules did not yet exist. And yet, this proved to be a first, promising approach.
For this reason, Daimler-Benz introduced this first generation of an anti-lock braking system for cars, trucks and buses to the public on the test track in Untertürkheim on December 12, 1970 – with a resounding echo by an enthusiastic expert world and press. The principle had been found to be convincing.
Development of the production ABS
Another eight years passed before Daimler-Benz was able to offer a reliably functioning anti-lock braking system for production cars; this time was required to give the prototype the degree of technical maturity and reliability that is indispensable for large-scale production. In development, the engineers benefited from the revolution in electronics. It was not until the invention of integrated circuits that small, robust computers could be built, capable of recording wheel sensor data in next to no time and reliably actuating the valves for adjusting brake pressure.
It took development partner Bosch five years to supply the first digital control unit to Untertürkheim for test purposes. Digital instead of analogue: this meant fewer components with the advantage of the risk of malfunction being reduced down to virtually zero.
Thanks to digital technology, the electronic components were capable of recording, comparing, evaluating and transforming sensor data into governor pulses for the brakes' solenoid valves within milliseconds. What's more, not only the front wheels but also the rear wheels were included in the control operations.
1978: The world's first production ABS
Thus, it had taken a long, long time before Mercedes-Benz became the world's first motor manufacturer in August 1978 to officially launch the second-generation anti-lock braking system and to offer it as an option from December 1978 – initially in the S-Class at a surcharge of DM 2,217.60. Since 1984, ABS has been standard equipment on Mercedes-Benz passenger cars. Ten years after the introduction, as many as one million Mercedes-Benz cars with ABS were being operated on the roads throughout the world.
Mercedes-Benz also adopted a pioneering role where ABS for commercial vehicles was concerned. As early as 1981 ABS was offered for compressed-air brakes, a joint development with Wabco. ABS has been standard equipment on all touring coaches of the brand since 1987 and on all trucks of the brand since 1991. In late 1990, ABS also found its way into the Mercedes-Benz racing cars for the German Touring Car Championship.
Basis for innovations
ABS development never stops. The complete control system is becoming ever smaller, ever more effective, ever more robust. The initial, typical pulsating of the brake pedal, indicating ABS activation, has largely been eliminated today. However, the system not only optimally decelerates the car and retains its steerability, it also serves as the basis and pulse generator for the acceleration skid control (ASR) system, the Electronic Stability Program ESP®, the Brake Assist and of course also for the electro-hydraulic brake system, Sensotronic Brake Control (SBCTM).
In Mercedes-Benz passenger cars, the wheel sensor data also serves less conspicuous functions in that it is, for instance, processed by the electronically controlled automatic transmission that adjusts to the driver's wishes, the navigation computer, the DISTRONIC proximity control, the engine and windshield wiper control, the active suspension control (ABC), 4MATIC – in short, by everything in the car that is controlled on the basis of speed. The same naturally applies to trucks and buses.
Anti-lock braking system is a matter of course throughout the world today
If the anti-lock braking system is today taken for granted in virtually all cars of the majority of automotive brands throughout the world, we owe this to the commitment of the large number of engineers and technicians at Daimler-Benz and cooperation partners Bosch, TELDIX and Wabco, who searched for the best solution for this system which improves handling safety, avoids accidents and saves lives.
This is what Heinz Leiber, the then head of ABS development at Daimler-Benz and also called the "Father of ABS", has to say: "The anti-lock braking system – and with it Mercedes-Benz – was also a pioneer in automotive digital electronics."


ABS pioneer: Mercedes-Benz coupe from the 114 series with anti-lock brake system (ABS) by Teldix on the Untertürkheim test circuit in 1970. Fitted with ABS, the car remains on course under braking in corners. Without ABS, the car is liable to skid off course if braking is too abrupt.
Better braking: Compact Mercedes-Benz sedans from the 201 series with and with-out anti-lock braking system (ABS) on the test track in Stuttgart-Untertürkheim, 1978.
Commercial vehicles included: After the world premiere in passenger cars in 1978, Mercedes-Benz presented the anti-lock braking system in a touring coach in 1979.
Evasive action: The anti-lock braking system retains the vehicle’s full steerability even during an emergency braking maneuver. Mercedes-Benz presented the system for passenger cars in 1978.
Mercedes-Benz TELDIX anti-lock braking system. When decelerated on a corner, the car with anti-lock braking system remains precisely on course. Without anti-lock braking system, the car skids off course when too much pressure is applied to the brake pedal.
Mercedes-Benz TELDIX anti-lock braking system. When decelerated on a corner, the car with anti-lock braking system remains precisely on course. Without anti-lock braking system, the car skids off course when too much pressure is applied to the brake pedal.
The anti-lock braking system that was jointly developed by Daimler-Benz and Bosch complements the conventional brake system and first and foremost consists of rotational-speed sensors on the two front wheels as well as on the drive pinion of the rear axle, an electronic control unit and a hydraulic unit.
Mercedes-Benz anti-lock braking system: When braking on corners, the anti-lock braking system retains the car’s directional stability and steerability provided the physically possible cornering speed is not exceeded.
Mercedes-Benz TELDIX anti-lock braking system. Equipped with anti-lock braking system, the blue car comes to a standstill after some 40 meters when decelerated from a speed of 100 km/h. The white car with conventional brakes has a stopping distance of some 50 meters and crashes through the artificial wall.
Mercedes-Benz TELDIX anti-lock braking system. Layout of components of the anti-lock braking system in the car: 1. front wheel sensors, 2. hydraulic unit, 3. electronic control unit, 4. rear wheel sensors.
Mercedes-Benz TELDIX anti-lock braking system. Equipped with anti-lock braking system, the car remains on course and steerable even under emergency braking. The driver is able to avoid an obstacle. The skid marks of the car without anti-lock braking system on the right-hand side show that the wheels lock under braking.
The electronic control unit of the anti-lock braking system that was jointly developed by Daimler-Benz and Bosch.
Mercedes-Benz S-Class, model series 116 (1972 to 1980), with and without anti-lock braking system (ABS) on the test track in Stuttgart-Untertürkheim. Photo from 1978. It was in this vehicle that Mercedes-Benz introduced ABS in large-scale production, making it the first manufacturer in the world to do so.
Mercedes-Benz S-Class saloons (model series 116) at the test track in Stuttgart-Untertürkheim, 1978. The upper vehicle with anti-lock braking system (ABS) remains steerable, while the lower vehicle without ABS continues to slide uncontrollably, despite the front wheels being at full lock.