Skip to main content Skip to page footer

Questions about the product

The patented cable actuation prevents the addition of forces when the stabilisation system and overrun braking system are engaged at the same time, which would lead to the wheels locking and thus to a loss of lateral guidance force.

The stabilisation on the ETS Plus is achieved via a freewheel gearbox through a toothed rack. In the event of total failure of the ETS Plus, e.g. a blown fuse, it is forced into a force-free state when the service brake is applied and the brake remains ready for use at any time. This ingenious gear arrangement reliably prevents the brake from overheating.

They can be purchased directly from KNOTT on our website as well as from reputable wholesalers.

The housing material is a fibre-reinforced high-performance plastic, which has no corrosion problems even under extreme conditions. It has the same strength as aluminium housing. The plastic housing also allows the integration of a transmitter for an upcoming task, which would not be possible with a sheet metal housing.

The ETS Plus is designed as a pure emergency system. A Tempo 100 approval is dependent on other factors, so an existing or still to be carried out Tempo 100 approval is not affected.

The ETS Plus is maintenance-free. Only an occasional visual inspection and cleaning in case of coarse soiling is recommended.


From 2017 for all Hobby caravans. Before that: for all single-axle caravans, for tandems only from 2016 except for types 690 and 770.

Yes, but it is important to note that the difference between the unloaded weight and the max. weight must not be arbitrarily large. You can get information from our employees.

The ETS Plus can be fitted to AL-KO overrun brake systems, for which extensive tests were carried out, and TÜV and an ABE were obtained.

These tests were not carried out for BPW overrun braking systems, so installation is not possible here.

Questions about the function

A sensor integrated in the housing permanently monitors the movements of the caravan and evaluates the data in real-time using specially developed software. If a lurch is detected, the ETS Plus initiates a targeted braking process on the trailer brake in a fraction of a second, thereby stabilising the caravan until a safe driving condition is reached.

The switch-off box causes all consumers in the caravan to be switched off when the ETS Plus is in use. This reliably prevents the fuse from blowing and the stabilisation system remains ready to use at all times.


No, it is not necessary to differentiate the braking of individual wheels as in a car is not necessary. The rolling motion increases the wheel load on the outer wheel and thus takes over a major part of the deceleration. The self-aligning torque forces the trailer back into the correct lane.

All the basic technical requirements for a remote display have already been implemented and we will work on this very quickly after the market launch. The remote display will then also be backwards compatible and retrofittable for all ETS Plus on the market.

Yes, after a self-test, which is carried out every time the ignition is plugged in or switched on, detailed information on the system status can be read off via an intelligent "colour and flash code" on the two-colour LED.

All the basic technical requirements for an app have already been implemented, and we will work on this very quickly after the market launch. The app will then also be backwards compatible and retrofittable for all ETS Plus on the market.

No, the ETS Plus brakes the vehicle combination so gently that it is not necessary to activate the brake lights. (cf. engine brake)

The readiness for operation or error states or the stabilisation intervention is indicated via the 2-colour LED on the overrun device.

The ETS Plus is installed behind the axle, where is well protected from stone chips. When mounting the ETS Plus, practically no ground clearance is lost. The housing is made of fibre-reinforced high-performance plastic and is resistant to stone chips and other known stresses.

The ETS Plus is hermetically sealed so that no dirt or water can penetrate the housing. The tightness has been confirmed in extensive environmental tests.

The software is programmed so that the brakes cannot overheat. This has been proven with tests at the TÜV.

Questions about installation

The cable harness pre-mounted in the ETS Plus is routed into the caravan interior via the cable entry already present in the floor of the caravan. Then the distributor box must be opened and the cables from the ignition and continuous plus must be looped through the consumer cut-off supplied. Finally, connect the LED cable to the consumer switch-off (with PCB direct plug) and route it to the cover.

The cable pre-mounted on the ETS Plus is laid to the trailer distributor and connected there with the LED cable. The two individual wires (red for 12V continuous plus, black for ground continuous plus) must be connected to pin 9 (12V continuous plus) and pin 13 (ground continuous plus) of the trailer.

The ETS Plus fits any single-axle caravan with KNOTT overrun brake system. For tandem caravans, a brake linkage with central compensation on a square axle is required.

It can also be fitted to all caravans with AL-KO overrun brake system.

No, no demonstration at the TÜV is necessary. However, the installation and operating instructions must be carried with the ABE.

The installation takes about one hour with trained personnel.

Installation can be carried out by a specialized shopwith an attached workshop.

The ETS Plus is connected to the distribution box of the trailer and supplied with power via the permanent plus of the 13-pin connector.

See also "How is the ETS Plus connected to the caravan's electrical system?

The ETS Plus requires a maximum of 15A when triggered, which can already be provided with the standard cable cross-sections or the usual fuse protection. When not triggered, e.g. during quiet driving, the ETS Plus only requires 60 mA. If the trailer is stationary for a longer period of time, the ETS Plus goes "to sleep" after a while and reduces the current consumption to only 12 mA. Of course, the ETS Plus wakes up automatically when the trailer continues to move. You do not need to do anything here.

Unfortunately no, because there is no power supply via continuous plus for the ETS Plus here.

In the area of the run-up entry direction, so it may be observed during the self-test during the coupling process.

No, the ETS Plus can also be used on trailers with conventional brakes, but the ANS is highly recommended as it significantly reduces the reaction time of the ETS Plus and can bring the lurching trailer back on track more quickly.