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Questions concerning the product

What advantage does the ETS Plus offer over similar products?

The ETS Plus operates in the opposite direction to the service brake, thus eliminating the undesirable addition of forces which can cause the wheels to lock and consequently the loss of cornering force. Stabilisation with the ETS Plus is achieved by means of a rack and pinion drive with freewheeling gear unit. In the event of the ETS Plus failing, due to a fuse blowing for example, it assumes a no-force state when the service brake is operated, thus ensuring that the brake remains operable at all times. This sophisticated gearing arrangement ensures that the brake does not overheat, and even that no disassembly of the system is required in the worst case scenario.

Where can I buy the ETS Plus?

It is possible to buy the ETS Plus directly from KNOTT or our internet site at as well as from large retailers.

Why is the housing made of plastic?

The material used for the housing is a fibre reinforced high performance plastic which suffers no corrosion problems whatsoever even under extreme conditions. This material has the same strength as an aluminium housing. The plastic housing also permits the integration of a transmitter for future applications – this would not be possible with a sheet metal housing.

Does the ETS Plus meet the requirements for 100 km/h approval?

The ETS Plus is designed as a pure emergency system. A permitted speed of 100 km/h depends on other factors so that an existing or pending 100 km/h approval is not affected.

Does the ETS Plus need to be serviced?

The ETS Plus is maintenance-free. An occasional visual inspection and cleaning to remove soiling is recommended.

On which Hobby models can the ETS Plus be retrofitted?

From 2017 for all hobby caravans. Prior to this the following applies: for all single-axle caravans, with tandems from 2016 only, except for types 690 to 770.

Can the ETS Plus be used on other trailers?

Yes, but it is necessary to bear in mind that the difference between the unladen weight and gross weight is limited. For further information contact our staff or visit our website.

Can the ETS Plus be used on AL-KO or BPW overrun braking systems?

The ETS Plus can be attached to AL-KO overrun braking systems for which complex tests have been performed together with the TÜV and a General Operating Licence has been obtained.
For BPW overrun braking systems, these tests have not been performed so that the ETS Plus cannot be attached to those.

Questions concerning operation

How does the ETS Plus work?

A sensor integrated in the housing permanently monitors the movements of the caravan and evaluates the data in real time with specially developed software. When the ETS Plus detects that the caravan begins to veer out, it initiates targeted braking of the caravan brakes in a fraction of a second, thus stabilising the car/caravan combination until it is safely brought under control.

What does the shut-down box do?

The purpose of the shut-down box is to shut down all consumers in the caravan while the ETS Plus is active. This reliably prevents the fuse blowing so that the stabilisation system remains operative at all times.

Are the wheels braked individually?

No, differentiated braking of individual wheels as on a car is not necessary. The rolling motion increases the load on the outer wheel, thus providing a large proportion of the deceleration effect. The resulting restoring moment forces the caravan (trailer) back on track.

Is there a remote display?

All the technical preconditions for a remote display have already been implemented and we will quickly introduce it after the market launch. The remote display will then be retrocompatible and retrofittable for all ETS Plus on the market.

Is there a system status indicator?

Yes, after a self-test that is carried out every time the system is plugged in or the ignition is switched on, detailed information on the system status can be read off indicated by an intelligent colour and flash code at the 2-colour LED.

Is an app already available?

All the technical preconditions for an app have already been implemented and we will quickly introduce it after the market launch. The app will then be retrocompatible and available for all ETS Plus on the market.

Does the brake light come on when the ETS Plus is active?

No, the ETS Plus brakes the car/caravan combination so smoothly that it is not necessary to activate the brake lights (comparable with engine brake).

How can I see the current operating or standby status of the ETS Plus?

Standby, fault status or stabilisation intervention are indicated by a 2-colour LED on the overrun hitch.

What about stone impact?

The ETS Plus sits behind the axle where it is well protected from stone impact. Practically no ground clearance is lost when the ETS Plus is installed. The housing made from glass fibre reinforced high performance plastic is resistant to stone impact and other commonplace loads.

What about water spray from the tyres?

The ETS Plus is hermetically sealed so that no dirt or water whatsoever can get into the housing. The housing seal has been verified in extensive environmental tests.

What about overheating protection?

The software is programmed in such a way that the brakes cannot overheat. This has been confirmed by TÜV tests.

Questions concerning the installation

How is the ETS Plus connected to the caravan´s electrical system?

The wiring harness pre-installed in the ETS Plus is routed through the cable duct in the caravan floor into the interior of the caravan. The distribution box must then be opened and the cables from the ignition and positive terminal looped through the supplied consumer shut-down box. The LED cable is then connected to the consumer shut-down box (with direct pcb plug) and routed to the cover.

How is the ETS Plus connected to the trailer´s electrical system?

The cable connected to the ETS Plus is routed to the trailer distribution box where it is connected to the LED cable. The two individual wires (red for 12V continuous positive, black for ground for continuous positive) must be connected to pin 9 (12V continuous positive) and pin 13 (ground for continuous positive) of the trailer.

Does the ETS Plus fit on any caravan?

The ETS Plus fits every single-axle caravan with a KNOTT inertia braking system. For tandem caravans, a brake linkage with central balancing on a square axle is required.

It can also be attached to all caravans with AL-KO overrun braking system.

Does the ETS Plus have to be registered in the vehicle papers/does it need testing authority approval?

No, the ETS Plus does not need testing authority approval. The installation and operating instructions must be kept together with the vehicle type approval.

How long does it take to install the ETS Plus?

An experienced technician can install the ETS Plus in about an hour.

Who can install the ETS Plus for me?

Installation can be carried out by a specialised dealer with a workshop.

How is the ETS Plus powered?

The ETS Plus is connected to the distribution box of the trailer where it is powered by the continuous positive of the 13-pin connector. Also see “How is the ETS Plus connected to the caravan’s electrical system?”

What is the power consumption of the ETS Plus?

When activated, the ETS Plus requires a maximum current of 15 A, made available with standard cable cross sections and fuse. When not activated, i.e. while driving steadily, the ETS Plus requires only 60 mA. When the trailer is stationary for a longer period of time, the ETS Plus will assume sleep mode and reduce the power consumption further to only 12 mA. The ETS Plus of course wakes up automatically when the trailer is restarted. You don’t need to do anything.

Can the ETS Plus also be used on trailers with 7-pin connectors or cars with only a 7-pin trailer socket?

Unfortunately no, as this system does not have a power supply via continuous positive for the ETS Plus.

Where does the indicator lamp (LED) need to be fitted?

In the area of the overrun hitch so that it can be observed during the hitch-up self-test.

Must I use the ETS Plus only in conjunction with the ANS (automatic adjustment)?

No, the ETS Plus can also be used for trailers with conventional brakes, but the ANS is highly recommended, as it significantly reduces the reaction time of the ETS Plus and allows the lurching caravan to straighten its course more quickly.