EN 17344:2020

SLOVENSKI STANDARD
01-maj-2020
Kmetijski stroji - Kmetijska in gozdarska vozila z lastnim pogonom - Zahteve za
zaviranje
Agricultural machinery - Self-propelled agricultural and forestry vehicles - Requirements
for braking
Landmaschinen - Selbstfahrende Arbeitsmaschinen - Anforderungen an Bremsanlagen
Matériel agricole - Véhicules agricoles et forestiers automoteurs - Exigences en matière
de freinage
Ta slovenski standard je istoveten z: EN 17344:2020
ICS:
65.060.01 Kmetijski stroji in oprema na Agricultural machines and
splošno equipment in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17344
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 65.060.01
English Version
Agricultural machinery - Self-propelled agricultural and
forestry vehicles - Requirements for braking
Matériel agricole - Véhicules agricoles et forestiers Landmaschinen - Selbstfahrende Arbeitsmaschinen -
automoteurs - Exigences en matière de freinage Anforderungen an Bremsanlagen
This European Standard was approved by CEN on 27 October 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17344:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Construction requirements . 10
5 Requirements regarding brake testing and performance . 19
Annex A (normative) Category of energy sources . 26
A.1 Pneumatic braking system . 26
A.2 Hydraulic braking system . 27
Annex B (normative) Capacity of energy storage devices . 28
B.1 Pneumatic energy storage devices . 28
B.2 Capacity of hydraulic storage devices . 28
Annex C (normative) Test report . 30
Bibliography . 38

European foreword
This document (EN 17344:2020) has been prepared by Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2020, and conflicting national standards shall
be withdrawn at the latest by month year of September 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document applies to braking systems for on-road use, installed on self-propelled agricultural and
forestry machinery. These vehicles are not primarily designed to pull heavy trailers or implements. For
this reason, this standard does not contain provisions for assisted trailer braking control. Information
about such systems can be found in EU Regulation 2015/68, last amended by 2018/828, or in UNECE
Regulation No. 13, or in any national legislation dealing with braking systems on vehicles.
This document can be used during an EU or national type approval process for self-propelled agricultural
or forestry machines.
The sources of this document are, among others:
— EU Regulation 2015/68, as last amended by 2018/828;
— ISO 10998:2008 Agricultural tractors – Requirements for steering.
1 Scope
This document applies to wheeled and/or track-laying self-propelled agricultural and forestry vehicles
when used on public roads. It specifies the definitions, construction and performance requirements and
the means for verification of braking systems on vehicles with a maximum design speed not
exceeding 60 km/h.
Following items are excluded from the scope of this document:
— coupling force control;
— endurance braking systems;
— Anti-Lock Braking Systems and EBS;
— vacuum braking systems;
— safety related parts of complex electronic control systems;
— trailer braking control systems.
NOTE For assisted trailer braking the EU Regulation 2015/68 can be used but before including these
requirements into this document, an additional review of 2015/68 is needed.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 9128:2006, Road vehicles — Graphical symbols to designate brake fluid types
ISO 3767-1:2016, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment — Symbols for operator controls and other displays — Part 1: Common symbols
ISO 3583:1984, Road vehicles — Pressure test connection for compressed-air pneumatic braking equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
braking system
combination of parts whose function is to reduce progressively the speed of a moving vehicle or to bring
it to a halt, or to keep it stationary if it has already halted
Note 1 to entry: the system consists of the control device, the transmission and the brake
3.2
brake
part in which the forces opposing the movement of the vehicle develop
Note 1 to entry: This may be a friction brake, or an electrical brake, or a fluid brake, or an engine/transmission
brake
3.2.1
friction brake
brake where the braking forces are generated only by the friction brakes without taking into account of
the braking effect of the stepless drive braking system
3.2.2
fluid brake
brake where the braking forces are generated by the action of a fluid situated between two parts of the
vehicle moving relatively to one another
3.2.3
electrical brake
brake where the braking forces are generated by electromagnetic action between two parts of the vehicle
moving relatively to another but not in contact with one another
3.2.4
engine brake
brake where the forces are generated by a controlled increase of the braking action from the engine which
remains connected with the wheels or tracks by the transmission
3.3
service braking system
braking system that enables the driver to control the movement of the vehicle and to halt it safely,
speedily and effectively, for all the range of speed and load that the vehicle is approved to operate, on any
up or down gradient
3.4
graduated braking
braking which, within the normal range of operation of the equipment, during either the application or
the releasing of the brakes, fulfils all the following conditions:
— the driver can, at any time, increase or reduce the braking force through action of the control
device; and
— it is easily possible to make a sufficiently fine adjustment to the braking force
3.5
control device
device actuated directly by the driver to supply to the transmission the energy required for braking or
controlling it. This energy may be the muscular energy of the driver, or energy from another source
controlled by the driver or in appropriate cases the kinetic energy of a towed vehicle, or a combination
of these various kinds of energy
3.6
transmission
combination of components comprised between the control device and the brake, and linking them
functionally through mechanical, hydraulic, pneumatic or electric means or through the use of a
combination of those means; where the braking power is derived from or assisted by a source of energy
3.7
parking braking system
system that enables the vehicle to be held stationary on an up or down gradient even in the absence of
the driver
3.8
secondary braking system
means the braking system that allows the driver to halt the vehicle within a reasonable distance in the
event of a failure of the service braking system
3.9
inertia braking
braking by utilizing the forces generated by the towed vehicle's moving up on the towing vehicle
3.10
laden vehicle
vehicle laden at its technically permissible maximum laden mass as declared by the manufacturer for on
road operation
3.11
unladen vehicle
vehicle with its mass in running order for road operation
Note 1 to entry: This includes the coupling device(s), coolants, oils, liquids necessary for road circulation, fuel
and DEF (Diesel Emission Fluid) tanks, if provided and filled minimum 90 % and a driver of 75 kg
[SOURCE: UNECE R.E.3]
3.12
axle load
sum of the vertical static forces of the road surface in the contact area on the wheels of the axle
3.13
maximum stationary axle load
stationary axle load achieved under the condition of the technically permissible maximum laden mass of
the vehicle
3.14
towed vehicle
agricultural trailer or an interchangeable towed equipment
3.15
attachment trailer
any towed vehicle which is designed to be towed by a self-propelled vehicle, and only intended to carry
the attachment of its towing vehicle during road operation (for example harvesting attachment)
3.16
spring compression chamber
chamber where the pressure variation that induces the compression of the spring is actually produced
3.17
energy source
device that provides the energy required to actuate the brakes, either directly or indirectly through an
energy storage device
3.18
energy storage device
device that stores the energy provided by the energy source to apply or release the brakes
3.19
energy reserve
pneumatic, hydraulic or electric energy that is stored in an energy storage device
3.20
technically permissible maximum laden mass
maximum laden mass declared by the manufacturer on the basis of its construction features and design
performances, irrespective from the load capacity of the tyres or tracks
3.21
technically permissible maximum mass per axle
mass corresponding to the maximum permissible static vertical load transmitted to the ground by the
wheels of the axle or the tracks, on the basis of the construction features and of the vehicle and their
design performances, irrespective from the load capacity of the tyres
3.22
brake assisted steering function
system allowing to brake a single wheel on one axle, by means of two separate controls, with the aim to
shorten the turning radius during off-road use
3.23
measured maximum design speed
measured speed
...