ISO 4055-1977 rus PDF

Full title and description

St ISO 4055-1977 rus — Road vehicles — Caravans and light trailers — Electromagnetic braking. Russian-language edition/translation of ISO 4055:1977 intended for use by manufacturers, test laboratories and regulatory bodies working with caravan and light-trailer electromagnetic brake systems.

Abstract

This standard (ISO 4055:1977) specifies the electrical characteristics and related performance requirements for electromagnetic braking systems fitted to caravans and light trailers. It defines system types and interchangeability conditions between towing and towed vehicles, and gives requirements for automatic application in the event of separation. The Russian edition (St ISO 4055-1977 rus) is a language adaptation of the original ISO first edition (1977).

General information

• Status: Withdrawn (original ISO edition withdrawn; Russian translation available as a historical/adopted document).
• Publication date: First edition published August 1977 (ISO reference: 1977-08 / first edition 1 August 1977).
• Publisher: International Organization for Standardization (ISO); Russian-language seller/adopter editions published electronically by standards distributors (St ISO 4055-1977 rus).
• ICS / categories: 43.040.40 — Braking systems (road vehicles).
• Edition / version: Edition 1 (1977). Russian-language edition corresponds to the 1977 first edition.
• Number of pages: 5 pages (original ISO publication length).

Scope

The standard applies to road trains made up of a towing vehicle and a caravan or light trailer whose maximum total weight does not exceed 3.5 t. It defines and gives values for the electrical characteristics of electromagnetic braking equipment (nominal 12 V systems), determines how braking performance depends on those characteristics, and sets conditions for interchangeability between towing and towed vehicles. It also covers requirements for automatic application and release of trailer brakes in the event of accidental separation.

Key topics and requirements

• Definition and specification of electrical characteristics for electromagnetic trailer brakes (nominal 12 V systems).
• Classification of system arrangements (examples: System A — current regulation on towing vehicle; System B — current regulation on trailer) and their functional principles.
• Determination of braking performance as a function of electrical characteristics and control signals.
• Interchangeability requirements so that trailers and towing vehicles remain compatible across manufacturers.
• Automatic application and release considerations for safety in case of accidental separation (mechanical or electrical actuation and release devices).

Typical use and users

Intended users include caravan and light-trailer manufacturers, braking-system and component suppliers, vehicle homologation and type-approval authorities, testing and certification laboratories, and engineers responsible for specifying or verifying trailer braking performance and electrical interfaces.

Related standards

Standards referenced or closely related to ISO 4055:1977 include ISO 611 (braking terminology), ISO 1724 and ISO 3732 (electrical connections between towing vehicles and trailers — types 12N and 12S), and other vehicle braking and connector standards used for compatibility and testing.

Keywords

electromagnetic braking; trailer brakes; caravan; light trailer; 12 V; current-regulating device; interchangeability; towing vehicle; automatic brake application; ISO 4055; Ст ISO 4055-1977 rus.

FAQ

Q: What is this standard?

A: ISO 4055:1977 is an International Standard that specifies electrical characteristics and functional requirements for electromagnetic braking systems used on caravans and light trailers. The "St ISO 4055-1977 rus" label indicates a Russian-language edition or translation of that 1977 ISO publication.

Q: What does it cover?

A: It covers the definition of electrical characteristics, braking-performance determination as a function of those characteristics, types of system arrangements (e.g., regulation mounted on towing vehicle or on trailer), interchangeability conditions between towing and towed vehicles, and requirements for automatic application/release in case of separation.

Q: Who typically uses it?

A: Manufacturers of caravans and light trailers, brake-system suppliers, test laboratories, certification bodies and vehicle-regulatory authorities use this standard for design, testing and compatibility checks.

Q: Is it current or superseded?

A: The ISO 4055:1977 first edition is withdrawn. Organizations may still reference it for legacy systems or when working from historical documentation; for current regulatory or design requirements, users should consult more recent ISO or regional standards and vehicle regulations. EVS records show withdrawal from 1 October 1986 and ISO metadata lists the standard as withdrawn.

Q: Is it part of a series?

A: It is a standalone ISO International Standard focused on electromagnetic braking for caravans/light trailers, but it cross-references and is used alongside other vehicle-braking and electrical-connection standards (for example ISO 611, ISO 1724, ISO 3732).

Q: What are the key keywords?

A: Electromagnetic braking, trailer brakes, caravan, light trailer, 12 V, interchangeability, current-regulating device, ISO 4055, Ст ISO 4055-1977 rus.