ISO 7630-1985 PDF

Full title and description

St ISO 7630-1985 — Road vehicles — Elastomeric O-rings for hydraulic drum brake wheel cylinders using a petroleum base hydraulic brake fluid (service temperature 120 °C max.). This standard specifies performance test methods and requirements for solid elastomeric O-ring seals used in wheel cylinder applications in drum brake systems.

Abstract

Specifies performance test methods and minimum requirements for elastomeric O-rings intended for hydraulic drum brake wheel cylinders that operate with a petroleum (mineral) base hydraulic brake fluid. Applies to solid O-ring seals mounted either stationary in the cylinder bore or on the movable piston and covers suitability for service temperatures from −40 °C up to +120 °C.

General information

• Status: Published (International Standard; confirmed on systematic review).
• Publication date: June 1985 (Edition 1, 1985-06).
• Publisher: ISO — International Organization for Standardization.
• ICS / categories: 43.040.40 (Braking systems), 83.140.50 (Seals).
• Edition / version: Edition 1 (1985). Confirmed by ISO review cycles (last confirmation recorded 2021).
• Number of pages: 5.

Scope

The standard applies to solid elastomeric O-rings used as seals in hydraulic drum brake wheel cylinders where a petroleum (mineral) base hydraulic brake fluid is used. It defines the required performance characteristics and associated test methods to ensure reliable sealing over the service temperature range −40 °C to +120 °C and in contact with the specified brake fluid. The scope covers O-rings mounted either stationary in the cylinder bore or on the movable piston of drum brakes.

Key topics and requirements

• Performance test methods and pass/fail requirements for elastomeric O-rings used in wheel cylinders.
• Compatibility with petroleum (mineral) base hydraulic brake fluids.
• Service temperature suitability: operation from −40 °C up to +120 °C (120 °C max.).
• Application to solid O-ring seals mounted either stationary in the cylinder bore or on a movable piston.
• Non-prescriptive on compound chemistry (focuses on performance outcomes rather than detailed material composition requirements).

Typical use and users

Primary users include automotive component manufacturers (brake-system and seal suppliers), original equipment manufacturers (OEMs) for passenger cars and light commercial vehicles, quality and test laboratories performing seal qualification, procurement and compliance teams verifying component conformity, and regulatory or certification bodies assessing braking-system components.

Related standards

Standards related by subject or committee include ISO 7631:1985 (Elastomeric cups and seals for cylinders for hydraulic braking systems using a petroleum base hydraulic brake fluid) and other ISO road-vehicle braking and sealing standards. These related documents address complementary seal types, test methods and graphical/technical conventions for road-vehicle systems.

Keywords

ISO 7630:1985; elastomeric O-ring; wheel cylinder seal; hydraulic drum brake; petroleum base hydraulic brake fluid; service temperature 120 °C; brake seals; test methods; automotive seals.

FAQ

Q: What is this standard?

A: ISO 7630:1985 is an International Standard that defines performance tests and requirements for solid elastomeric O-rings used in hydraulic drum brake wheel cylinders when a petroleum (mineral) base hydraulic brake fluid is used.

Q: What does it cover?

A: It covers the intended application (wheel cylinder O-ring seals), required performance characteristics, and associated test methods to confirm suitability for use with petroleum base hydraulic brake fluid and within the service temperature range −40 °C to +120 °C.

Q: Who typically uses it?

A: Seal and brake-component manufacturers, automotive OEMs, testing and qualification laboratories, procurement and compliance teams, and regulators/certification bodies concerned with braking-system components.

Q: Is it current or superseded?

A: ISO 7630:1985 remains a published International Standard and was confirmed following ISO systematic review processes; ISO records indicate the edition was confirmed in periodic reviews (confirmation noted in 2021). Users should verify national adoption or any subsequent amendments before relying on it for compliance.

Q: Is it part of a series?

A: It is part of a family of ISO documents addressing elastomeric seals and braking-system components for road vehicles (for example ISO 7631:1985 for cups and seals); related standards cover complementary seal types and test procedures.

Q: What are the key keywords?

A: Elastomeric O-rings, wheel cylinder, hydraulic drum brake, petroleum base hydraulic brake fluid, service temperature, seal performance, ISO 7630:1985.