ISO 7632-1985 PDF

Full title and description

Road vehicles — Elastomeric seals for hydraulic disc brake cylinders using a petroleum base hydraulic brake fluid (service temperature 120 °C max.). Specifies performance test methods and requirements for elastomeric seals used in hydraulic disc brake cylinders (solid-section types such as square, rectangular and O‑ring profiles), including test apparatus, specimen preparation and required test procedures and criteria.

Abstract

This International Standard defines the required test methods and performance criteria for elastomeric seals intended for use in hydraulic disc brake cylinders that use a petroleum‑based hydraulic brake fluid, with a maximum service temperature of 120 °C. It applies to seals mounted either stationary in the cylinder bore or on the movable piston and describes the apparatus, conditioning and individual test procedures and acceptance requirements.

General information

• Status: Published; reviewed and confirmed (remains current as of ISO review).
• Publication date: 1985 (Edition 1, June 1985).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.040.40 (Braking systems) / 83.140.50 (Seals).
• Edition / version: Edition 1 (1985).
• Number of pages: 6.

Scope

Applies to solid‑section elastomeric seals (square, rectangular, O‑ring type) used in hydraulic disc brake cylinders that operate with petroleum‑base hydraulic brake fluids at service temperatures up to 120 °C. The standard covers required test apparatus, specimen preparation, conditioning procedures, performance tests (ageing, compatibility, dimensional and physical property tests) and acceptance criteria for these seals.

Key topics and requirements

• Definition of seal types and mounting configurations (stationary in bore or on movable piston).
• Material compatibility and conditioning with petroleum‑based hydraulic brake fluids.
• Specified test apparatus and specimen preparation methods.
• Mechanical and physical tests (hardness, tensile/elongation where applicable, compression set and dimensional stability).
• Aging and thermal endurance tests up to the stated service temperature (120 °C).
• Swelling/compatibility and leakage or fit assessment following conditioning.
• Pass/fail criteria and reporting requirements for test results.

Typical use and users

Used by automotive OEMs, brake component and seal manufacturers, independent testing laboratories, quality and materials engineers, and regulatory or certification bodies involved in braking system component approval and procurement. It provides a common set of test methods and acceptance criteria for design validation, supplier qualification and routine quality control.

Related standards

Relevant or adjacent standards include other ISO vehicle‑related standards on braking components and diagnostic/connector specifications (examples: ISO 7639 on diagnostic graphical symbols and national/adopted versions such as DIN ISO 7632 for identical adoption). Users should consult the body of ISO/TC 22 standards for complementary requirements and any later revisions or related parts.

Keywords

elastomeric seals, disc brake cylinder, hydraulic brake fluid, petroleum base, test methods, compression set, ageing, compatibility, service temperature 120 °C, ISO 7632:1985

FAQ

Q: What is this standard?

A: ISO 7632:1985 is an International Standard that specifies test methods and performance requirements for elastomeric seals used in hydraulic disc brake cylinders operating with petroleum‑based hydraulic brake fluid (service temperature up to 120 °C).

Q: What does it cover?

A: It covers seal types (solid‑section: square, rectangular, O‑ring), specimen preparation, conditioning, the required test apparatus and step‑by‑step test procedures (aging, compatibility, dimensional and physical property tests) and acceptance criteria for those seals.

Q: Who typically uses it?

A: Automotive OEMs, brake and seal manufacturers, independent testing and certification laboratories, procurement and quality engineers, and standards bodies responsible for component conformity and safety testing.

Q: Is it current or superseded?

A: The 1985 edition (Edition 1) is listed as published and was reviewed/confirmed in ISO’s review process (confirmed in a recent review cycle), so the 1985 text remains the current edition unless a newer revision is published.

Q: Is it part of a series?

A: It belongs to the set of ISO standards developed under ISO/TC 22 for road vehicles and related subcommittees addressing braking systems and components. There are related ISO entries covering other brake‑related components and diagnostic specifications (see related standards above).

Q: What are the key keywords?

A: Elastomeric seals, hydraulic disc brake, petroleum‑based hydraulic fluid, test methods, ageing, compatibility, compression set, 120 °C, ISO 7632:1985.