ISO 7633-1985 PDF

Full title and description

ISO 7633:1985 — Road vehicles — Elastomeric boots for drum type hydraulic brake wheel cylinders using a petroleum base hydraulic brake fluid (service temperature 120 °C max.). Specifies performance tests for moulded rubber boots used as end closures on drum-type brake wheel cylinders to prevent ingress of dirt and moisture and to protect brake operation.

Abstract

This standard defines performance test methods and requirements for elastomeric (rubber) boots fitted as end closures on drum-type hydraulic brake wheel cylinders for vehicles using petroleum-based hydraulic brake fluids. It applies to plain and reinforcement-insert boot types and excludes requirements on rubber compound chemical composition, tensile strength or elongation at break. The rubber is intended for use in the temperature range −40 °C to +120 °C.

General information

• Status: Published — International Standard (confirmed during periodic review, current as of 2021).
• Publication date: 1985 (Edition 1 — published July/August 1985; some catalogue entries list 25 July 1985).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.040.40 (Braking systems) and 83.140.50 (Seals).
• Edition / version: Edition 1 (1985).
• Number of pages: 4.

Scope

Applies to moulded elastomeric boots used as end closures on drum-type hydraulic brake wheel cylinders for road vehicles where a petroleum-base hydraulic brake fluid (in accordance with related fluid specifications) is used. Specifies performance tests (appearance, dimensional checks, function and ageing/compatibility tests under the stated temperature range) but does not set compound property limits such as chemical composition, tensile strength or elongation. Intended service temperature range is −40 °C to +120 °C.

Key topics and requirements

• Performance test methods for elastomeric boots used on drum brake wheel cylinders (visual, dimensional and functional tests; conditioning/ageing procedures where applicable).
• Applicability to both plain and reinforcement-insert boot types.
• Designed for use with petroleum-base hydraulic brake fluids and for service temperatures up to +120 °C (and down to −40 °C).
• Excludes prescriptive requirements on rubber compound chemistry, tensile strength or elongation at break and does not specify rubber-to-reinforcement adhesion criteria for reinforced boots.
• Referenced committee: ISO/TC 22/SC 33 (vehicle braking systems / seals).

Typical use and users

Used by automotive OEMs, brake-component suppliers, materials and rubber compound developers, test laboratories, certification bodies and maintenance/repair organizations to verify that elastomeric boots meet agreed performance criteria for drum brake wheel cylinders. Also used by standards engineers writing procurement specifications and by component designers to ensure compatibility with petroleum-base brake fluids and service temperatures.

Related standards

Part of a family of ISO standards for elastomeric seals and components for hydraulic brake systems (same technical committee). Relevant related standards include ISO 7630:1985 (elastomeric O-rings for drum brake wheel cylinders), ISO 7631:1985 (elastomeric cups and seals for hydraulic braking system cylinders) and ISO 7632:1985 (elastomeric seals for hydraulic disc brake cylinders). These companion standards specify test methods and requirements for other seal types and components used in braking systems.

Keywords

ISO 7633:1985; elastomeric boots; rubber boots; drum brake; wheel cylinder; hydraulic brake fluid (petroleum-base); performance tests; brake seals; −40 °C to +120 °C; ISO/TC 22/SC 33.

FAQ

Q: What is this standard?

A: ISO 7633:1985 is an international standard that specifies performance test methods for moulded elastomeric boots used as end closures on drum-type hydraulic brake wheel cylinders for vehicles using petroleum-base hydraulic brake fluid.

Q: What does it cover?

A: It covers test methods and performance requirements (appearance, dimensional checks, functional behaviour and conditioning/ageing) for plain and reinforcement-insert rubber boots intended for service between −40 °C and +120 °C. It explicitly does not set compound chemical-composition limits or tensile/elongation property values.

Q: Who typically uses it?

A: Automotive manufacturers, brake-component suppliers, test laboratories, standards committees, certification/approval bodies and maintenance organizations use this standard to specify and verify boot performance.

Q: Is it current or superseded?

A: The ISO bibliographic record shows ISO 7633:1985 was subject to periodic review and was confirmed (last confirmed in 2021), so the 1985 edition remains the current edition unless a subsequent revision has been published after that review. Users requiring absolute confirmation for procurement or regulatory purposes should verify the current status with the standards publisher before purchase.

Q: Is it part of a series?

A: Yes — it is one of a group of related ISO standards from the mid-1980s addressing elastomeric seals and components for hydraulic brake systems (for example ISO 7630, ISO 7631 and ISO 7632). These standards were developed by ISO/TC 22/SC 33.

Q: What are the key keywords?

A: Elastomeric boots; rubber boots; brake wheel cylinder; drum brakes; petroleum-base hydraulic brake fluid; performance tests; seal tests; ISO 7633:1985; brake components; −40 °C to +120 °C.