Overview
ISO 6119:2006 establishes standardized test methods and minimum performance requirements for elastomeric seals used in the hydraulic disc brake cylinders of road vehicles, specifically where non-petroleum base hydraulic brake fluid is used. Designed for seals exposed to service temperatures up to 120 °C, this standard applies to solid section seals such as square, rectangular, and O-rings, whether mounted stationary in the cylinder bore or on the movable piston. By specifying detailed testing protocols and product acceptance criteria, ISO 6119:2006 supports the manufacturing and quality assurance of reliable brake systems in the automotive sector.
Key Topics
- Scope: Applies to elastomeric seals for road vehicle disc brake cylinders using non-petroleum base fluids (like DOT 3, DOT 4, or DOT 5.1), and covers seals for both stationary and moving components.
- Product Requirements:
- Seals must strictly conform to standardized drawings and be free from defects such as cracks, blisters, pinholes, embedded foreign matter, or irregularities detectable by inspection.
- Suitable for continuous operation in a temperature range from −40 °C to +120 °C.
- Performance Test Methods:
- Resistance to Fluid at Elevated Temperature: Assesses changes in volume and hardness after exposure to brake fluid at 120 °C.
- Precipitation Characteristics: Measures sediment formation in brake fluid after seal exposure, limiting possible contamination.
- Dry Air High-Temperature Resistance: Evaluates hardness and physical integrity after oven aging.
- Stroking Tests: Simulates operational cycles at ambient and high temperatures to ensure no leakage or excessive wear.
- Low-Temperature Leakage Test: Ensures seals remain flexible and do not crack at temperatures as low as −40 °C.
- Corrosion and Humidity Testing: Exposes seals to high humidity and temperature cycles to confirm corrosion resistance and material stability.
- Test Fluids:
- Uses reference brake fluids as defined by ISO 4926 for compatibility and corrosion tests.
Applications
ISO 6119:2006 plays a critical role in the design, manufacturing, and qualification of road vehicle disc brake systems that utilize non-petroleum-based hydraulic fluids. Its application ensures:
- Quality Assurance: Allows manufacturers to validate the durability and compatibility of elastomeric seals under severe operational conditions, reducing the risk of brake failure.
- Safety Compliance: Enables automotive OEMs and component suppliers to meet international safety and reliability standards, supporting global automotive trade.
- Material Selection & Compatibility: Guides engineers in selecting elastomer formulations that maintain integrity when exposed to non-petroleum brake fluids at a wide range of temperatures.
- Product Development: Serves as a benchmark for R&D, helping manufacturers innovate brake seal designs while ensuring compliance.
- End-user Confidence: Provides assurance to vehicle owners and maintenance professionals that brake components meet critical performance and safety benchmarks.
Related Standards
Organizations seeking to implement ISO 6119:2006 may also need to reference additional standards to ensure complete compliance and integration across brake system components, such as:
- ISO 48: Specifies methods for determining the hardness of rubber, essential for evaluating seal integrity.
- ISO 188: Outlines procedures for accelerated aging and heat resistance in rubbers.
- ISO 1817: Provides guidelines for assessing the effect of liquid exposure on rubber materials.
- ISO 4926: Defines reference fluids for testing compatibility in hydraulic brake systems.
- ISO 4928: Sets specifications for elastomeric cups and seals in hydraulic braking systems operating with non-petroleum-based fluids.
By adhering to ISO 6119:2006 and its related standards, manufacturers and suppliers enhance product reliability, safety, and international market access, while supporting the continued advancement of brake technology for modern road vehicles.
Open preview (PDF)Road vehicles — Elastomeric seals for hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid (Service temperature 120 degrees C max.)