ISO 6315:1980

Overview

ISO 6315:1980 is an international standard published by the International Organization for Standardization (ISO) that specifies a test procedure for assessing corrosion-induced seizure between brake linings and ferrous mating surfaces in road vehicles. This standard focuses on laboratory methods to promote and evaluate corrosion bonding strength between brake linings (including drum brake linings and disc brake pads) and the corresponding cast iron or steel components they contact.

Brake seizure due to corrosion can significantly affect the safety and performance of vehicle braking systems by causing the brake linings to adhere to mating ferrous surfaces, which may impair brake function after vehicle standby in wet or corrosive environments. ISO 6315 provides a repeatable and standardized test method to ensure consistent evaluation and comparison of brake lining materials and manufacturing quality under corrosion conditions.

Key Topics

• Scope and Application
  The standard applies to both drum and disc brake linings used in road vehicles, for both new and used components. It covers the preparation, conditioning, testing, and evaluation stages needed to measure the bond strength caused by corrosion.

• Conditioning Environment
  Brake linings and mating surfaces are exposed to a controlled environment with approximately 95% relative humidity at 50°C for a specified duration to promote corrosion. This simulates the effects of exposure to wet weather conditions during vehicle parking, where brake components might remain stationary.

• Sample Preparation
  Samples include representative full-size brake linings or pads along with the corresponding ferrous mating surfaces (drum or disc). Surfaces are cleaned and conditioned under standardized procedures to ensure consistent manufacturing quality and test repeatability.

• Test Apparatus and Method
  The test setup includes devices to hold the brake lining assemblies under known pressure, such as clamps or weights, and instrumentation to measure the force required to release the lining from the mating surface after corrosion conditioning. For drums, the force applied is tangential, simulating rotational brake action; for discs, the force is applied radially.

• Measurement and Evaluation
  The critical metric recorded is the force or torque required to break the corrosion bond and cause slip between the lining and its mating surface. The test procedure ensures accurate, comparable results to assess adhesion due to corrosion.

• Test Reporting
  Comprehensive reporting protocols include details on lining size, type, condition (new or used), test sample count, mating surface details, and measured force values with ranges.

Applications

ISO 6315 is essential for manufacturers, testers, and quality assurance professionals in the automotive and brake component industries. Key practical applications include:

• Brake Material Development
  Designing brake linings with optimized resistance to corrosion-related seizure, improving vehicle safety and reliability.

• Quality Control
  Routine testing of brake lining batches to ensure consistent corrosion performance across production lots.

• Regulatory Compliance
  Meeting safety and durability requirements for brake components in various markets by demonstrating resistance to corrosion bonding.

• Vehicle Maintenance and Safety Assessments
  Evaluating used brake assemblies for potential corrosion risks that might impair brake operation after vehicle parking in humid environments.

Related Standards

• ISO/TC 22 - Road Vehicles Technical Committees
  ISO 6315 was developed by ISO/TC 22, which oversees standards related to vehicle systems including braking.

• Brake Performance and Materials Standards
  Other ISO standards on brake friction materials, wear, and thermal performance provide complementary information for holistic brake system evaluation.

• Corrosion Testing Standards
  General corrosion testing methods applicable to ferrous metals can offer supporting methodology for understanding material properties affecting brake interference.

Keywords

Brake linings, corrosion testing, ISO 6315, brake pad seizure, ferrous mating surface, drum brakes, disc brakes, adhesion test, road vehicles, brake material testing, brake component standard, brake safety, brake performance, humidity chamber test.