| 摘要 |
<p>A reactive test strip (10) having a pre-exposure color is used to measure and indicate the concentration of copper ions in brake fluid in terms of a readily visible color change. The strip is immersed in the fluid within a brake fluid container (30) and any resulting color change is compared to a color chart (20) and a known test standard representative of the maximum concentration determined empirically to correspond to a boiling point considered safe for normal operation. If the color change indicates a higher copper concentration, then the fluid is considered inadequate for safe operation and thus recommended for replacement without further tests. Similar copper or metal strips can also be used to determine iron or zinc concentration. An automated embodiment of the invention includes an optical instrument to compare the color obtained during the test against a predetermined test standard and determine whether a brake fluid change is recommended.</p> |
