1、 FORD LABORATORY TEST METHOD AM 153-01 Date Action Revisions Rev. 1 2011 03 11 Revised Added note for isopropyl alcohol use. 2010 12 02 Activated A. Wedepohl, NA Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 1 of 2 PETROLEUM OIL CONTAMINATION OF BRAKE FLUID DETER
2、MINED BY IMMISCIBILITY Application This procedure is used to detect petroleum oil contamination above 0.05% in hydraulic brake fluid. The method is valid for all types of brake fluid except silicone. Apparatus and Materials Required 250 ml graduated mixing cylinder and stopper or stoppered measuring
3、 cylinder 100 ml graduated cylinder 75 ml methyl alcohol (Methanol) 99.85% pure with water content 0.1% Note: For locations where methanol is prohibited by law, isopropyl alcohol (2-propanol) with 0.1% water can be substituted for methanol. The detection limit for naphthenic oils may be higher 0.05
4、 0.1%) 25 ml distilled or de-ionized water Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Procedure 1. Mix 75 ml methyl alcohol and 25 ml of deionzed water
5、 into a 250 ml graduated mixing cylinder. 2. Add 100 ml of the brake fluid sample to be tested. 3. Insert stopper and rock back and forth 5 times to mix. 4. Entrained air bubbles will be present and rising to the surface. Larger air bubbles will disappear within 30 seconds. Smaller bubbles and oil g
6、lobules will rise to the surface and clear within 2 minutes. Evaluation Any of the following results indicates the brake fluid sample is contaminated with petroleum oil in an amount greater than 0.05% by volume. 1. Oil globules visible in the fluid after 30 seconds and before 2 minutes. Figure 1. 2.
7、 Droplets or an oily sheen present on the surface after 2 minutes. Figure 2. 3. A change to a cloudy or milky appearance. 4. If the transport containers have clear sides, gelatinous droplets visible at the fluid level line are a sign of contamination, Figure 3. Note: Oil is lighter than brake fluid
8、and may cling to the sides of the container at the surface. Due to the fact that the droplets remain in the container they would not be included in the fluid sample on test and thus their presence is also an indication. If the solution remains clear with no oily sheen on the surface and free of oil
9、globules, the brake fluid is free of petroleum contaminants. FORD LABORATORY TEST METHOD AM 153-01 Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 2of 2 Figure 1. Oil globules visible in the fluid column. Figure 2. Droplets or an oily sheen present on the surface. Figure 3. Gelatinous droplets visible at the fluid level line of the brake fluid sample transport container.
