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The Gentleman's Express: Tech-Tips from the JIOC

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Change to Castrol Brake Fluid GT LMA

Author: Joe Sicignano

Castrol’s suggestion to avoid all the horrors of water absorption in brake fluids is to drain and flush the hydraulic system annually, much as one should do with the radiator. It’s more complicated, of course, but can be done with a little planning. Castrol just happens to offer a special high-quality fluid which is more moisture resistant and they call it GT LMA brake fluid, meeting Federal DOT-4 standards. Whether you are flushing or just bleeding air after a repair, here are a few precautions:

  1. Do NOT use old fluid from an open container. It takes in water from the atmosphere.
  2. Store fluid in a tightly-closed container.
  3. No NOT re-use fluid. Sure it’s expensive, but so are bumpers!
  4. Bleed brakes in the order suggested in your workshop manual.
  5. Attach a piece of clear plastic tubing to the bleed screw and catch fluid in a container. Examine fluid for bubbles and contamination asit enters the tube.
  6. Before you bleed or do any work, look for leaks or other signs of deterioration. Repair or replace everything which is suspect.
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Contents copyright 2008, 2009 - Jody F. Kerr

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