If the brake fluid in master is dirty, it is best to replace all the fluids in system. Siphon out the fluids in the master cylinder reservoir and clean it before adding new fluids. Bleed all the wheels till new fluids comes out.
If brake fluids are clean, you can just add fresh fluids and proceed with bleeding.
CAUTION:DO NOT allow reservoir to run dry during brake bleeding procedure. Use only clean brake fluid. Ensure no dirt or other foreign matter contaminates brake fluid. DO NOT mix different brands of brake fluid, as they may not be compatible. DO NOT spill brake fluid on vehicle, as it may damage paint. If brake fluid contacts paint, immediately wash with water.
1. If master cylinder is rebuilt or reservoir is empty, bleed master cylinder first. Bleed wheels in sequence. Start on wheel with longest hydraulic line, and work toward wheel with shortest hydraulic line.
2. Raise and support vehicle. Ensure brake fluid reservoir is at least half full during bleeding procedure. Connect one end of transparent vinyl tube to bleeder plug. Submerge other end of tube in a container half filled with clean brake fluid.
3. Have an assistant depress brake pedal several times and hold in depressed position. Loosen bleeder plug, and drain fluid into container. Tighten bleeder plug.
NOTE: Ensure brake pedal remains depressed until bleeder plug is tightened.
4. Refill brake fluid reservoir as necessary. Repeat step 3) until air is no longer discharged. Tighten bleeder plug to 74 INCH lbs. (8 N.M). Ensure fluid leakage is not present. Add fluid to reservoir. Repeat procedure for remaining wheels.
Ignition key need not be on while bleeding.
Saturday, October 30th, 2010 AT 2:39 PM