(G) External Leakage Check

SYMPTOM: Any dampness or dripping of brake fluid on the Powermaster III, brake lines, proportioning valve or calipers.

POSSIBLE CAUSES: Leaking O-ring seal(s), poor connections, over-filled front chamber of reservoir, over-filled rear chamber of reservoir.

INSPECT

Fluid Level Fill Marks:

1. Depressurize the Powermaster III Unit, refer to "Depressurizing the Powermaster III Unit" in Service and Repair.
2. Clean and remove the reservoir cover and diaphragm assembly. Check the fluid levels.
3. If the front reservoir chamber level is high, drain fluid to restore to proper level.
4. If the rear chamber fluid level is high, drain fluid to restore to proper level. A high rear chamber fluid level may be caused by filling the reservoir without depressurizing the system.
5. Clean and dry the Powermaster III and other brake system parts so that the source of a leak may be more easily detected.
6. Install the reservoir cover and diaphragm assembly.
7. Turn on the ignition and pump the brakes. Check for leaks. Tighten any loose connections. Repair calipers or brake lines as necessary. If leakage occurs on the Powermaster III, tighten connections if possible, or replace the Powermaster III. Depressurize the Powermaster III, refer to "Depressurizing the Powermaster III Unit" and check the fluid levels in the reservoir chamber.
8. If the fluid level in the front reservoir chamber is high, refer to test (H) "Fluid Leaking into Front Chamber". If the level in the rear reservoir chamber is high, replace the Powermaster III Unit. (H) Fluid Leaking Into Front Chamber