Brake Fluid
NOTE:
Most manufacturers prohibit the use of DOT 5 brake fluid in a system equipped with ABS. DOT 3, DOT 4, and DOT 5.1 brake fluids are clear or light amber in color. DOT 5 brake fluid is violet in color. Correct fluid type is normally stamped on the master cylinder cover.
NOTE:
Fluid Flush - a process using a sufficient volume of fluid to help remove contaminants and replacing the contaminated fluid with new fluid of the same type and specification. At times a chemical may be used to enhance removal.
NOTE:
Fluid Exchange/Replace - draining (evacuating) old fluid and replacing it with new fluid of the correct type and specification.
| Condition | Code | Procedure |
|---|---|---|
| At or beyond OEM service interval | 3 | Suggest fluid exchange/replacement |
| Brake fluid type incorrect | B | Require flushing and refilling |
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NOTE:
For example, DOT fluid lower than specified for the vehicle or silicone brake fluid (DOT 5) in an ABS system
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| Contaminated, for example, fluid other than brake fluid present | A | Require service |
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NOTE:
If a fluid other than brake fluid is present in the brake system which DOES affect the rubber parts, the required service is to: 1) remove all components having rubber parts from the system, 2) flush lines, 3) repair or replace all components having rubber parts, and 4) fill with correct brake fluid.
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| Contaminated, for example, fluid other than brake fluid present | B | Require service |
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NOTE:
If a fluid other than brake fluid is present in the brake system which DOES NOT affect the rubber parts, the required service is to flush and fill with the correct brake fluid.
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| Corrosion inhibitors depleted | B | Require fluid exchange/replacement |
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NOTE:
A copper content of 200 ppm or greater indicates a depletion of corrosion inhibitors in the brake fluid.
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| Fluid discolored | No Service Suggested or Required | |
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NOTE:
Further testing necessary to determine condition of fluid.
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| Hydraulic component overhaul or replacement | 3 | Suggest flushing and refilling |
| Rubber master cylinder cover gasket distorted and gummy | A | Require replacement of gasket |
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NOTE:
This condition may indicate contaminated brake fluid. Further inspection required.
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