Brake Fluid
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 fluid is violet in color. Correct fluid type is stamped on the master cylinder cover. Monroe® recommends using dip strips to detect copper sulfides.
| Condition |
Code |
Procedure |
| Beyond service interval |
3 |
Suggest flushing and refilling with correct fluid |
| Brake fluid type incorrect |
B |
Require flushing and refilling with correct fluid |
| For example, DOT fluid lower than specified for the vehicle or silicone brake fluid (DOT 5 or 5.1) in an ABS System. |
|
|
| Contaminated, for example, fluid other than brake fluid present |
B |
Require service |
| 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. |
|
|
| Contaminated, for example, fluid other than brake fluid present |
A |
Require service |
| If a fluid other than brake fluid is present in the brake system which DOES affect the rubber parts, the required service is to: l) remove all components having rubber parts from the system, 2) flush lines with denatured alcohol or brake cleaner, 3) The required service is to flush and fill with the correct brake fluid. |
|
|
| Hydraulic component overhaul or replacement |
3 |
Suggest flushing and refilling with correct fluid |
| Rubber master cylinder cover gasket distorted and gummy |
A |
Require replacement of gasket |
| This condition may indicate contaminated brake fluid. |
|
|
 |
| Legend |
| A |
Part no longer performs intended purpose |
| B |
Part does not meet a design specification (regardless of performance) |
| C |
Part is missing |
| 1 |
Part is close to the end of its useful life (just above discard specifications, or weak; failure likely to occur soon, etc.) |
| 2 |
To address a customer need, convenience, or request (to stiffen ride, enhance performance, eliminate noise, etc.) |
| 3 |
To comply with maintenance recommended by the vehicle’s Original Equipment Manufacturer (OEM) |
| 4 |
Technician’s recommendation based on substantial and informed experience |
|
