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Brake Fluid Checklist

Maintain peak stopping power with our comprehensive brake fluid checklist. Learn to inspect levels, identify contamination, and spot leaks to ensure your vehicle's safety.

Car Maintenance Checklists·carschecklist.com/checklist/brake-fluid-checklist
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ItemPriorityWhoTimeWhat to check (Pass/Fail)If failed (Next step)
Reservoir LevelRequiredDIY2 minBetween MIN and MAX linesTop up and check pad wear
Fluid ColorRequiredDIY1 minClear to light amberFlush/replace fluid
Fluid ClarityRecommendedDIY1 minTransparent; no floating debrisFlush system immediately
Master Cylinder Cap SealRequiredDIY2 minRubber seal is intact/not swollenReplace cap/seal
Master Cylinder ExteriorRequiredDIY3 minDry; no wetness or peeling paintInspect for internal leak
Brake Line ConnectionsRequiredShop/DIY10 minDry; no signs of seepageTighten or replace line
Brake Pedal FeelRequiredDIY1 minFirm; does not sink to floorBleed system; check master cylinder
ABS Module ExteriorRecommendedDIY5 minNo visible fluid at portsSeek professional repair
Flex Hose ConditionRequiredShop/DIY10 minNo cracks, bulges, or wet spotsReplace hose immediately
Caliper/Cylinder SeepageRequiredShop/DIY15 minDry around pistons and bleedersRebuild or replace caliper
Moisture Content %RecommendedDIY3 minLess than 2% water contentFlush and replace fluid
Copper Content LevelOptionalShop5 minWithin acceptable PPM rangeFlush system
Reservoir Vent HoleRecommendedDIY2 minClear of dirt and debrisClean with needle/air
Warning Light StatusRequiredDIY1 min'Brake' light is OFFScan for codes; check level
Booster Vacuum HoseRecommendedDIY3 minNo cracks or fluid inside hoseReplace hose/check master seal
Fluid Age/Service RecordRequiredDIY2 minWithin recommended time intervalSchedule fluid exchange
Proportioning ValveOptionalShop5 minNo leaks at the valve bodyReplace valve
Bleeder Valve CapsRecommendedDIY10 minAll 4 caps present and secureReplace missing dust caps

Use this table as a guide during your monthly maintenance routine. Start with the visual checks under the hood before moving to the wheels if you suspect a leak or have a soft pedal.

Always record the date and the condition of the fluid in your maintenance log. If you find yourself topping off the fluid frequently, you likely have a leak that requires immediate professional attention.