How often should I check motorcycle brake fluid?
Checking the level and color
Look at the brake fluid reservoir for the level and color. The fluid should sit between the minimum and maximum marks. Fluid that looks dark or murky may be old and should be replaced. Check both front and rear reservoirs if your bike has them.
Level drops can mean worn brake pads or a leak. If the level keeps falling, have the system inspected rather than just topping it off.
- Check the level between min and max marks
- Replace fluid that looks dark or murky
- Watch for steady level drops
- Check both front and rear reservoirs
Replacing the fluid
Use the fluid type listed in the owner's manual, usually DOT 3, DOT 4 or DOT 5.1. Mixing types can cause problems, and DOT 5 is not compatible with most bikes. Bleeding the brakes properly removes air and old fluid.
If you are not comfortable with brake service, a qualified shop can handle the job quickly and safely. Replace the fluid when a brake service calls for it, and record the date and mileage so the next change is easy to schedule. Keep the reservoir cap clean and closed so moisture stays out of the system.
Common mistakes
- Topping off brake fluid without checking for a leak or worn pads.
- Mixing fluid types that are not compatible with the system.
