How To Check Brake Fluid
The brake fluid reservoir has minimum and maximum marks. A low level can mean worn pads or a leak, so it is worth understanding before topping up.
DifficultyEasy
TimeAbout 5 minutes
AreaOil and fluids
What you need
- Owner’s manualShows the reservoir and the fluid specification (for example DOT 4).
- ClothTo clean the cap before opening.
Step by step
- Park on level groundSwitch off the engine.
- Find the reservoirUsually on the driver’s side near the bulkhead, with a cap marked with the brake fluid symbol.
- Read the levelIt should be between MIN and MAX. The level drops slowly as pads wear, which is normal.
- Do not top up blindlyIf the level is at or below MIN, have the brakes checked: either the pads are very worn or there is a leak.If the brake pedal feels soft or goes down further than usual, do not drive.
- Keep the fluid cleanIf you open the cap, clean it first and close it quickly. Brake fluid absorbs moisture and is damaging to paint.
When to go to a workshop
Have the brakes checked if the level is low, the brake warning light is on, the pedal feels soft, or you see fluid on a wheel or under the car.
Brake fluid should also be changed at the interval in the service schedule, often every two years, because it absorbs water over time.
Questions about How To Check Brake Fluid
Why does brake fluid get low?
As pads wear, the caliper pistons move out and the level drops. A sudden drop means a leak.
Can I use any brake fluid?
No. Use the type specified on the cap or in the manual. DOT 5 silicone fluid is not compatible with most systems.