Motorcycle brake fluid change

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Because brake fluid absorbs moisture over time, it needs to be changed in order to ensure that it retains its properties and to prevent mechanical parts from wearing out.
Draining out brake fluid is a risky operation if not carried out properly – air bubbles can get into the circuit. Be careful – brake fluid is highly corrosive. It is therefore a good idea to protect the various components which may come into contact with it.
The manufacturer's service manual will tell you how often you should check the level, and how frequently it should be replaced. As a general rule, the brake fluid level should be checked every 100 km or every month or so, and it should be changed around every two years.

Before you begin:

  • The manufacturer's service manual will tell you what type of brake fluid you should use and will show you where the container is located.

Steps to follow to make a motorcycle brake fluid change:

  • Make sure the engine has been switched off for 15 to 30 minutes so that the oil has returned to the bottom of the sump.
  • Put your motorcycle on its stand so that it can be stood up and ensure that it is on a surface that is stable and horizontal. Tilt the handlebars so that the brake fluid container is as horizontal as possible
  • Obtain the recommended brake fluid, a container for the used oil and a standard set of tools
  • Unscrew the screws in order to open the brake fluid container cap (also referred to as the master cylinder reservoir)
  • Locate the receiver. The receiver has a drain in the high position in order to evacuate air bubbles
  • Remove the drain’s cap and install a pipe on the drain's screw. Place this pipe in a container in order to retrieve the used liquid
  • Remove some of the used braking liquid from the master cylinder's reservoir, but make sure that you leave a little so that air does not get into the circuit.
  • Use a syringe to inject a little new liquid into the reservoir.
  • Squeeze and then release the brake lever 3 consecutive times, then action the brake lever once again and hold it. Slightly unscrew the drain's screw.
  • Slowly release the brake and watch the fluid leave the pipe.
  • Then tighten the drain screw before releasing the handle.
  • Repeat this action until new fluid appears in the pipe, without any air bubbles.
  • Note: each time you carry out the operation, remember to put new fluid into the reservoir to ensure that air does not get into it.
  • Once the process is complete, tighten the drain screw, put new fluid into the master cylinder reservoir without exceeding the marker, then screw the lid back on.


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