The brake fluid reservoir is part of the normal brake system and is filled or checked in the usual manner. Always clean the reservoir cap and surrounding area thoroughly before removing the cap. Fill the reservoir only to the FULL mark; do not overfill. Use only fresh DOT 3 brake fluid from unopened containers. Do not use any fluid containing a petroleum base. Do not use any fluid which has been exposed to water or moisture. Failure to use the correct fluid will affect system function and component life.