Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Brake Fluid: Testing and Inspection

Indications of fluid contamination:
Swollen or deteriorated rubber parts.
- Swollen rubber parts indicate the presence of petroleum in the brake fluid.

To test for contamination:
Put small amount of drained brake fluid in clear glass jar.
- If fluid separates into layers, there is mineral oil contamination.

If contaminated:
Drain and thoroughly flush system, and replace all rubber parts.