The brake reservoir is clear so it makes it easy to see of the fluid level in is correct. Use any DOT 4 fluid if it needs topping off, but make sure there are no leaks first and also check to see if the pads need replacing.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record