FORD 2010 F-550 v.1 - Manual (Page 382)

7. If the fluid is low, add fluid in small amounts, continuously checking
the level until it is between the MIN and MAX range. Refer to
Maintenance Products Specifications and Capacities in this chapter
for the proper fluid type. Be sure to put the cap back on the reservoir.
BRAKE FLUID
• Vacuum boost system
• Hydroboost system
The fluid level will drop slowly as the brakes wear, and will rise when the
brake components are replaced. Fluid levels between the MIN and MAX
lines are within the normal operating range; there is no need to add
fluid. If the fluid levels are outside of the normal operating range, the
performance of your brake system could be compromised; seek service
from your authorized dealer immediately.
Maintenance and Specifications
382
2010 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)