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Under the hood on the driver side.
( 3 ) according to the owners manual
In the brake master cylinder reservoir on the drivers side of the engine compartment near the firewall
In a 2001 Ford F-250 : ( DOT 3 brake fluid meeting Ford specification ESA-M6C25-A is used in the brake system )
Sounds like a master cylinder.
brake pressure loss and pedal going straight to floor is mostly caused by loss of brake fluid or air in brake system look under car and on inside of wheels to see if fluid is leaking. check brake fluid level at master cylander if no fluid seems to be leaking, have the brake system bled for air. this is the simplest remedy to start with if that doesnt fix it have the brake power booster checked to make sure fluis is not leaking into that also check on firewall in engine bay round booster for fluid and on inside of cab on firewall for fluid
Not knowing what year the truck is, my guess would be coolant. Check or monitor the level of all the fluids including brake fluid.
replace brake light switch located on brake pedal under dash
Motorcraft fluids
You fill the transmission fluid on the 1988 F250 diesel at the dipstick of the transmission. You will need a filler funnel in order to keep spillage to a minimum.
Should be "peel off" rotors if not you will need a spanner socket only
There should be a dipstick at the very back of the engine. It should be gray and say transmission.