From inside the vehicle, pry the pushrod and retainer bushing from the cross shaft lever pin.
Disconnect the interlock switch connector plug.
Remove the 2 retaining nuts and support bracket connecting the clutch reservoir and master cylinder assembly to the firewall.
From the engine compartment, first note the clutch tube routing to the slave cylinder, then remove the attaching hardware for the hydraulic tube retaining clips.
From the engine compartment, remove the clutch reservoir and master cylinder assembly from the firewall. On F-Series and Bronco, when the master cylinder studs are free of the dash panel, rotate cylinder counterclockwise about 100 degrees to clear the interlock switch and remove the cylinder from the vehicle.
How do I change a clutch master cylinder on a 1991 ford f150 5 speed 6 cylinder 4.9L?
I don't have a book on that one, but I would first look at where the clutch pedal linkage goes through the firewall. The master is usually attatched to the engine side. should be just a matter of disconnecting and unbolting then installing the new one. I've done them before but it's been a while since I've worked automotive. Make sure you bleed the system ant the slave.
