Does a 1986 ford f150 have a slave cylinder?
if its a standard/manual truck.
slave cylinder would be located on the firewall next to the brake booster, and would take standard dot 3 brake fluid.
The slave cylinder is INSIDE the transmission bellhousing , it slides over the transmission input shaft , and then is bolted to the transmission. To change the slave cylinder the transmission has to be removed , but the slave cylinder line can be blead from the bleeder outside of the transmission bellhousing