I have an '85 CJ-7 with 33's and manual brakes. It won't exactly stop on a dime so I went to my local Jeep yard and picked up a used (don't know year)CJ powerbooster and master cylynder. Except for drilling out holes in firewall, (power unit has 4-bolt mounting to bracket, non has 2-bolts direct from master) should I expect to have to change anything? And can I drain all fluid from system and gravity bleed new stuff in?

Perspective is everything!
And rust is stronger than you think!

'85 CJ-7 258 auto nearly stock