As mentioned frequently on here, Ford often uses different size fittings
on brake lines to prevent assembly errors.
In some cases the threaded body is different size; in others, just the
There are thread adapters made for the former case, available at local
parts stores like KOI and NAPA. Some reason, not Autozone!
But dont worry about nuthead size if the threads fit.
I recently had a problem replacing a line into a rear ABS block where the
replacement fitting seemed 'loose' in the block socket. I didnt want to
reflare to use the original big-head fitting so I prayed. And it sealed
okay. (And yes, I checked that both it and the original fit a female
HOWEVER - if you are splicing/flaring a line anyway as I will shortly to
replace rusted front-to rear lines, suggest you reuse the original nut.
DONT FORGET TO COUNT FITTINGS BEFORE YOU FLARE!!! Common 'ooops!'
Replacing a line, nut rusted solid? DONT fudge around, cut the line at
the nut and use a six-point socket. Flex line nut rusted solid? same
thing... not worth the hassle and odds are flex line will start leaking
Also, Break loose bleeders with six point socket before using box wrench
during bleed. Saves your nerves.