Wheel Cylinder Bolts + flair nut question!!! - JeepForum.com
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Unread 10-23-2013, 11:59 AM   #1
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1994 YJ Wrangler 
Join Date: Oct 2013
Location: Charlevoix, Michigan
Posts: 46
Wheel Cylinder Bolts + flair nut question!!!

I run a 94 yj 2.5l 4cyl 5 speed manual. I am tackling the rear drum brakes and wheel cylinder (I just replaced the front). I am also replacing the parking brake assembly and all new ebrake cables. I am now stuck on the wheel cylinder bolts and flair nut. Im having a hard time as they seem to be rounding. I'm spraying them with pb blaster periodically. The bolts seem to use either a 3/8 socket or 10mm metric? and the flair nut is somewhere around 8mm metric? I don't want to force more pressure on these until I can figure out whether I need to use SAE or METRIC on them. I'm going out today to get a flair wrench set but need to know whether to get SAE or METRIC. I also have access to a MAAP torch so wondering if it is safe to heat those bolts up near the brake line? so....
1.) SAE or METRIC? if you know exact sizes, then yay!
2.) Safe to use MAAP/Propane torch on the wheel cylinder bolts?

Thanks Fellow Jeepers!!!

Also: I don't think these brakes have been touched in 20 years. lol. Bolts are ON there good.

Last edited by Crunko; 10-23-2013 at 12:09 PM..
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Unread 10-23-2013, 12:57 PM   #2
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1987 YJ Wrangler 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 7,055
if they end up not coming out, just get some generic straight brake tubing from the auto parts store and bend it to fit your needs. they sell that new green metal type lines that doesn;t corrode and its super cheap.

i cannot remember the size but i think it was an 8mm from when i did mine.

if you boil the fluid, i think you will have to flush the whole system
I don't feel like working on anything, at this time.
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Unread 10-23-2013, 07:11 PM   #3
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1989 YJ Wrangler 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,672
being your in a state that uses salt on their roads.... cut the brake line and use a socket to get the line off... then do the same thing at the other end. The nut is most likely rusted to the line and wont turn anyway without breaking. as for the bolts... if they wont come out... grind them off and get a new cyl.
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
()_) ()_)==O=)_)
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