Ok, so I am trying to remove the Booster/MC from the firewall to make way for
painting behind it. I got under the dash and spent the hour in a horribly
conformed way to get the 4 nuts off the back of the booster, and the cotter
pin/rod that holds it to the brake pedal. Get to the front and begin taking the
lines off the PPV and the lower part of the brake booster. Problem, my 10mm
wrench (the perfect size) will NOT budge the nuts at all! I have tried PB Blaster,
Liquid wrench, acetone+ATF, everything. I have been going at it for almost a
week; Spraying it, let it sit a day, try to wrench it (begins to round the head),
spray it with something else and MORE of it, let it sit, etc.

Driving me crazy, I do not want to buy another MC because I round the nuts
holding the hard lines in. I am about to get my cut off disc and just slice the hard
lines since I might as well run new ones the way I like.

I will be removing the brake booster itself and converting to manual brakes like
Bobbo has. He has been a big help thus far, it's just these stupid brake nuts!

Also, what would the difference be if I ran a FC brake MC? They bolt to the
BB with 2 bolts left and right, and the FB has the bolts top and bottom, limiting
the placement of the MC on the firewall.

EDIT: I am a few steps away from using the torch, but I worry about the brake
fluid boiling or melting the reservoir.

 

Is it a line wrench or regular style wrench?

-billy

 

Hold on, I will get a picture of it. It has a notch in it if that helps? Haha.

Yeah, it is just a regular wrench, 10mm. Has a notch on one side, which
I assume is to rotate the wrench without lifting it. I'll be needing a line
wrench then? Just googled it, it seems to be a much better option. I got
the front top nut on the MC off, then realized it just went to the PPV,
which did nothing to help, so I put it back on. Guess I got lucky?

Double edit: RX8 is the new test car? What happened to the 3?

 

He traded the 3 to get the 8.

Yep, run down to Autozone, etc. and get yourself a line wrench. It will make those fittings much easier to get off and keep from rounding off the nut.

 

Stu heat is your best option. Just put the blue torch flame on it for a bit and use
the "line" wrenches. Regular wrench will be a big fail. A last resort is to use the
heat and then grap it with a vise grips really tight and then tap it with a hammer.
Never fails for me even on the most rusted crap and I'm from up north.

 

BTW, the plastic reservoir can be removed from the MC if you're afraid of melting it. Just rock it gently while lifting it; it's only held in by sealing rubbers and a 'bump' in each downtube.

 

Line wrench could help. You need to own one anyways
Sometimes they are even to tight for a line wrench to work.

Where you been??? The Rx3 went bye bye. The 8 is gr8. I have had to many Rx3s needed a change

-billy

 

The bolts on the FC master brake cylinder are clocked different than the FB. You will need to swap the master and booster. Since the FC booster is a larger diameter, the holes for both the brake and clutch on the firewall will need to be ovaled away from each other. Approximately 3/8" total.

If the line wrench doesn't work, get a pair of 5R vice grips.

 

Not going to be running a Booster, switching from a FB to FC just nets me more play
room on where to mount it on the firewall based on where on the pedal I want it to
mount to... If that makes sense.

 

Haha, I am a little slow, sorry. Too much fiberglass, got into my brain

How are you liking the 8? Is it as superb a handler as they say?