going to be putting fb rear and front on the sa and thought i would just change out the entire brake system.

 

yes

 

strait bolt on to the sa booster?

 

Not sure off hand... it was there along with a -SE suspension/brake upgrade when I got the SA so I'm not sure if it's the same.

I do know that the -SE MC mounts to a non -SE brake booster... I did an upgrade to my FB, and I believe the non -SE MC mounts to the SA brake booster. However looking a the advance auto web site, they list two different part numbers for the booster. I still do believe they will work though.

 

I've done several SA conversion. Everthing from the FB is transferrable to SA. But keep the SA brake booster as it is smaller than the FB. If you switch to FB booster, then you will need to mock up the clutch master. Complaints on this swap? None.

 

thanks wacky, that was just what i wanted to hear.

 

Bringing this thread back instead of starting a new one.

Questions for midwest and wacky. With just the usage of the Fb master cylinder without changing the rear to disc brakes was there a dramatic improvement in the feel of the Sa brake system?

 

I dont recall since I no longer own a SA and it has been awhile since I last drove Dave's SA. However, Im currently working in my newly acquired RX-3. I upgraded the RX-3's front suspension/front brakes to FB with illumina/GC Coil over/RESpeed Camber kit/1" aluminum top spacer (the spacer gave me two fingers gap between the front tire and the fender lip). At the same time, Im converting the rear drums to FB disc brakes from RESpeed.

At any rate, I also decided to upgrade the RX-3's MC to FB at first; however, after a long and thorough research, I found out that the 79 RWD GLC has a larger bore (13/16 VS RX-3 and FB's 7/8 or something). So I bought another MC. I will let you know how it goes as I still waiting for new rear brake rotors, brake bias and the exhaust is not install yet.

Why am I talking too much? If the result is better than the smaller M/C (RX-3, FB, SA), I will be upgrading my 2 FB's to GLC also.

 

i still havent gotten around to doing this, but when i do it will be with rear disc/lsd.

 

I changed everything fromt he FB to my SA minus the brake booster, for the the clutch i used everything between the fb and fc's with no problems. On the brake conversion you do have to change the brake master cylinder. all the brake lines.
SA has different threads from the FB

 

So I take it that you put in a rear disc system from your Fb?

 

DOUBLE POST SORRY

 

Yeah threw in the whole GSL-SE cino letra in for the front and the rear. easy swap took a couple of hours if that

 

Well, that still does not answer my question,lol. I need input from someone that just installed the FB master cylinder to see if it made any difference.

 

the brake pressure is the same there is nothing different between them both. As long as the rubber seal on the inside of the booster is not cracked or leaking any air the pressure between the both is the same. The swap was not done on my car because my SA brake booster that have in my car is just fine.

 

Here's a summary:
The FB upgrade brake upgrade is to have a much better caliper than the wedge type, and to have more front strut selection since the SA are almost absolete.

Is FB M/C better than SA?
I believe the answer is NO. The bore is the same so it shouldnt change.

If anyone feels that I am wrong, spit it out and dont swallow it.

 

Thank you, that is the answer I am after.

 

Now go get a 79 GLC M/C and try it. You may like it.

 

No one here has mentioned a very important difference, which caused me problems years ago. The RX-2, presumably the RX-3 and -4, the early RWD GLC(78-80) and the FA all have course threads on the brake line fittings, where they screw into the master cyl, calipers, distribution blocks, etc. I believe these are 10x1.25.

Starting with the FB, they are finer thread on the whole system, 10x1.0 as I recall.

When I built my rotary GLC long ago, I used 83 RX-7 struts, and had to convert them to the 79 style calipers. Of course I could have searched around for the proper fittings, fabricated new front brake lines, but I was trying to get it done with parts I had. I ended up using the cheapest, softest front pads I could find, and they worked well. And I only had to replace them once in over 100,000 miles.


Regarding this: "
At any rate, I also decided to upgrade the RX-3's MC to FB at first; however, after a long and thorough research, I found out that the 79 RWD GLC has a larger bore (13/16 VS RX-3 and FB's 7/8 or something). So I bought another MC. I will let you know how it goes as I still waiting for new rear brake rotors, brake bias and the exhaust is not install yet.

Why am I talking too much? If the result is better than the smaller M/C (RX-3, FB, SA), I will be upgrading my 2 FB's to GLC also."


I don't understand why you would want to go with a larger bore master cylinder. That will reduce pedal travel, but will increase pedal pressure. I would be wanting to go the other way. I recently installed a 79 RX-7 master cyl on an RX-2 and it provided good brake feel. But we had to do a good job of bleeding to get reasonable pedal travel.

There is some discussion on this here:
https://www.rx7club.com/showthread.p...aster+cylinder

 

I have tried the FB ones and I didnt noticed any improvements over the RX-3. And no, I didnt read that thread and IF I DID, it wont make any difference. Im going all out to find the right match since I got nothing better to do. And of course, it has to be bled properly....Im doing a complete swap and I dont do a half-*** job.

Well, I read that post...using a BFH to fit a FB M/C on a RX-2.

 

the FB and SA masters aren't very different, but the boosters ARE. that is the big difference, because the SA booster is at least an inch smaller so the added power asist is less which means you get better "feel" with the SA booster.

 

Without relocation of the clutch master cylinder you can't install the Fb booster. If I knew for sure that the swapping of the front spindles with brakes would make that shitty pedal feel go away I might do that. But I think the benefit of that larger booster would be very beneficial to the overall braking.

 

ok, so the glc..err..626 master will bolt right up..to which yea 1st gens? hearing the thread pitch difference is scary

 

Its not a hard to flare. Practice makes perfect.