Pretty simple question. I need to replace the master cylinder on the SA as it has completely failed. I mean leaks it's whole resevior in several hours. I can find FB GSL and GSL SE master cylinders,but nothing for SA 79s.

The car has been swapped to have rear disc brakes, so I assume I can use the master cylnder. Just wanted to ask to be sure. The SA will be back on the road in a couple days after I get the brakes back!

 

oh and is it possible to just use a master cylinder from an FC on the car? I have a good condition spare one if I can. Or has anyone fit a 929 master cylinde into the car?

 

That doesn't quite answer the question. I'm assuming I can just buy any 1t gen master cylinder that had 4 wheel disc brakes. Would I be correct?

 

-ebay has had 79-80/SA-specific br master cyl for $30-ish recently. Likely about $50 at a parts store. Lots around...
-IF you swap to 81+ (aka "FB") verison, you have to swap out brake lines too, because 81+ cars have a finer thread pitch on the fittings. LOT of work beyond just the Cylinder swap. This is only usually done when folks swap in the FB front suspensions...
Stu Aull
80GS
Alaska

 

^^ oh yeah, i forgot about that part. it is a bitch. if you arent modding anything, get the 79-80 to make your life A LOT easier.

 

I pulled the lines off the master cylinder in the car. I then grabbed a spare FC master Cylinder and the line fittings worked, threading right into it. It appears I just need to bend the lines to the positions to use the FC cylinder.

So I am I right to assume the previous owner went to the trouble of changing the brake lines too?

 

I got the brakes working great! I did just a bit of grinding on a rebuilt FC master cylinder and was able to fit in with no problem. I may need to adjust the pedal height, but the SA has amazing pedal feel now. Nice and firm!

 

The PO may not have changed the entire line, just the fitting.