I am in need of a new clutch master cylinder for my 83' FB and I need to know if a 79-80 would fit. Thanks in advance.

 

I'd say yes. I'm guessing you ask because you already have one or have a souce to get one quick. I'd suggest if that's not true to find one from an fb.

 

just get a rebuild kit, i did mine a month ago and its working fine

 

They look really close I would go with the rebuild kit first. I found some cheap on-line when I rebuilt mine. However I rebuilt the master and the slave, the slave still leaked so I purchased a whole new slave cylinder. But I only lost 6 bucks to find out. But if you want to try the 79-80 master it won't hurt.

 

I went with the rebuild kit and it did not last very long. I believe it lasted for just a weak and ibegan to loose pressure. The composition of the rebuild materials were very weak and not up to OEM durability. The new master I'm looking at is on eBay and is for 79-80.

 

Rebuilt master and slaves are about as reliable as rebuilt starters and alternators for our cars.Unless you have a flawless bore,and a good quality seal kit,it wont last.

 

Would the 79-80 master work with my 83?

 

Yes and no.

Yes it will bolt in. The master cylinders are identical.

No you won't be able to hook up the line. The thread pitch is different. You could try to find an adapter.

 

My master cylinder is also gone, no pressure so i',m going to have to pick one up this weekend since i'm getting my check on friday .

 

Would an 84-85 slave fit? There is one on eBay for the 84-85 I might buy if it fits.

 

I'd say just go to your local auto parts store. They really arent all that expensive (i think i got my new one for $30) and you wont have to worry about it anymore. Plus, you wont have to wait for the $*^&%$* ebay person to send it...

 

I bought my rebuild kit from autozone and i have not lost pressure. I believe what i did before i installed it helped, because i soaked the parts in hydrolic fluid overnight before installing so there were no dry spots when it was inserted.

 

Like I said, I am leaning towards getting a new one than rebuilding. I used the rebuild kit already and it failed on me.

What autoparts store did you get your's from for $30? The ones I've checked offered them for $60.

 

Maybe it was $40. Anyways, it was from Schucks, but i got a discount because my brother works there.

 

Thread pitch changed in 81. 79-80 or 81-85

 

This means an 84-85 slave would work with my 83?

 

Victoria British sells them pretty cheap too. Although you need a catalogue to order through them. Either through the mail or online(with part numbers). If ya want I can get price and part number for ya.

 

Bah I gots mine handy so i will do some work, its even featured on the cover:

800-255-0088

master cylinder:
49.95 for all years

slave cylinder:
24.95 for all years.

For an 83 the numbers would be:

master: 63-111
slave: 63-212

 

Okay.

Primer on the clutch hydraulics setup.

Dimensionally, all master cylinders are identical. The only difference is that Series 1 (SA) had a different thread pitch than Series 2 and 3 (FB). The internals are the same.

The clutch hoses are the same, except for the thread pitch difference.

There were three different slave cylinders. All three are identical internally. '79-80 and '81-82 12A/GSL-SEwere the same casting with just the thread pitch difference. '83-85 12A had a different casting, to reposition the bleeder screw for easier (heh) access with the beehive oil cooler in the way.

Note that everything is interchangeable as long as you bear in mind the hydraulic thread pitch differences (easier to get the correct parts than adapt) and the bleeder screw location if you have a beehive.





Note that *all* hydraulic threads changed pitch for '81.