Master Cylinder Identification Help

[Cj785]

Hello,
I'm trying to figure out what vehicle this master cylinder came out of so I can replace it. I've been to the auto shop a couple of times trying to match it up without any luck.

Any ideas out there?

 

[CJ]

Is this for your 85? That looks like a foreign MC.

I would want to put on a factory type MC, I would put back stock.

 

[Cj785]

Do you mean foreign vehicle (overseas) or just a master cylinder from another vehicle, not my Jeep? I do believe it's a MC from another vehicle.

The CJ has a Chevy 350 in it. Brakes off of a Scout II (along with the axles) so I'm guessing the booster for the MC is different from the original too and I don't want to replace the booster if I don't have too...that's the reason I'm trying to match it up.

I'm a newbie wrencher so if I'm missing an obvious reason to just throw the original MC on let me know.

Thanks for the reply.

 

[mtnwhlr]

I think it looks like Chevy. Came from same vech as the motor?

 

[BusaDave9]

Maybe it's off the scout that was donor for the axles. But that's just a guess.

There are far too many specs on a master cylinder for us to guess what you need. When I got my CJ the brake pedal was way too high. Turns out the PO installed the wrong master cylinder. It looked right but after installing the correct one the pedal was back to normal.

 

[CJ]

Do you mean foreign vehicle (overseas) or just a master cylinder from another vehicle, not my Jeep? I do believe it's a MC from another vehicle. ~~~

It is the wrong MC on your CJ. If it was my vehicle - I would put on an OEM MC.

 

[BusaDave9]

If you get a CJ master cylinder I am willing to be it won't fit on the booster.
I bet a PO converted to power brakes and used parts from who-knows-what to make it work.

 

[Cj785]

I bet a PO converted to power brakes and used parts from who-knows-what to make it work.

I think you are right. Maybe a GMC Blazer I think. I've seen a couple of pics on the net that match up really close.

Anyone have any tips on measuring this thing so I can just search for specs instead of images?

 

[mtnwhlr]

You could run over the juckyard and look around. But then I'm an old guy.

 

[Cj785]

The Junkyard is not a bad idea now that I have it narrowed down, I think** to a GMC Blazer.

 

[BusaDave9]

It's hard tracking down those specs.
Do you know the year of the Scout or GMC Blazer?
Try going to RockAuto Auto Parts It's a great site for OEM parts. Narrow it down to the year and model. Then when you view the master cylinder the site has a picture of the actual part. Once you think you have the correct part don't buy it on line (you most likely will have to return it) instead remove your master cylinder and bring it down to your auto parts store to compare. Look at the bolt pattern. I't also important to get a master cylinder with the correct bore (the hole where the plunger fits into the master cylinder)

 

[mtnwhlr]

Do you know what the motor came out of?

 

[Cj785]

Thanks Busa! I hope you didn't remove yours for the pic, lol. I headed to Autozone with my master cylinder in my grippy little hands and did the best I could to match it up with the replacement parts they had in their computer. The part that matched the best is on it's way in today at 3pm my time. Here's to hoping it fits!

 

[Cj785]

No idea what the motor came out of, mtnwhlr. After I truck over to the auto parts store, I'm going to hunt for the codes on the motor and look it up.

 

[Old Dog]

is there a part # on it that you could google?