Best master cylinder for manual 4 wheel disc conversion

[grizgtx]

I am converting my 67 GTX from 4 wheel drum to wilwood 4 wheel disc. I have been told that I need a new master cylinder. Could get a wilwood but would like to get something more original that will work. I am currently running a manual master cylinder and want to stay that way. Looking for a direct bolt on that will work well for my application.

 

[Meep-Meep]

You want to start your search with bore size. What does Wilwood recommend for the perfect balance of pedal feel and stopping power? There are no direct bolt on 4 wheel disc masters for early MoPars. The best you will do is get a late model one and use an adapter. The early Corvette ones are a 1" bore and they work with an adapter, but don't look stock MoPar. You can remove the residual pressure valve from a drum brake one but then the small reservoir on the one side might bite you in the ***. The larger reservoir is to compensate for increasing volume in the calipers due to pad wear.

 

[badmopar67]

Another route would be Autozone they offer one for your gtx/440ci ( m1487) with front disc and a 1" bore with a bigger reservoir then your manual brake one, or you can go to a 67 fury/440ci (m1327) one with a even bigger reservoir and 1" bore not sure on the stud size that goes throw the firewall you would have to check that out

 

[grizgtx]

Thanks guys for the responses. This helps a lot.

 

[wedge69]

I am running the Mopar perfformance one with the even size rez. You will need the 4 to 2 bolt adapter also. I have a new adapter if you need one ? I am running 4 wheel welwood disc's on my car.

 

[2059]

master power. 1-1/8" bore. I'll get you the PN tomorrow.

 

[Jim Bob The Dancing Bear]

I have the Wilwood 13" rotors with 6 piston calipers front and 12" rotors with 4 piston calipers rear. I went with a Wilwood master in the 7/8 bore. I called Wilwood tech support to insure I got the correct master for my setup.

http://www.summitracing.com/parts/wil-261-13271-bk/overview/

For manual brakes you want a small bore and more stoke. If not you will have a rock hard kettle with not enough force to stop the car worth a damn.

 

[badmopar67]

Yes if you plan on staying with manual disc brakes your going to want the 1 inch bore size or smaller for your master cylinder which creates higher pressure with less effort then a 1 1/8 bore size. 1 1/8 bore size will give you less pedal travel but you will have to exert more pressure to get the same stopping power

 

[grizgtx]

So after some research I have found a few "stock" looking ones. Mancini Racing has one, a Bendix 1404 style MC for 145.00. Wilwood said I need 260-9439 7/8 bore and theirs comes with the rod. I also found a raybestos one on summit MC36283 for 62.00 but will it work, I think so but now starting to like the wilwood so I have a matched system.

Jim Bob, the one you reference, I assume the MC needs an adapter like what wedge69 has?

And wilwood said I will have to use 13/16 brake lines? Anyone else heard of that? Not sure what size came on drum cars.

Thanks

- - - Updated - - -

Oops 3/16 lines...

 

[wedge69]

The Wilwood is two bolt and you will still need the adapter as far as i know ? Unless thay offer a 4 bolt ??

 

[Jim Bob The Dancing Bear]

I had to buy a 45 dollar adapter. I was (am) unsatisfied with the quality of the part so I may be making another one. I want to press in the bolt studs from my original master cylinder and celan up the outside edges. The piece I purchased was plazma cut and painted or powder coated. It looks decent except the edges are not finished. Plus using nuts and bolts will be a pain in the butt during install.

 

[wedge69]

Theres alot of them out there thats why I got this Billet one with pressed in studs. Its a nice part and is what I would have made if I wanted to but there not that costly. The one i have is new and just used for moc up. But heck I only want $35. for it .View attachment 178732

 

[hemidart67]

I just made a bunch of these on my CNC mill last week.
I shipped out one to a fellow member on Forabodiesonly so he can test fit it on his car and make sure it will work and then i will post them for sale
He requested his to be bare aluminum but i can get them anodized black just like the dr diff ones and the Mancini ones.I will try and get a pic up on here and also start a thread when i know everything is good to go.
Cost will be $28.95 Canadian plus shipping so i will adjust the price lower for my American friends to make it fair.

 

[nm9stheham]

BTW, do you have the width and height center-to-center distances on the 4 mounting holes? I just want to do a swap of the old single MC to a dual.

 

[anmracing]

View attachment 178827Theres alot of them out there thats why I got this Billet one with pressed in studs. Its a nice part and is what I would have made if I wanted to but there not that costly. The one i have is new and just used for moc up. But heck I only want $35. for it .View attachment 178732

I was curious as to whether or not you still sell these? I could use one.
~A