master cylinder

does anyone know which mc herm uses in his dual res kit. is it from a cj or something different ? i want to get the brackets and hardware from herm and get the mc locally if possible.

 

come on now, somebody out there has installed this kit, right! i want to buy it locally so if there is a problem with it i can take it back for exchange.

 

A MC from a '70 or '71 CJ should be suitable for drum brakes. I recall that a Corvette MC is popular for 4-wheel disk installations. I don't know what parts Herm uses.

 

I've installed it, but I have no idea which exact master cylinder it is. It has a casting number on it that can be cross referenced. Why not just call Herm and ask him?
P.S. : The mc is different depending on your brakes (disc or drum).

 

The Corvette master cylinder may have the ports on the driver's side rather than the passenger side like Herm's so it might make the plumbing a little more challenging - Not positive on that.

 

Here what i think it is, it is the one that would have originally been put in the 1968 and up to 1971 jeep cj's and possibly the ones used in jeepsters and this is if you are useing drum brakes.
But remember this is what I think, because i am not sure.
There will be someone who will see your post and know for sure, just give it a little time.

 

i am using the original 10 inch drum brakes on my 66 tux. would just feel safer with dual res. also can i put self adjusters on it ?

 

10" brakes should be self-adjusting from the factory.

 

hi,i would use an mc off a 72-78 cj,easier to get and cheaper.

 

if i use herms kit i dont know if it will work with a 72 - 78 mc. if i get self adjusters for a 68 they should work, right?

 

If you et Herm's kit, he should supply the MC, or at least specify which MC to use.

You need self-adjusters for the 10" brakes. The later 11" brake self-adjusters won't work. You may want to look around for used parts... parts for the 10" brakes are scarce and expensive. Now would be a good time to convert to 11" brakes, if you were so inclined.

 

one reason the Corvette MC is popular with hot rodders bec it has ports on both sides.
Is the MC different with disc vs drum or is it the residual pressure port.

 

i didnt realize that self adjuster parts would be hard to get, but you may be right. since i already put new shoes, hardware and rebuilt all wheel cylinders, the cost of putting 11 inch on would be too costly.

 

Omix lists brake hardware including self adjusters for 10" braks, CJ 78-86. I don't know if that will work for you. It shows different part numbers for the brake shoes but it may just be the 78-86 is configured for the self adjusters.

 

No I don't . When I posted this I was repeating something I saw on Two Guys Garage, They were building a custom brake system for a 38 GMC. After I posted this I went to Summit and looked at several Corvette MC's listed and did not see any with ports on bothsides. I wonder if they possibly sourced the MC from someone like Wilwood or Baer for custom applications.

 

according to herm, they have there mc special made for the kit. so you either get the mc from them or try to make another one work. what do you think most people do? so i guess if you have a problem with the mc you have to ship it back and then wait for it to come back. sorry but that sucks. if it ever needs rebuilt i guess you get the parts from herm. this is why i was hoping someone here has already used a different one.

 

Hmm, I don't know about that as far as it being made special for Herm. I just recently had a Herm master cylinder replaced by a local shop (long story) and all they did was match up the casting number and then buy it from their local brake parts wholesaler.

Casting No. 29906-C. Keep in mind this mc is for my Willys Wagon, so it might be different for a CJ. I'll check the Herm mc I have on my Willys MB later on tonight and let you know what the casting number is on that one..

On my Wagon I had a problem with the Herm bracket having to much flex. When I pushed the pedal the the whole face of the bracket was moving (about 1/4" to 1/2"). This, in my opinion was making my pedal a little softer than it could've been and I was worried that over time the bracket might fail. I reinforced it in three places and now it's tight. I'll post some pictures of that later tonight or tomorrow.

 

Well the one on my MB has the same casting number. I have disc brakes on both vehicles.

Here's the pictures of the bracing I spoke of.

The pipe was added from the outside of the mounting plate to the frame.


The vertical piece of steel just to the right of the plunger hole was added as well.


Another 1/8" plate was sandwiched next to the original one.

It's MUCH more solid now, the bracket does not move at all.

Looks like I fouled something up with posting those pictures. Here's a link to them:http://s664.photobucket.com/albums/vv5/mpcwillys/Willys%20Wagon/