Projects Juice Brakes on Model A

Working on putting hydraulic brakes on the front of my 29 A. I rebuilt everything and have the back plates drilled for the model a axle. But when I put everything together the axle castle nut doesn't go on far enough to put the cotter key in.

When I do tighten it to let the key go into place the drum is way to tight and won't roll. Do you need a different nut from the stock model A one?

 

It might help if you state what backing plates you are using....not many mind readers here

 

Sorry, 1940 backing plates and 1940 drums

 

What you are saying doesn't make sense. How about some pictures? Are you using the standard kit (as shown here: https://www.clingsaftermarket.com/addtocart.asp?prod=39) to install the backing plates and hub/drum ***embly? One thing I don't understand is that you said you had the backing plates drilled for the Model A axle, you did mean to say spindle didn't you?

Charlie Stephens

 

Yeah I installed the kit, backing plates are drilled for the spindles. My bad

 

Are the bearing races fully seated in the hub?

Charlie Stephens

 

What key are you refering to?

 

I reread your question . You say front then talk about rear? You might want to rephrase. Best of luck

http://www.jalopyjournal.com/forum/...ting-39-48-hydraulic-brakes-to-your-a.124112/

 

Far as I know only 2 things can cause that if your parts are correct. Not having both Hub races fully seated against the inner shoulder. Incorrect inner bearing. If both races are seated take the inner Bearing out and slide it on the spindle shaft. Check to be sure the face of the inner bearing race is flat against the spindle. Some bearings will fit but have a more square corner and don't fit the radeius of the spindle holding the bearing outboard and stopping the Cotter key from going in the hole.
The Wizzard

 

On the 40 Ford backing plates I put on my Model A rear axle, I shaved off about 1/4 inch off the lip. This was discussed as being necessary in some old posts and I found it necessary as well so that the drums didn't bottom out on the backing plate when tightened.

 

I have heard of the problem you describe on the rear many times and I have read about it many more times but I have never once heard about it being a problem on the front.

Charlie Stephens

 

It is probably time to start posting pictures, a lot of pictures. There may be something going on with incorrect parts that people would spot.

Charlie Stephens

 

Couple more:
Did you remove the original Model A grease seal from the spindle? If not, it will bind on the new grease seal and cause a similar problem.

Are you using post '35 spindle nuts, the later ones are a little thinner, there are also thick and thin versions of the tanged washers.