Juice brakes rear wheel cylinder direction

I just looked at an early manual showing lockheed brakes. The exploded view of the wheel cylinder expressly stated that the big piston and cup goes to the rear and the small piston and cup is in the front. Jim (55willys)

 

Why don't you post the picture and/or text from the manual you looked at, relating to the '39-'48 Lockheed brakes Ford used? I know those brakes have the larger wheel cylinder operating the primary (forward) shoe, but I (and maybe others) would like to know why you think otherwise.

 

Holey Moley Batman! V8 Bob is correct. Let's STOP with the misinformation. The first photo is of the left front wheel. The second photo is of the right rear wheel on a 1940 Ford car. Other photos are from service manual with notes I made about 50 years ago when I bought the car. On 1940-48 Ford cars the brake shoe with the longer lining faces forward and so does the larger dia. of the wheel cylinder. This is true for each of the 4 wheels with Lockheed style brakes.

 

One thing to consider is that the hydraulic pressure is the same everywhere in the brake system. So if you have 1000 psi pressure and your small wheel cylinder bore = 1 sq in you will have 1000 lbs of pressure applied to that shoe. If the large wheel cyl = 1.1 sq in it will apply 1,100 lbs of pressure to it's shoe.

So if the small cylinder has the short lining and the lining area is say 20 sq in, the pressure on the small shoe lining will be 50 psi. If the large shoe has 22 sq in of lining area, the large piston applying 1100 psi will apply 50 psi to the lining.

So in this case, with the large piston mated to the larger lining and the small piston mated to the smaller lining, you get the same pressure applied to both linings. Since these brakes aren't self energising, it would make sense that the larger piston should be mated to the larger shoe. With everything adjusted for full contact on the linings, I don't think it would make much difference which shoe was mounted in front, as long as the pistons and linings were paired up correctly. Jim

 

Hey KANE! Did you get it together yet?

 

Ya it's all together. But will be a bit before I do internals and test but.....


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