Another 11" Drum Question...

I did a lot of searching, but didn't find exactly what I was looking for. Apologies if this has been covered before.

I plan to install 11" drums from a 1976 D30 on the front axle of my 1969 CJ5. The rear brakes will be unchanged. I have the original dual MC.

What size wheel cylinders will be necessary on the front to achieve the correct ratio of front and rear braking? Will the stock cylinders from 1976 be correct?

 

If you want to benefit completely from the 11" brakes in the front then use the stock front wheel cylinders. If you find the rears are not up to the task then upgrade the rear. Most likely it will be fine. If you down size the front wheel cylinders you are starting to negate the benefits of the larger front brakes.

 

Interesting Nick, I installed new cylinders from the donor Wagoneer with a larger bore when I upgrade my drums.

 

You need for the braking power at the rear to be less than on the front, however you accomplish it. Because of weight transfer, the front wheels do most of the stopping. Ideally you need for the fronts and rears to lock up at the same time, or failing that, the fronts to lock up first. Locked up rear wheels lose traction and will put you into a spin when braking in a curve.

 

We did this exact swap on my dad's 69 CJ5 many years ago. No problem with it at all.

 

When I did this, I just ordered the same parts as the jeep it came from.

Worked fine having 11 up front and 10 in back too.

Mine came from a 74 cj5 so thats the vehicle I used to search for wheel cylinder. Worked fine for me.

 

Did you get your answer from all the above posts? The original 76 1 1/8" front wheel cylinders should work just fine on the fronts. The rear is where you play around usually between 15/16" or 7/8"

 

I should have been more clear in my post. I meant the stock front wheel cylinders from the donor vehicle the 11" brakes were removed from.
These are typically 1 1/8" bore wheel cylinders.

 

I went ahead and ordered the cylinders listed on Rock Auto for a '76. Thanks everyone!