I'm confused, wheel cylinder bore

Alright, I'm now confused...

The front wheel cylinders on my cj are 1" bore and the back are 3/4", I thought that they might be reverse but I search and a 1 inch bore on front is normal... I had thought you wanted the front brakes to do more of the stopping then the rear, than if they both get brake fluid pushed into them, the 3/4 inch bore is going to push out a heak of a lot faster... which is one of the things my old brakes were doing... the rear was stopping the car, and the shoes show it. almost gone in the rear while virtualy untouched in the front... The only expination would be the MC has diffrent bores for front and back, but it just seems like this would just cancel out the diffrence...

I'm confused...
(stupid physics class, I wouldn't have noticed if I was ignorant of it)

 

I believe it's just the opposite...the larger 1" pistons should deliver more force than the smaller 3/4". The hydraulic pressure would be the same, and pushing against the larger area of the bigger pistons. But what do I know. Sounds like there's also some other issue keeping your fronts from working correctly.

 

:iagree:

is it possible your brakes need to be adjusted?

 

What drum size do you have ?
I use a 10" drum and the front wheel cylinder is 1 1/8" and the rear is 1". I drive my jeep from 1987 using this size.

Ziv

 

What ever the other issue may have been should not be a problem anymore... The only thing left of my old brake system is the pedal... I took everything out, MC, lines, hoses, cylinders, drums, shoes. I'm just in the process of reinstalling them and was wondering if I am putting them back on correctly...

I was thinking more of volume... it takes more brake fluid to fill a larger bore.

My drum size is 10"... I'm putting on the same size cylinders that I'm taking off, and apparently its normal that the front bore is larger than the rear, so I'm not that worried anymore. But I still am wondering why this works. maybe a physics major will pipe in

 

Try this..... if you put 10 pounds per square inch against 1 square inch, you have 10 pounds of force. You put that same 10 pounds per square inch up against 10 square inches, you now have 100 pounds of force.

Clear as mud?

PS, no physics major here, I just read a lot.

 

It actually does make sence, especialy if the MC and diffrent bores so that the front and rear extended at the same rate, so that there is more force in the front. physics