wheel cylinders stock vs s-10 manual

[monte olrac]

I was just wonder about the pro's and cons using the s-10 manual wheel cylinders vs the stock ones all i know is the s-10 has a larger (7/8) bore vs the (3/4) monte carlo but i don't know if there is an advantage or if on has a longer stroke any info would help.

 

[monte olrac]

 

[jrm81bu]

The advantage would come from the increased bore. That means more surface area for the fluid to press on, which means higher pressure applied to the shoes.

 

[monte olrac]

The advantage would come from the increased bore. That means more surface area for the fluid to press on, which means higher pressure applied to the shoes.

that makes sence, but what im wondering more is the stroke longer or shorter more pressure and less extention isn't really helping that much either

 

[jrm81bu]

There will be plenty of stroke in them. From brand new to completely worn there really isn't a lot of stroke involved. Not nearly as much meat on the shoes as there is on the front pads.

 

[monte olrac]

after changing out all the rear brake equipment my car finally stops like it should. After doing test with both types off wheel cylinders, I have to say that the stock ones are better if you have a stock system. since the s-10 have a 1/8 inch more bore you may gain contact area for the pads, but you do loose some stroke so all in all you can't put more pressure on the pads unless you can increase your pressure to the rear brakes.

This is just a FYI if anyone is intrested, Thanks Jrm81bu for your responses.

 

[jrm81bu]

since the s-10 have a 1/8 inch more bore you may gain contact area for the pads, but you do loose some stroke so all in all you can't put more pressure on the pads unless you can increase your pressure to the rear brakes. quote]

Sorry but I have to disagree with that. When you increase the piston diameter(even with the same pressure on the fliud side of the piston) the pad side of the piston will create more pressure. It's because you increased the surface area of the piston. Same deal with the front calipers, they have upgrades that are only slightly larger diameter pistons. This increase in surface area of the piston allows a greater clamping force even with the same input pressure.

 

[monte olrac]

I hear what you are saying, but you the force on rear pads is not increased, keep in mind the pressure is applied to edge of pad so you never gain surface contact with a larger bore cylinder, so you never get a increase in pressure. Unlike disk brake were your clamping force is contributed over a larger portion of the pad and rotor. But thats just a bunch of pascals laws and stuff, I know from my little experiment that there was a noticeable difference in pedal feel between the two and the stocker were much better, maybe someone else had better experiece with them. so maybe we have to agree to disagree, but you can check out this article to see what i was talking about.

http://science.howstuffworks.com/hydraulic1.htm

 

[pontiacgp]

I hear what you are saying, but you the force on rear pads is not increased, keep in mind the pressure is applied to edge of pad so you never gain surface contact with a larger bore cylinder, so you never get a increase in pressure. Unlike disk brake were your clamping force is contributed over a larger portion of the pad and rotor. But thats just a bunch of pascals laws and stuff, I know from my little experiment that there was a noticeable difference in pedal feel between the two and the stocker were much better, maybe someone else had better experiece with them. so maybe we have to agree to disagree, but you can check out this article to see what i was talking about.

http://science.howstuffworks.com/hydraulic1.htm

your wrong about there not being an increase in rear braking with the s 10 non power brake wheel cylinders...on a Grand National they can hold the rear wheels from braking loose up to 4 pounds of boost with the stock wheel cylinders...with the s 10 cylinders the rear brakes can hold the wheels from braking loose up to 8 pounds of boost....I know a speed shop where they specialize in Grand Nationals....theories are nice to read about but the real world is the best platform to test.....

another way to increase rear braking is to use two primary shoes on each side

 

[monte olrac]

I hear what you are saying, but you the force on rear pads is not increased, keep in mind the pressure is applied to edge of pad so you never gain surface contact with a larger bore cylinder, so you never get a increase in pressure. Unlike disk brake were your clamping force is contributed over a larger portion of the pad and rotor. But thats just a bunch of pascals laws and stuff, I know from my little experiment that there was a noticeable difference in pedal feel between the two and the stocker were much better, maybe someone else had better experiece with them. so maybe we have to agree to disagree, but you can check out this article to see what i was talking about.

http://science.howstuffworks.com/hydraulic1.htm

your wrong about there not being an increase in rear braking with the s 10 non power brake wheel cylinders...on a Grand National they can hold the rear wheels from braking loose up to 4 pounds of boost with the stock wheel cylinders...with the s 10 cylinders the rear brakes can hold the wheels from braking loose up to 8 pounds of boost....I know a speed shop where they specialize in Grand Nationals....theories are nice to read about but the real world is the best platform to test.....

another way to increase rear braking is to use two primary shoes on each side

You are very right about the real world, which is why I changed back to the stock cylinders. Keep in mind GN's have a different braking set-up from my monte carlo so maybe they had pressure to spare. All i know is that my stock cylinders stop much better than the s-10, So according to my car I am right.