rst in breaking

iTrader: (2)

im wondering whats the best set up to go on a rst, with the issue being 4wd are single pot but larger piston and compared to the 4 pots? and why would ford change them to single pots? cheers

Rab

4x4 engine braking was stronger because of the transmission. Hence less of a need for brakes.

2wd calipers all the way

rst in breaking

iTrader: (2)

cool, i was reading on an add for sale he'd upgraded to 4wd calipers which confused me and made me think lol

Rab

Hmmm. Upgraded to single pot calipers?

AndyPen

iTrader: (24)

Deffo 2wd ones for best stopping imo

orion_crazy_carl

iTrader: (3)

i got some 4wd ones for sale now m8 if u need some

rst in breaking

iTrader: (2)

nope not for me lol, i dont like the look of the 4wd ones, they look a little gay behind 17's lol, would have only considered them if they were better due to the larger piston possibly having made them better

Ginge !

the 4x4 saphs where made to a smaller budget unlike the 2wd's hence most stuff for 2wd is practically bespoke and the 4x4 is a bitsa

saying that the 2wd calipers are transit 4 pots with spacers to allow for wider brake discs anyway

orion_crazy_carl

iTrader: (3)

as brakes,there a good cheap upgrade,they work superb on a escort/orion,like u say,i only got ur alfa ones as thery look nicer behind the wheel!!but they dont look tht bad

rst in breaking

iTrader: (2)

its more me being fussy tbh as being single pots they look no diff from standard really and doesnt look nice behind the wheel

glancy2081

the 4x4 ones are better because the two pistons create a greater clamping fource than the four pots due to more surface area

Spiky

iTrader: (1)

single pot slider Versus 4 pot caliper


it's a no brainer...

The Youth.

iTrader: (1)

actually, the 4x4 pistons are like bin lids and work very well.
I'm sure in back to back tests there is no difference in performace between the 2
how many 2wd owners can honestly say that all 8 of there pistons are actually working, 20 years of use will have fooked them up..
at least 4x4 owners only have 2 pistons to worry about lol

steve

D7AKE

1 of my pistons are sticking on mine and its a pain as its just a road car...another 75 up the swanny...

Paul_RS

iTrader: (4)

Ford themselves say the 4x4 caliper is better than the 2wd one.

Just because its 4 pot doesn't mean anything, they are a relativley tiny caliper with tiny pots...

kellyalfie

2wd better bigger

The Youth.

iTrader: (1)

bigger in what way???

steve

Ginge !

they would say that,, reality is more pistons are better,,,, hence you dont get ferraris with single sliding calipers,,,, thought that would be easy to understand

marketing is one thing but reality is another

xr_craig

iTrader: (2)

But even bearing that in mind a lot of the 4x4 stuff found it's way onto a homologated rally car? Which wouldn't have been a small budget due to the purpose of it's build

JjCoDeX75

Had both, and the 2wd ones were better - noticeably

JJ

andrewg

4x4 ones still work well when they are old ,,seen loads of seized pistons on 2wd

they both look gay behind big open wheels

Trotter

The 2wd was designed for 300bhp but was cut back to 204bhp,the 4x4 had brakes to suit its power,the engine was also upgraded to handle the stress from extra grip.

tabetha

Homologation means using original parts, ford are not going to say these later 4wd calipers are crap when that is thier current car for sale at the time are they ?
Can anyone honestly say they have ever seen a set of pads in a single pistons sliding caliper wear perfectly matched either side of the disc, so a lot of the force goes in binding of the slider mechanism, and four pots equal more consistent pad pressure so not developing hot areas unlike a single piston one just pressing in the middle, they also have more mass to dissipate the heat.
tabetha

coswurv

iTrader: (8)

what he said.

dojj

iTrader: (3)

the king of being confused is really confused now

the 4wd cars had single sliding calipers
the 2wd cars had fixed 4 pot calipers
it's generally agreed that the 4 pots will spread the load across a greater area more evenly than a single pot sliding version

where has the second pot come into the equation then?

besdies, if you want cheap effective stoppers, mondeo mk3's had 300mm discs and single pots and if it's enough to work on something like the st220, it'll be more than enough to work on the little escort mate

Ryan

i got a excellent condition 2wd setup that came off my 36k 3dr

including discs and pads.

BillyCabrio

iTrader: (1)

The 4x4 ones bolt straight on, the 2wd ones need machining.

Turbosystems

iTrader: (5)

interesting views
the facts are that a 4x4 caliper generates more clamping force than the 2wd 4 pot due to piston surface area

The Youth.

iTrader: (1)

I did hint at that tony but I didn't want to get shot down by all the 2wd owners!

steve

Ryan

i've heard it also ages ago.

dojj

iTrader: (3)

if you don't mind me asking, how is this possible?
you have the same pressure being applied so i would have thought there was no actual difference in pressure on the pads, the only difference being in the area it was alliped
the 2wd caliper having a more even spread whereas the 4wd caliper would apply it on a leading/trailing side of the disc

not that i want to start a row or anything i just want to know as if there is a recognised mechanical principle invovled here that is not common knowledge it would be good to have the info out there

although i'm not sure what it would do to sales of multi piston calipers

Spiky

iTrader: (1)

i fail to beleive the 4wd is better than the 2wd

Trotter

as i have said the 2wd was way over engineered,the 4x4 was not.It all came down to costing and profit.

boothy

iTrader: (14)

IVE GOT 4X4 ON MY ESCORT,my mate said they are better because most of the 2wd ones aint working that well anymore

Ryan

yeah thats always the way, but working one work very well.

mine on the nurburgring proved that, although after 1 lap they were a little spongey

but that was down to fulid and lines.

Turbosystems

iTrader: (5)

why

dojj

iTrader: (3)

as i see it, if you pres the pedal with force X the fluid in the lines will see force X and the caliper will see force X
but on the 2wd version, force X is applied to 2 parts of the pad (top and bottom) on both sides so you get (essentially) an equal distribution of pressure across both sides of the pad and onto both sides of the disc

with the 4wd setup you have force X pushed onto the inside pad first, this in turn pushes against the inside face of the disc, which pushes against the sliders, which then pull the other side of the caliper towards the other face of the disc, pulling the outer pad in towards the outer face of the disc

much more losses and uneven pad wear as the inner pad will, invariably, wear out quicker as it's in more use

the only positive side is that you have the full force of X hitting the inner pad first and, as the piston is going to require less fluid to push it out, it "should" give you a better feel through the pedal

in the real world i felt that multi piston calipers gave an easier "on the limits" feeling through the pedal as to when they were about to lock up or not

unless of course we are only talking about the cosowrth 2/vs 4wd set ups, in which case, the 4wd setup might win on the bais of unsprung weight

Turbosystems

iTrader: (5)

dojj there is no real measurable force required to slide the caliper they only wear when the slides/pads are rusted and sticking due to old age and poor maintenance and pad fitting.

Matt Evans

I ran both set ups, ie 2wd 4 pot calipers, 285mm dics, and 4wd single pot caliper and 285mm disc on my old 247bhp S2 trackcar.

in respect of stopping power, both were equally as good. HOWEVER, the 4wd calipers used to warp discs like no tomorrow. Probably caused by the unequal pressure on each side of the disc?

Got through god knows how many discs and pads it was shocking. Fcuked the lot off in the end and got BG developments to build me a AP racing 4 pot brake kit.

best mod i ever did!

orion_crazy_carl

iTrader: (3)

u could always get 4x4 calipers and get these
http://cgi.ebay.co.uk/ws/eBayISAPI.d...ayphotohosting