twin piston caliper options.

[MR22ZZ]

I was wondering if anyone was aware of any bolt-on brake caliper options that would fit 275x25mm discs.

It appears that the Celica ones I was hoping for may require some modification to fit, and the particular model is hard to find so looking at other options.

Cheers

[JustCallMeOrlando]

Man I ask why twin?

[oldcorollas]

maybe rim clearance?

55mm?

as for similar sized disks... maybe R32/300ZX (280mm) or celica ST202 perhaps?

[MR22ZZ]

The stock calipers are single pistons and looking for an increased piston area / clamp pressure. If you know of a 4 piston alternative that would be even better... overkill, but better. And yes, needs to fit under 16-17 inch rims (16 pref)

[MR22ZZ]

55mm?

yes that appears to be the stumbling block. I can find 277x28mm Celica ones. Not sure if they will bolt on though without much modification.

[oldcorollas]

ahh

opposed twin will be no better for clamping force than a single slider.
a twin slider has a relatively fixed disk width, because it's hard to alter the width of the sliding part.

and most disks are less than 30mm in thickness.... 55mm is huge!!!

i suppose the only way would be to get a 4 pot, or two pot opposed caliper, then make a 20-30mm spacer for the middle, and use longer bolts?

if i may ask, what vehicle has a 55mm thickness brake disc? must weigh a ton!

any possibilities of using thinner discs? like 30mm?

[JustCallMeOrlando]

Are you sure it's 55mm and not 25mm or something?

[MR22ZZ]

typo... I meant 25mm

[oldcorollas]

going by here http://toymods.net/forums/showthread...=st202+caliper

St202/204 is 277x25 anyway and twin piston?

[YLD-16L]

Git farked!!! I just wrote a whole heap of great info and then was required to re-log-on and lost it all but in summary

Your disc is:

255mm diameter
49.5mm height
25mm disc thickness
55mm centre hole
4 bolt (4x100PCD)

The ZZT231 Celica uses:

275mm diameter
49.5mm height
25mm disc thickness
55mm centre hole
5 bolt (5x100PCD)

Redrill this disc and it would be a factory fit. Perhaps the calipers from the same celica may be a bolt on option?? Worth looking into!

Measure the bolt spacing on your caliper (mounting bolts) and that will let us tell you what other calipers may bolt on.

[MR22ZZ]

I have a ZZE-123R, not a ZZE122

Discs are the same as the Celica ones just 4x100PCD, and the ZZT231 Celica calipers are single piston as far as I am aware.

I'll measure the bolts tonight

I'm thinking the ST202 may be the way to go

[RONA]

YLD-16L FYI you can press back your post will still be typed, copy, re login, paste and voila no lost info

[Joshstix]

I'd be surprised if you saw a whorthwhile increase in braking performance just by increasing the piston count/area of the front calipers on the same size rotor.

If you want a good improvement it's time to either get a larger diameter disk or pads with a higher coefficient of friction.

This is under the assumption that the stock calipers are not total rubbish and operate as good as a basic single piston caliper ought to.

[MR22ZZ]

The thing I notice about the standard brakes is the area of the pad relative to the piston. It seems to have a large surface area for a single piston caliper setup so I worry about the evenness of the clamping force. Wouldn't changing to a twin piston setup even out the pressure applied to the pad?

[YLD-16L]

YLD-16L FYI you can press back your post will still be typed, copy, re login, paste and voila no lost info

I did that and it came up with the text box blank

I'd be surprised if you saw a whorthwhile increase in braking performance just by increasing the piston count/area of the front calipers on the same size rotor.

True, the guys who change from the sinle piston calipers on their ST162s to the twin ST165 calipers often say the difference is not noticeable.

I have a ZZE-123R, not a ZZE122

Ahhh my bad, so you have 275mm discs already.

I would be wary of just changing the caliper from what you have to the ST202 caliper then, as you will fitting an older caliper and most likely not making any gains, unless of course the swap is also to a larger diameter disc.

What is the pad size like on the ST202 caliper compared to what you have now?