scunyon

Sorry if it's been asked and I couldn't find it but will the rear brake calipers from the LS430 or LS460 directly bolt up to a UCF20?

timmy0tool

iTrader: (7)

very unlikely this was asked in the past since it's not common at all.

it is unknown to me for sure if this can be done however i can venture a guess that it will not work unless you shim the bolts and brackets due to a slight size difference.

go to rockauto.com and compare the different generation dimensions. start with the rotors and if they are almost the same size, then you don't have to shim the calipers as much.

YODAONE

Aside from whether LS430 or LS460 rear calipers are plug-and-play bolt-on proposition to a LS400, are there advantages for doing so? Improved design; increased clamping force or decreased mass (lower unsprung weight)?

RA40

iTrader: (6)

The 2-GS guys have gone through a variety of scenarios with calipers. Some of their BBK discussions would provide additional info. Bolt up not likely so a custom bracket would need to be fabricated.

PureDrifter

iTrader: (10)

will not fit at all.

LS430 are radial mount, LS460 are wrong bolt pattern

scunyon

Not to mention the rear discs on the 460 are bigger than the fronts on the 400. Oh well...

scunyon

Clamping force and aesthetics mostly. The weight savings, if any, would probably be negligible at best.