Gaberpot

Hey fellas, I currently swapped my is300 with ls400 brakes and the pedals stayed relatively soft and slowly sinks. So I clearly have a fluid leak, and I’ve traced it to my LH ls400 caliper. One of the t47 Torx bolts holding the half’s together, has a leak from it, I haven’t split the caliper in half yet, but I was told the o rings inside the center section are what’s causing the leak, and that there is no replacement part for it. Has anyone come across this, and if so, any remedy? The circled t47 bolt is the one it is leaking from

paulo57509

O-rings typically come in standard sizes. You should be able to match the existing o-rings with a standard sized o-ring.

However, car manufacturers (especially Asian manufacturers, Honda in particular) are notorious for using proprietary sized o-rings and not more common, standard sizes. Once you find the correct size (OD, ID, width/thickness, square x-section) you need to make sure that the material the o-ring is made out of is compatible with brake fluid.

The simple answer is to get new/rebuilt calipers.

AleksLZCR

Yeah this happened to me on mine when I changed the pads and compressed the pistons. Just old rubber being old rubber. Got a remann from aap for about $70 and that solved my problem

timmy0tool

iTrader: (7)

i hope the chroming process didn't compromise the metal to cause leaks, unless it was just buffed to a mirror shine!
you will have to split the caliper to inspect. start by removing the leaking bolt and go from there.