Lexus rear brake callipers

[steve2006]

Given the well documented problems with Lexus models rear callipers seizing due mainly to lack of maintenance on the slide pins ( not even a Lexus service item) why are these single piston callipers still being used even on new models?

Back in 2001 with the introduction of the LS430 Sumitomo twin pot callipers were fitted  on the rear brakes effectively eliminating the slider pin problem but this as far as I know was the only model at the time to get them.

All other Lexus models with a few exceptions like the ISF and RCF continue to this day to use single piston sliding callipers.

”In pursuit of Perfection” I think Lexus gave up running when it came to rear brake callipers.

[McShmoopy]

Being a MK2 IS250 owner who has suffered these seized callipers for a while, its not necessarily the single piston thats the issue but the blind slide pin bolt and the poor rubber boot design that causes it to get seized up. I found that even with greasing you had to ensure it is seated properly otherwise dirt debris will get into it and eventually cause the seizing.

This then leads to the actual piston to start seizing eventually and its a downward spiral from then, its quite poor that Lexus doesnt regrease this as a service item but they'd rather replace the calliper entirely. Most local garages never tend to deal with specific issues like our seized callipers so they just service them as normal which then inadvertently causes the same issue happening. Best to take it to a specialist garage or do it yourself, I'm cheap so I'll do things myself and atleast ensure it's done properly. Once you completely refurb the calliper with new piston, rubber boots and new greases absolutely zero complaints with the brakes now ! 

[J Henderson]

I had to free up one of my rear calipers a few weeks back.

I don't think it's just Lexus that persist in using these type of calipers. Even the high-end hot hatches with 300+ Bhp, or BMWs with optional "M-Sport" brakes have one of these weedy-looking 2-piece calipers on the rear.

I guess its probably a cost thing, but how a caliper made up of several parts, would be more cost-effective than a monobloc one, I don't know.