Following the owner's manual is a safe statement to make. No doubt that Lexus uses hoses far beyond the quality of...say, KIA.
Test the cooolent for ph and strength, if it is not satisfactory, use a one step flush and refill w/new coolent. I would guess Lexus hoses good for 10 years. At high rpm, heater hoses are subject to about 45psi (due to the restriction of the thermostat to coolent flow), so be sure to change them when the radiator hoses get changed out(at some distant date).
If the coolent is original, it should be replaced at 5 years. If the gasket of the radiator cap smugges black on your finger when rubbed. Replace it, not with a cheap Stant but a dealer OEM cap. A bad radiator cap is the prime offender for poor cooling system performance.
Inspect the hoses for wear from rubbing anything that touches them.
Very important to look at the fins of the a/c condenser and the radiator for blockage caused by bug bodies.
I spray these finned areas with very soapy water when they are cool, let it soak a long while, then blow out the critters with clear water. Don't use real high pressure or the fins will bend. Not sure what the bug population is like in your local.
Yes! At 5 years it is a very good idea to have the brakes bled until clear fluid comes out. If you have this done, make sure high quality fluid(of factory spec) from freshly opened cans is used, not some crap in the shop's old pressure bleeder.
Fresh fluid will really extend master cylinder life because it is a lubricant after all. The price of a good bleed is prolly only 7% or a master cylinder replacement.
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