Brake Master Cylinder Seal Failure
10-20-11 | 04:19 PM
#3
Sounds very strange. I've never had this happen or heard of this happening in 22 years of owning Toyota vehicles. Are you SURE your dealer isn't doing something wrong, especially after this happening repeatedly to you?
10-21-11 | 11:22 AM
#6
Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
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From: Under an IS F since 2008
So it's very important to only use OEM Brake fluid with the right polymers.. 
or Aftermarket fluids with the right polymers..
~ Joe Z
or Aftermarket fluids with the right polymers..
~ Joe Z
Last edited by Joe Z; 10-21-11 at 12:01 PM.
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10-21-11 | 08:55 PM
#8
Boilover in an IS-F? So not likely it isn't even funny. Even at CMP with brakes hot enough to crack the rotors, the fluid did not boil. This isn't an issue anyone has experienced with an F regardless of fluid. I run Brembo LCF and have for some time (2 1/2 years) without any issues. I completely faded full race pads without boiling the brake fluid after the stability controls spent the better part of the day compensating for my lack of skill.
Sorry I misread your post - it read like you'd personally had this issue with more than one Lexus - GS, IS, and RX. I also owned a 2006 IS 350 from new to December 2008 and did not have the issue in the LSB.
Sorry I misread your post - it read like you'd personally had this issue with more than one Lexus - GS, IS, and RX. I also owned a 2006 IS 350 from new to December 2008 and did not have the issue in the LSB.
10-21-11 | 11:35 PM
#9
Lexus Test Driver
Joined: Aug 2005
Posts: 1,049
Likes: 7
From: VA
It's a typical failure mode for many automobile brands with power brakes. Happened to a Porsche 928 I ownded a while back.
10-22-11 | 08:06 PM
#10
Lead Lap
Joined: Oct 2005
Posts: 647
Likes: 2
From: Ontario
Yep, quite common for us long term '06 IS owners and Honda also had the same issue this year 
Actually, leaking master cylinder seals causing loss of brake fluid through the brake booster is not uncommon at all and I'm going back to Mark X and Mark II Jaguars,..jeese I'm dating myself. .Must of been a bad batch of seals.
Actually, leaking master cylinder seals causing loss of brake fluid through the brake booster is not uncommon at all and I'm going back to Mark X and Mark II Jaguars,..jeese I'm dating myself. .Must of been a bad batch of seals.
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