G60 brakes

Bernie Benz b.m.benz at prodigy.net
Mon Jul 8 13:23:41 EDT 2002

> From: Phil Rose <pjrose at frontiernet.net>
> Date: Mon, 8 Jul 2002 10:34:30 -0400
> To: Bernie Benz <b.m.benz at prodigy.net>
> Cc: 200q20V mailing list <200q20v at audifans.com>
> Subject: Re: G60 brakes
> At 9:47 PM -0700 7/7/02, Bernie Benz wrote:
>> Phil,
>> If the externals of your G60s, the guide pins, were found to be in such poor
>> shape, do you assume that the internals are any better?
> One guide pin out of four was in bad condition.
IMO, impossible.  You must have an unrealistic defination of what
constitutes a "bad condition".
Examples:  A positively frozen guide pin(s), as you described, would cause
the outboard pad to be ineffective, shifting all braking force and wear onto
the inboard, piston loaded pad.  Contrast this to a stiff guide pins
condition, in which the outboard pad would apply with high hyd. pressure but
would not release, so would drag until it wears free.  This must be your
stated second caliper condition, there is no other plausable rational for
uneven pad wear which is excessive on the outboard pad.
>> You don't need
>> guide pins if the pistons are frozen, you know!
> Izzat right? Pistons were not frozen.
>> I assume that you did not
>> overhaul the calipers at the same time and flush the fluid on all four
>> corners, or you would have added further detail to your tale of woe.
> Full fluid flush planned for today.
A fluid flush is at best a preventative against further, future
deterioration of the hydraulic system.  It can not correct existing
problems, such as frozen, sludged up, or not retracting pistons.  IMO,
having a "new" 11 year old car without hard service history, one must assume
the worst, that the fluid has never been changed and that the hyd system is
all sludged up and pistons are not retracting properly.  Please, do a full
bore hydraulic overhaul, all 4 calipers, before letting your wife "drive it
around town".

> Phil
> --

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