[urq] RE : 85 - Brake conversion questions

[audijim at comcast.net]

I'm sure he meant that the cross section of the O-ring is square.

 -------------- Original message ----------------------
From: "Ingo Rautenberg" <i.rautenberg at waratap.com>
> L-A:
> 
> You mean the piston O-rings?  I think that's what you mean by square
> O-rings.  Hmm.  Interesting.
> 
> Ingo
> 
> ----- Original Message ----- 
> From: "Louis-Alain Richard" <laraa at sympatico.ca>
> To: <audijim at comcast.net>; <urq at audifans.com>; "Felix Tang"
> <ftang at dragonartz.com>
> Sent: Wednesday, November 15, 2006 2:00 PM
> Subject: [urq] RE : 85 - Brake conversion questions
> 
> 
> > Or, in my car, the problem was that the rear calipers were rebuilt without
> any
> > lubricant on the square o-ring... So they always dragged a bit after a few
> > hundred kilometers.
> >
> > I was able to pinpoint them with my new Mastercool Infrared thermometer.
> You
> > drive on a deserted road for a few km, then you coast to a stop without
> touching
> > the brakes, and shoot each disk with the IR thermometer. I discovered that
> after
> > replacing the brake hoses, brake cables, new disks and pads all around. I
> was
> > ready to order a new proportionning valve (since the MC was replaced 2
> years
> > ago) when someone told me to open the rear calipers to see if the pistons
> were
> > returning fully. All that was needed was some silicone grease on the
> pistons and
> > the square-section o-ring and the situation is corrected.
> >
> > Louis-Alain
> >
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