<VV> Re: BRAKE FAILURE

[Ron]

You cannot feel any compressibility with DOT 5.  I think the talk about it 
is lots of hot air about not much.
RonH

----- Original Message ----- 
From: "Bill Elliott" <Corvair at fnader.com>
To: <N2VZD at aol.com>; <virtualvairs at corvair.org>
Sent: Thursday, July 07, 2005 5:01 AM
Subject: Re: <VV> Re: BRAKE FAILURE


>
>
>>i find it highly unlikely that silicone brake fluid was the cause of any
>>brake failure , unless it was used in an abs system (manufacturers advise
>>against). there had to be some other reason .if it was not installed
>>properly(comeplete flush of system or better yet comeplete rebuild or 
>>replacement of all
>>components) sure it would fail, as would dot 3 or whatever.  let common 
>>sense
>>prevail?
>>regards, tim colson
>
> Common sense says that if silicone fluid is several times more 
> compressible (especially when very hot) than glycol fluid and that extra 
> compressibility was the
> difference in brakes applying before the pedal hit the floor or the pedal 
> hitting the floor before sufficient pressure was built in the system would 
> indeed cause
> brake failure.
>
> Of course you can argue that the brake system was put together improperly 
> (as I mentioned in my last email) or very poorly adjusted, but the fact 
> remains
> that due to the compressibility of silicone fluids (several times greater 
> than glycol) you have less of a margin of error for this type of failure. 
> Unless you are
> trying to say that there is NO difference in compressibility between the 
> fluids, how can you argue that this is incorrect? Let common sense 
> prevail.
>
> In the complete failure that I mentioned, we found no obvious cause of 
> failure except that the pedal was a bit low. EVEN AFTER THE FAILURE, the
> brakes worked fine when cold and in normal use. In the situations where 
> there was a partial failure (pedal going to the floor but the system 
> applying some
> braking power) the findings were similar. This was in a professional 
> Corvair repair shop, not a shadetree mechanic.
>
> Bill
>
>
>
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