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Re: [Fot] Restrictor Valve

To: Bob Kramer <rkramer3@austin.rr.com>
Subject: Re: [Fot] Restrictor Valve
From: <jerryvv@roadrunner.com>
Date: Thu, 11 Mar 2010 10:31:59 -0500
Bob, a bigger question is do we know that the current product is being molded 
from the proper rubber compound. That certainly applies to many of the rubber 
bits that are used in non-performance applications and I suspect on some of our 
engine and transmission mounts that are now being made in unknown foreign 
factories. 
Rubber compounds are designed for specific applications and heat and fluid 
resistance are two of the most critical conditions that rubber development is 
focused around. I believe Neoprene is the polymer of choice for brake 
components however that's just a starting point. From there a specific compound 
is developed using the base polymer. Once the compound is developed testing is 
done to what's known as a Line Call out to certify that the compound meets the 
design requirements.

I certainly hope that these rebuild kits are still being manufactured by 
Girling or Lucas or some other reputable supplier. A no name box would give me 
concern. I've seen a few of those with brake parts in them. Not to mention the 
assumed liability.

JVV

---- Bob Kramer <rkramer3@austin.rr.com> wrote: 
> I'd like to change the topic a little, to caliper seals and how long they 
> last under racing conditions. I just came back from a weekends racing and 
> rebuilt my calipers. The late TR4/early TR6 style calipers have one inner 
> ring and a rubber boot type seal. In mine the boots were crispy, crumbling 
> to the touch and one of the 4 inner rings had heat damage. I can only assume 
> that the little rubber seal between the halfs is also heat damaged. I had 
> spares ready so the job is done but I'm just a bit curious if everyone is 
> frying these like I am. Mine were on there for nearly 4 years of racing.
> 
> Bob Kramer
> Volente, TX
> 
> Perfection is not attainable, but if we chase perfection we can catch 
> excellence.
> Vince Lombardi
> ----- Original Message ----- 
> From: "MadMarx" <tr4racing@googlemail.com>
> To: "'Randall'" <tr3driver@ca.rr.com>
> Cc: <fot@autox.team.net>
> Sent: Thursday, March 11, 2010 2:19 AM
> Subject: Re: [Fot] Restrictor Valve
> 
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