[Fot] Restrictor Valve

[jerryvv at roadrunner.com]

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 at 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 at googlemail.com>
> To: "'Randall'" <tr3driver at ca.rr.com>
> Cc: <fot at autox.team.net>
> Sent: Thursday, March 11, 2010 2:19 AM
> Subject: Re: [Fot] Restrictor Valve
> 
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