RE: [DML] Rear Calipers on Ebay

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Harold, Don't take this the wrong way, but do you want them on your car. If
so I will do the Hervey thing to them and trade you. No charge. I'm ready to
send them back. I just can't in good conscience send them out.
John :-)



-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Harold McElraft
Sent: Thursday, March 29, 2007 7:42 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Rear Calipers on Ebay

Actually from the physics thing - I think you will find that force 
being applied at the caliper from the brake pedal is unchanged and 
the pistons are the distribution medium. Therefore, the force is the 
same it is just being distributed over a smaller area. Does that make 
a difference in the braking? I don't know because the action on the 
pads would have to be evaluated - but, I doubt if much is lost.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, "Tom Tait" <TTait@...> wrote:
>
> (note - I'm not an automotive engineer, but this is pretty basic 
physics
> and common sense)
> 
>  
> 
> If one uses the same brake pads, then the stopping power will be a
> factor of how hard those pads are pressed onto the rotor.
> 
>  
> 
> You could compensate for a smaller piston by pressing harder (5% I'm
> guessing without doing the math) and get similar braking results 
with
> the following caveats:
> 
>  
> 
> If you can't push hard enough to nearly lock up your brakes, then 
you
> are not reaching your full braking power - its' unlikely that 5% 
would
> make a difference for most drivers, but it could.  Once you push 
hard
> enough to lock up the brakes, its all equal anyway.
> 
>  
> 
> The smaller rear calipers will shift more of your braking power to 
the
> front of the car, but not as much as the saab master would shift it.
> 
>  
> 
> A smaller caliper pushing into the back of the pad may distribute 
the
> force onto that pad differently than the larger one would, causing
> slightly decreased performance or pad life, particularly as the pad
> wears thin.
> 
>  
> 
> How you feel about this stuff depends on how you drive your car, and
> what you expect from your brakes that one time every 5 years that 
this
> might make a big difference.
> 
>  
> 
> My understanding is that the castings are nearly identical, and 
coming
> from the same factory.  Based on the production dates it seems that 
the
> Jag brakes pre-date the Delorean brakes.  What is it about that 5mm
> difference that made the original engineer at Delorean, who had to 
make
> the call, decide to go with a new casting and part, rather than an
> existing one?  Maybe it was so the parts department at the Delorean
> Dealers could charge more for their part, or maybe it really makes a
> difference.  
> 
>  
> 
> They are your brakes, it's your wallet and your butt in the seat.  
I'm
> not sure myself if the difference is really that important to the 
casual
> driver,  but I think John is doing service to more than his own 
business
> by pointing out that there are differences and letting us all 
decide if
> or how they affect us/
> 
>  
> 
> Like most things here - you have to make that final determination
> yourself.


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