Re: [DML] Rear Calipers on Ebay
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Re: [DML] Rear Calipers on Ebay



John - You know I don't like to stray far from OEM on mechanical 
things unless there has been complete testing done so I would not put 
them on my car. Steve set me straight on the calipers effectiveness - 
I think one might be asking for some trouble and safety concerns by 
using them.

Harold McElraft - 3354

--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote:
>
> 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.
> 
> 
> [long quote trimmed by moderator]
>




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