Re: [DML] Rear Calipers on Ebay
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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 
> 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 
> the following caveats:
> If you can't push hard enough to nearly lock up your brakes, then 
> are not reaching your full braking power - its' unlikely that 5% 
> make a difference for most drivers, but it could.  Once you push 
> enough to lock up the brakes, its all equal anyway.
> The smaller rear calipers will shift more of your braking power to 
> 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 
> 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 
> might make a big difference.
> My understanding is that the castings are nearly identical, and 
> from the same factory.  Based on the production dates it seems that 
> Jag brakes pre-date the Delorean brakes.  What is it about that 5mm
> difference that made the original engineer at Delorean, who had to 
> 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.  
> not sure myself if the difference is really that important to the 
> driver,  but I think John is doing service to more than his own 
> 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.
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On 
> Of DMCVIN6683
> Sent: Wednesday, March 28, 2007 7:02 PM
> To: dmcnews@xxxxxxxxxxxxxxx
> Subject: Re: [DML] Rear Calipers on Ebay
> Why wouldn't these work correctly?
> Some of us have been using the wrong Master Cylinder for years with 
> no problems that has been proportioned all wrong so who is it to 
> these Calipers wont do the job being 5mm smaller?
> Mark V
> On Mar 28, 2007, at 6:38 PM, John Hervey wrote:
> > Group,
> > If you were bidding on or purchased rear calipers on ebay in the 
> > month I have some sad new. They are not DeLorean they are Jaguar.
> > Don't buy them and don't use them and don't put them on your car
> > unless you can confirm they are DeLorean.
> > I don't think the seller did it on purpose but I did send an email
> > and never got a reply.
> > I bought a set and got them in today and confirmed they are 
> > The difference is the rear Delorean caliper pistons are 48mm in
> > diameter and the Jaguar are 43mm in diameter. That doesn't sound 
> > much, but it could make a big difference in a jam not having that 
> > extra
> > 5mm size and volume for stopping.
> > Bidder #3 also bought some.
> > So be careful and ask before you buy any rear caliper.
> > For those of you that have ordered from Autozone or other Box 
> > you to may have got the wrong part also. I have heard some people
> > boasting on other chat groups that they bought DeLorean calipers 
> > how much money they saved. I don't think you got DeLorean. You 
> > got Mercury Capri on the front and Jaguar on the back.
> > John Hervey
> >
> >

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