Re: [DML] Rear Calipers on Ebay

[DMCVIN6683 <dmcvin6683@xxxxxxxxx>]

As of right now I have the Saab M/C on my car. I hit the brakes hard  
and the ass end wants to swing around.

I cant see that 5mm will make that much of a difference in the piston  
size if you are running the correct M/C. Seems like they engineered  
it funny that way like some other parts on the car like the fuel  
sending unit where when it goes your kinda screwed.

Mark V



On Mar 29, 2007, at 7:04 PM, Tom Tait 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.
>
>
>
>
>
> From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On  
> Behalf
> 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 say
> 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 last
>> 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 Jaguar.
>> The difference is the rear Delorean caliper pistons are 48mm in
>> diameter and the Jaguar are 43mm in diameter. That doesn't sound like
>> 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 stores,
>> you to may have got the wrong part also. I have heard some people
>> boasting on other chat groups that they bought DeLorean calipers and
>> how much money they saved. I don't think you got DeLorean. You either
>> got Mercury Capri on the front and Jaguar on the back.
>> John Hervey
>> www.deloreanautoparts.com
>> www.specialtauto.com
>
>
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>



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