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Car Forum / Ford / Ford Mustang / September 2006

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1990 GT Rotors and Calipers

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azjeweler@gmail.com - 06 Sep 2006 07:42 GMT
I have aquestion about rotors and calipers on a 1990 GT.  I need to
replace my rotors and calipers and I have been told to go with
PowerSlot rotors and I have also been told that just going with stock
is fine.  Does anybody have any insight into this???  Would also like
some ideas on calipers, stock or aftermarket???

Thanks Guys
Chris Stowell - 06 Sep 2006 10:44 GMT
> I have aquestion about rotors and calipers on a 1990 GT.  I need to
> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 3 lines]
>
> Thanks Guys

The stock calipers are fine for street use. Cobra upgrades are sweet,
but require a swap of hubs/wheels, so maybe a bit too much hassle.

Personally I've found the cheapo reconditioned calipers (AC Cardone) at
Kragen to be fine. The best value for money rotors I've found are the
standard Brembo rotors at Tire Rack (same as come with the cobra brake
kits but smaller), they're not much more money than the cheapo rotors
but the quality is in another league. They are also about half the
price of the PowerSlot rotors.

The biggest difference you'll feel is with upgraded pads. I'm growing
to love the Hawk HPS pads, miles better than stock. Great feel, but at
the expense of a little dust.

I guess it depends on budget, just remember that replacing old rotors
with new cheap ones can be false economy if you tend to give them a
hard time. If you're light on brakes then you'll be fine sticking to
the stockers. If you drive like a loon then upgraded pads and rotors
will provide additional braking power (pads) and longer life (quality
rotor).
.boB - 06 Sep 2006 14:56 GMT
> I have aquestion about rotors and calipers on a 1990 GT.  I need to
> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 3 lines]
>
> Thanks Guys

    Slotted/drilled/dimpled rotors are for looks only.  They actually decrease brake
performance over a stock type solid rotor.  It's all about surface contact area.

Signature

.boB
Arrived:  2006 FXDI, Red.
1997 HD FXDWG - Turbocharged   Stolen 11/26/05 in Denver
    1HD1GEL10VY3200010    CO License J5822Z
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra -  427W EFI, Damn Fast.

dwight - 06 Sep 2006 18:46 GMT
>> I have aquestion about rotors and calipers on a 1990 GT.  I need to
>> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 7 lines]
> decrease brake performance over a stock type solid rotor.  It's all about
> surface contact area.

Oh, I have to disagree strongly with this. In theory, that may be true, but
the stock Mustang rotors on my '93s were CRAP. The PowerSlots GREATLY
improved braking on both of my cars.

The stock rotors warped on TFrog within the first year, and I wasn't exactly
driving Watkins Glen.

dwight
.boB - 07 Sep 2006 00:48 GMT
>>>I have aquestion about rotors and calipers on a 1990 GT.
>>
>>    Slotted/drilled/dimpled rotors are for looks only.  They actually
>>decrease brake performance over a stock type solid rotor.  It's all about
>>surface contact area.

> Oh, I have to disagree strongly with this. In theory, that may be true, but
> the stock Mustang rotors on my '93s were CRAP. The PowerSlots GREATLY
> improved braking on both of my cars.

    Think how much better they would be with more surface area.

Signature

.boB
Arrived:  2006 FXDI, Red.
1997 HD FXDWG - Turbocharged   Stolen 11/26/05 in Denver
    1HD1GEL10VY3200010    CO License J5822Z
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra -  427W EFI, Damn Fast.

dwight - 07 Sep 2006 03:21 GMT
>>>>I have aquestion about rotors and calipers on a 1990 GT.
>>>
[quoted text clipped - 7 lines]
>
>     Think how much better they would be with more surface area.

I think more about heat. As in the voluminous clouds of white smoke coming
from my stock rotors.

dwight
WindsorFox - 07 Sep 2006 16:35 GMT
>>>>> I have aquestion about rotors and calipers on a 1990 GT.
>>>>    Slotted/drilled/dimpled rotors are for looks only.  They actually
[quoted text clipped - 9 lines]
>
> dwight

    Pics?? Lord knows you have pics of everything else including a
squatting earth pig...   LMAO!!

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

dwight - 08 Sep 2006 03:20 GMT
>>>>>> I have aquestion about rotors and calipers on a 1990 GT.
>>>>>    Slotted/drilled/dimpled rotors are for looks only.  They actually
[quoted text clipped - 12 lines]
>     Pics?? Lord knows you have pics of everything else including a
> squatting earth pig...   LMAO!!

Touchy subject - we haven't seen that pig in quite a while. We're afraid he
wandered into the wrong back yard and was sent to Pig Heaven.

dwight
WindsorFox[SS] - 08 Sep 2006 04:46 GMT
>>>>>>> I have aquestion about rotors and calipers on a 1990 GT.
>>>>>>    Slotted/drilled/dimpled rotors are for looks only.  They actually
[quoted text clipped - 16 lines]
>
> dwight

   Awww, that's too bad. I still see my bunny every so often.

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

Deputy Dog - 09 Sep 2006 03:25 GMT
> > squatting earth pig...   LMAO!!
>
> Touchy subject - we haven't seen that pig in quite a while. We're afraid he
> wandered into the wrong back yard and was sent to Pig Heaven.
>
> dwight

"BURP"  {wiping BBQ sauce off face} sorry about that!

Dave
dwight - 09 Sep 2006 13:26 GMT
>> > squatting earth pig...   LMAO!!
>>
[quoted text clipped - 7 lines]
>
> Dave

Cold.

Eh, plenty more where that one came from. Now I can rent out the duplex
underneath my shed.

dwight
WindsorFox[SS] - 09 Sep 2006 20:25 GMT
>>>> squatting earth pig...   LMAO!!
>>> Touchy subject - we haven't seen that pig in quite a while. We're afraid
[quoted text clipped - 13 lines]
>
> dwight

  Um, eew. Somehow eating a gopher seems as repulsive as eating a rat.

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

Deputy Dog - 10 Sep 2006 21:08 GMT
> >>>> squatting earth pig...   LMAO!!
> >>> Touchy subject - we haven't seen that pig in quite a while. We're afraid
[quoted text clipped - 15 lines]
>
>    Um, eew. Somehow eating a gopher seems as repulsive as eating a rat.

to me an earth pig was or should I say is a Ground Hog, and they are tastey
if cooked right. bout 10 times the size of a gopher!

Dave
.boB - 08 Sep 2006 00:44 GMT
>>>>>I have aquestion about rotors and calipers on a 1990 GT.
>>>>
[quoted text clipped - 12 lines]
>
> dwight

    Then something is wrong.  I use a stock replacement solid rotor front and rear.
 I spent the day at the track yesterday; really wailing on those brakes.  Hard into
turn one from 130 to 60 in about 2-3 car lengths.  Over and over, 30 minutes at a
time.  They smell good, but never smoke.

    Brakes work by converting rotational energy into heat energy through friction.
Greater friction occurs with increased surface contact area.  Cutting slots and
drilling holes decreases surface area of the rotor.  It's like saying, "I need better
brakes, so I'll install smaller rotors."   Doesn't make sense.

    The original purpose for drilling and slotting rotors had nothing to do with
temperature control  In the olden days, racing pads would outgass under heavy use.
The gas pocket would get trapped under the pad, and prevent contact.  The holes and
slots were there to allow the gas to escape.  Modern brake pads don't outgass, so
there's no need for that.  Modern replacement rotors are drilled/dimpled/slotted
because people like the look, and don't use their brakes enough for it to matter.
They're for the ricer and wannabe racer crowd.

   Brakes that need extra cooling should have a better vanes, and more air flow into
the center of the rotor.  That's how cooling occurs.

   For more information, look to the FAQ pages of companies like Baer Brakes and
Wilwood.

   But, if you really think you get better braking with smaller rotors, then one of
two things happened.  1.  Your brakes were so bad before that almost anything would
be an improvement.  Or, 2.  You've spent all that money on bad decisions, so you'll
stick by your guns no matter what, facts be damned.

Signature

.boB
Arrived:  2006 FXDI, Red.
1997 HD FXDWG - Turbocharged   Stolen 11/26/05 in Denver
    1HD1GEL10VY3200010    CO License J5822Z
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra -  427W EFI, Damn Fast.

dwight - 08 Sep 2006 03:22 GMT
>>>>>>I have aquestion about rotors and calipers on a 1990 GT.
>>>>>
[quoted text clipped - 44 lines]
> money on bad decisions, so you'll stick by your guns no matter what, facts
> be damned.

I don't argue with your logic. And, for all I know, the performance pads
made much more difference than the PowerSlots. I only know that I have never
had a problem with the PowerSlots in all the years that I've used them,
after having the stock rotors trashed two years into owning my '93. And I've
never again wondered if I'd be able to stop in time.

dwight
WindsorFox[SS] - 08 Sep 2006 04:46 GMT
>>>>>> I have aquestion about rotors and calipers on a 1990 GT.
>>>>>
[quoted text clipped - 45 lines]
> that money on bad decisions, so you'll stick by your guns no matter
> what, facts be damned.

    OMG I think you're full of sheepdip.

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

.boB - 09 Sep 2006 00:43 GMT
>     OMG I think you're full of sheepdip.

   That just means you havn't done your homework.

Signature

.boB
Arrived:  2006 FXDI, Red.
1997 HD FXDWG - Turbocharged   Stolen 11/26/05 in Denver
    1HD1GEL10VY3200010    CO License J5822Z
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra -  427W EFI, Damn Fast.

WindsorFox - 07 Sep 2006 16:24 GMT
>>>> I have aquestion about rotors and calipers on a 1990 GT.
>>>
[quoted text clipped - 7 lines]
>
>     Think how much better they would be with more surface area.

   None if they get wet.

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

WindsorFox - 07 Sep 2006 16:23 GMT
>>> I have aquestion about rotors and calipers on a 1990 GT.  I need to
>>> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 16 lines]
>
> dwight

    Not only that, slots and holes etc. are there to increase airflow
on the rotors and to remove water. Slutted rotors were seen on
motorcycles more before street cars because with everything exposed they
are more apt to get wet and the sluts allow the water to squish out so
you don't lose braking ability.

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

dwight - 08 Sep 2006 03:23 GMT
>>>> I have aquestion about rotors and calipers on a 1990 GT.  I need to
>>>> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 22 lines]
> to get wet and the sluts allow the water to squish out so you don't lose
> braking ability.

I sent a copy of your response to Dr. Freud. Waiting to hear back from
him...

dwight
WindsorFox[SS] - 08 Sep 2006 04:49 GMT
>>>>> I have aquestion about rotors and calipers on a 1990 GT.  I need to
>>>>> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 27 lines]
>
> dwight

   Let me know what he says by email, I don't know twats wrong lately
but I c.nt hear very well right now....

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

Michael Johnson, PE - 07 Sep 2006 02:13 GMT
Read through the following web site:  http://svo73mm.cjb.net/  It has
loads of good information regarding Fox brake upgrades.  I have done the
SN95 front brake conversion on my 89 LX and it made a big difference in
performance.  The Fox cars have terrible brakes.

> I have aquestion about rotors and calipers on a 1990 GT.  I need to
> replace my rotors and calipers and I have been told to go with
[quoted text clipped - 3 lines]
>
> Thanks Guys
WindsorFox - 07 Sep 2006 16:27 GMT
> Read through the following web site:  http://svo73mm.cjb.net/  It has
> loads of good information regarding Fox brake upgrades.  I have done the
> SN95 front brake conversion on my 89 LX and it made a big difference in
> performance.  The Fox cars have terrible brakes.

   I have some LTD calipers for mine, just havn't done the addition.
Pfff, I have too many projects to do...

Signature

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose

Michael Johnson, PE - 07 Sep 2006 19:02 GMT
>> Read through the following web site:  http://svo73mm.cjb.net/  It has
>> loads of good information regarding Fox brake upgrades.  I have done
[quoted text clipped - 3 lines]
>    I have some LTD calipers for mine, just havn't done the addition.
> Pfff, I have too many projects to do...

I don't think I would do the five lug conversion if I had it to do over
again.  The caliper upgrades are definitely worth it though.
 
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