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<p>My 97 Expedition has 4 wheel disc brakes it is basically the same
thing as an F-150. The parking brake is a problem as it is a
small drum brake inside the rotor. The springs get weak and let
the shoes drag and when they get hot then they really drag... One
got hot enough to soften up the plastic wheel cover...<br>
Cecil<br>
</p>
<div class="moz-cite-prefix">On 12/30/2019 1:13 PM, Stephen Offiler
wrote:<br>
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<div dir="ltr">Sounds about right Phil. I had a '96 F-250
(old-style, pre Super Duty) with rear drums. Around the late
90's or early 2000's as you mentioned I started seeing rear
discs on pickups. The Google will tell you about the pro's and
con's of drums vs discs in mostly layman's terms, but one thing
I don't see mentioned are the design parameters of ABS, traction
control, and stability control. Of course you can have ABS on a
drum-brake system; many exist. But discs have advantages:
better heat dissipation and more linear response (brake force
vs. line pressure). I am guessing you can probably cycle ABS
faster on discs, as drums have a self-energizing effect on the
leading shoe and it probably takes longer to pull the shoe out
of contact. Traction control and stability control systems take
various forms, and some will automatically "tap" the brake on a
spinning wheel. Do that often enough and heat dissipation is
going to be a primary concern.
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<div>SO</div>
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<div dir="ltr" class="gmail_attr">On Mon, Dec 30, 2019 at 12:57
PM Phil Auten <<a href="mailto:pga2@basicisp.net"
moz-do-not-send="true">pga2@basicisp.net</a>> wrote:<br>
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<p>James,</p>
<p>I drive a 2009 F150 and it has 4 wheel disc brakes. I
believe those became standard sometime in the late 90's or
early 2000's.</p>
<p>Phil in TX</p>
<br>
<div>On 12/30/2019 7:18 AM, James Peck wrote:<br>
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<p class="MsoNormal">I was not aware a standard exists
requiring semi tractors to stop from 60 MPH in 250
feet and that some fleets are pushing to stop in 225
feet. In the case of European ag tractors that haul
trailers on the highway at higher speeds I am guessing
that all wheel braking will be the new norm.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><a
href="https://www.ccjdigital.com/air-disc-brakes-likely-to-become-most-popular-option-but-drums-will-not-go-away/"
target="_blank" moz-do-not-send="true">https://www.ccjdigital.com/air-disc-brakes-likely-to-become-most-popular-option-but-drums-will-not-go-away/</a></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I see rear disc brake conversion
kits for collector automobiles like Jeep Cherokees and
Ford Mustangs. I was looking at new F150s recently.
Even the optionless F150 models having manual door
locks and vinyl seat covers have rear disk brakes.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The Shelby Ford win at LeMans
involved building an entire
spindle-hub-rotor-caliper-pad-cylinder assembly that
could be changed out in a short time. I do not know
how they handled the brake bleeding issue unless they
used quick disconnect fittings on the brake lines.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">As a kid, I used to go to Burton
Ohio and ride on a traction engine pulled wagon. The
ride was not totally silent. Sone years ago a traction
engine boiler exploded at the Medina County fair, a
couple of counties west of there. That event has had a
lot of repercussions for the showing of traction
engines.</p>
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