[AT] ag tractor braking retrofits

[Stephen Offiler]

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.

SO

On Mon, Dec 30, 2019 at 12:57 PM Phil Auten <pga2 at basicisp.net> wrote:

> James,
>
> 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.
>
> Phil in TX
>
> On 12/30/2019 7:18 AM, James Peck wrote:
>
> 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.
>
>
>
>
> https://www.ccjdigital.com/air-disc-brakes-likely-to-become-most-popular-option-but-drums-will-not-go-away/
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> 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.
>
>
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