[AT] ag tractor braking retrofits

[Cecil Bearden]

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...
Cecil

On 12/30/2019 1:13 PM, Stephen Offiler wrote:
> 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 
> <mailto: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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