Coast Brake 4R100 - Ford Powerstroke Diesel Forum

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post #1 of 17 Old 10-01-2010, 11:02 AM Thread Starter
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Coast Brake 4R100

How can I turn off the coast brake on my 4R100 trans. Would like to be able to turn it off/on when ever I want. The harness diagram shows a red wire that controls the solenoid and I was wondering has anybody installed a switch on that wire and if I did would it throw a code or affect the trans.

1999 f350 4R100

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post #2 of 17 Old 10-01-2010, 11:04 AM
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Coast brake?

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post #3 of 17 Old 10-01-2010, 11:05 AM
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are you talkin about when you let off the gas when in od and it winds down before it unlocks? and injectors are off/ not firing?

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post #4 of 17 Old 10-01-2010, 11:33 AM Thread Starter
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Coast Brake

Yes I would like to turn it off so the truck would drive better and save fuel Any help!!!

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post #5 of 17 Old 10-01-2010, 12:11 PM
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generally the injectors are already off. its the transmission thats spinning the engine when the tq is locked.

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post #6 of 17 Old 10-01-2010, 12:37 PM
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A locked converter gives better MPG's

No reason to want to unlock it while cruising

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post #7 of 17 Old 10-01-2010, 12:56 PM Thread Starter
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I think we are talking about two different things. I'm talking about the coast brake not the locking torqe converter Two different things. When you are going about 55 and let off the gas the truck will slow down rapidly. I looked up the info for that trans (4r100) and it has a coast brake that is doing it. It is solenoid controled and the wiring diagram says it is a red wire and if i put a switch in it will it mess up the trans or throw a code I want to turn it off/on when I want to

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post #8 of 17 Old 10-01-2010, 01:38 PM Thread Starter
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I'm sorry but it's called a coast clutch and it is controled by the CCS. I am trying to get the trans to freewheel when I let off the gas/diesel

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post #9 of 17 Old 10-01-2010, 01:47 PM
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I just put mine in neutural, say when I am going down a hill and dont want to slow down.

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post #10 of 17 Old 10-01-2010, 01:52 PM
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Quote:
Originally Posted by Fishhook240 View Post
I'm sorry but it's called a coast clutch and it is controled by the CCS. I am trying to get the trans to freewheel when I let off the gas/diesel
It slows rapidly because your converter is locked at that speed. It will unlock if you let out of the pedal and it gets below 45 mph.


Get a custom chip with an econo tune. Thats the only way to achieve what you want

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2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
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