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Lars(wi) 
Orange Level Access
Joined: 14 Sep 2009
Location: Permian Basin
Points: 8048
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 Topic: Anti lock
Posted: 26 Aug 2025 at 9:32pm |
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brakes on ‘91 Ford F-350, the RABS module to be more specific. What is the proper way to ‘test’ that module?
The rear sensor on the differential shows 1600(ish) ohms, from I been told, that is acceptable?
So far, have not found the cause of the ‘Rear Antilock’ light constantly being on. If it went for the cruise control unable to activate, due to this particular warning light, I wouldn’t worry, but no cruise cuts into the mpg.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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fjdrill
Silver Level Access
Joined: 13 May 2012
Location: Alabama
Points: 370
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Posted: Yesterday at 6:14am |
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Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24663
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Posted: Yesterday at 6:34am |
Are you saying you have 'no cruise control' ? If so ,was your truck recalled due to the 'master cylinder fire' problem and was 'fixed' by Ford ? If so, then the fuse in the 'repair' has blown as the switch in the master cylinder has shorted to ground . there is an EASY true fix to that problem that gives you back cruise control.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Lars(wi)
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8048
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Posted: Yesterday at 8:22am |
 fjdrill wrote:
Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work. |
Didn’t know that. I will have to check it out. This truck has a topper on it, with no 3 rd light.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Lars(wi)
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8048
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Posted: Yesterday at 8:41am |
jaybmiller wrote:
Are you saying you have 'no cruise control' ? If so ,was your truck recalled due to the 'master cylinder fire' problem and was 'fixed' by Ford ? If so, then the fuse in the 'repair' has blown as the switch in the master cylinder has shorted to ground . there is an EASY true fix to that problem that gives you back cruise control. |
Thanks Jay, don’t know if this vehicle went thru any recall repairs. It appears the Master Cylinder is not original, wheather it was replaced by Ford or not, I don’t know. The fuse in the fuse panel(position #17) is good. Is there another fuse in this particular system?
Edited by Lars(wi) - Yesterday at 9:00am
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Lars(wi)
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8048
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Posted: 23 hours 14 minutes ago at 11:07am |
Lars(wi) wrote:
fjdrill wrote:
Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work. |
Didn’t know that. I will have to check it out. This truck has a topper on it, with no 3 rd light. |
After further research, ‘91 F-350 was not equipped with the ‘3rd light’. That is the ‘cargo light’ that illuminates the bed.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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fjdrill
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Joined: 13 May 2012
Location: Alabama
Points: 370
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Posted: 20 hours 30 minutes ago at 1:51pm |
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Yep! my bad. was thinking 3 Brake light was 91. It came in 94. They have given me grief till I figured them out. Actually, a buddy told me about it, and I thought he was nuts!
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24663
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Posted: 20 hours 23 minutes ago at 1:58pm |
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My '97 was one of the ones with the 'flaming master cylinder' along with a long list of cars and other pickups. For that recall , Ford installed a small wiring 'harness' with an inline fuse. When that pops, no more cruise control ! Saves burning the truck toy the ground( neighbours did is 10 minutes ! . Ned to see the wiring diagram, but for mine there's a 24/7 connection to the battery feeding the master cylinder switch that then powers the cruise control 'computer'. Dang silly 'engineering' and NOT needed....
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33904
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Posted: 16 hours 39 minutes ago at 5:42pm |
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Speedometer MUST be Functional.
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 5097
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Posted: 14 hours 60 minutes ago at 7:21pm |
Ever since the first fiasco (121 standard) ABS brakes they have been a nightmare. Anything I've ever driven with some kind if ABS system, when in a pinch and your REALLY need to stop, the computer will say "brakes, you don't need no stinking brakes". I feel safer in my old vehicles that are pre ABS than anything new with anything ABS.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33904
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Posted: 9 hours 22 minutes ago at 12:59am |
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Been fighting with keeping these unsafe safety systems functional since inception in the 1970s on HD Trucks. All proved on Test Tracks until placed on the roadways and failed miserably. Trying to Safety fix all the bad drivers where all have done is made the average driver more complacent about Bad Habits.
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