no abs warning light prove-out
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no abs warning light prove-out
Hello,
I hope someone can steer me in the right direction. I'm having issues with the rabs on my 93 super duty diesel with dual rear wheels. First my driver side rear caliper locked up, so I replaced & it happened again only to smoke & leak brake fluid in front of a customers house. So I have started at square 1 trying to track down why the abs warning light doesn't come on for 2 sec at start up, then do a diagnosis on the system. All fuses are ok, all dash lights have been replaced, when I applied test light to back of instrument panel at abs warning light it came on. I was thinking it may be the module. I have called dealer, they said there is no rabs module on my vin# & my Chiltons manual has everything but super duty.
I guess my questions would be is:
1 - is this the right way to go about it?
2-so would there be a short in the ground?
3- any one know where to find wire schematics, I purchased some online said f-series for 26 bucks,but again it has abs module wired in & my truck isn't supposed to have one.
I'm totally stuck on this, I have spent around 3 days, $480 on parts & a mechanic & still my truck is the same.
Desperate for any help thanks
I hope someone can steer me in the right direction. I'm having issues with the rabs on my 93 super duty diesel with dual rear wheels. First my driver side rear caliper locked up, so I replaced & it happened again only to smoke & leak brake fluid in front of a customers house. So I have started at square 1 trying to track down why the abs warning light doesn't come on for 2 sec at start up, then do a diagnosis on the system. All fuses are ok, all dash lights have been replaced, when I applied test light to back of instrument panel at abs warning light it came on. I was thinking it may be the module. I have called dealer, they said there is no rabs module on my vin# & my Chiltons manual has everything but super duty.
I guess my questions would be is:
1 - is this the right way to go about it?
2-so would there be a short in the ground?
3- any one know where to find wire schematics, I purchased some online said f-series for 26 bucks,but again it has abs module wired in & my truck isn't supposed to have one.
I'm totally stuck on this, I have spent around 3 days, $480 on parts & a mechanic & still my truck is the same.
Desperate for any help thanks
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ABS Hydraulic Unit | 1990 Ford F250 3/4 ton P/U 2WD 8 Cylinders H 5.8L FI Windsor | AutoZone.com Click on this link to see what the RABS hydraulic module looks like. If you have RABS you should find something like it bolted to the inside of the left side frame rail about level with the drivers feet.
Even if you have RABS it is unlikely that a fault in it would cause one rear caliper to drag.
The F450 may not have RABS at all, not sure.
Even if you have RABS it is unlikely that a fault in it would cause one rear caliper to drag.
The F450 may not have RABS at all, not sure.
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No, the 93 450 has RABSII & only has a height proportioning valve,which has a mechanical lever that activate anti lock brakes under load.Its not supposed to go bad & no one makes them because of that reason. If for some reason that lever is removed, it loses its factory setting & is worthless, per Chiltons. I have looked everywhere on my truck for a module, there isn't one I could find.
I'm to the point of just by-passing The RABS system altogether, just hesitant because of mixed reviews. Any thoughts?
I am going to change my rubber break lines going to calipers & trying to flush all old fluid out. Maybe then pull abs fuse? not even sure that i need to do that since the light wont prove-out.
I'm to the point of just by-passing The RABS system altogether, just hesitant because of mixed reviews. Any thoughts?
I am going to change my rubber break lines going to calipers & trying to flush all old fluid out. Maybe then pull abs fuse? not even sure that i need to do that since the light wont prove-out.
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If it doesn`t have that RABS HC module then it goesn`t have RABS, The valve you mention is a load sensing valve and has nothing to do with RABS.
If you have individual rubber flexible hoses going to each rear brake then an internally collapsed hose would be a prime suspect.
If you have individual rubber flexible hoses going to each rear brake then an internally collapsed hose would be a prime suspect.
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i have the rab;s module on my 87 f-150 4x4. the abs light stays in all the time. it says rear abs. iput that unit on about a year and a 1/2 ago. i bled the front brakes and the rear brakes, but i didnt bleed the abs unit its self. i didnt know rhere was a bleeder valve on it till a couple days ago. if i bleed them again plus the unit, wonder if my light will go off?? thanks
bill
bill
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Maybe will. Also you could take the RABS sensor out of the top of the rear axle diff housing and clean any crud off of it.
If the light is still on after that, you may need to get the trouble code to pinpoint the fault.
However the light just means that a fault has neen detected and the RABS has been disabled, no big deal as it is not much use anyway. A lot of guys just put a piece of tape over the light and forget about it.
If the light is still on after that, you may need to get the trouble code to pinpoint the fault.
However the light just means that a fault has neen detected and the RABS has been disabled, no big deal as it is not much use anyway. A lot of guys just put a piece of tape over the light and forget about it.
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This really sucks!! I am about to drive this off a cliff,help the economy & buy,a new 450, problem is I'm broke!!! I failed to mention that I had called the dealer, they are the ones that said I don't have a module. Through my research the 93 450 (not sure about 550& up) didn't have a module but The 150,250 350 did. The wheel sensors are the only parts available at dealer & the neighboring parts stores.
I couldn't find any electrical schematics for the 93 super duty either. In the repair books have everything but.
Right now I'm looking for the rubber hoses that lead to calipers, but no one has them that is open on Sun. I hope the dealer has em. Then,I work on bypassing this inferior Kelsey & Hayes RabsII system that was installed on.
A good site for troubleshooting, thought I would pass on, It has most all abs systems that are av available on cars.
Kelsey-Hayes RWAL Antilock Brakes
Thanks peoples!
I couldn't find any electrical schematics for the 93 super duty either. In the repair books have everything but.
Right now I'm looking for the rubber hoses that lead to calipers, but no one has them that is open on Sun. I hope the dealer has em. Then,I work on bypassing this inferior Kelsey & Hayes RabsII system that was installed on.
A good site for troubleshooting, thought I would pass on, It has most all abs systems that are av available on cars.
Kelsey-Hayes RWAL Antilock Brakes
Thanks peoples!
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well,I called every parts store that is open, no brake lines available, whats new!!! Hope the dealer has some on Monday or I'm screwed. I have seen them online but that means, at least 4 days down. I guess i will have to enjoy the 49er's get beat!!!
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Always something. Try rockauto.com for them, they ship very fast (if dealer doesn`t have them).
You are confusing me a bit with the mention of wheel sensors. The F150, 250 and 350 all have one sensor on the top of the rear diff housing (also used as the vehicle speed sensor or VSS).
You are confusing me a bit with the mention of wheel sensors. The F150, 250 and 350 all have one sensor on the top of the rear diff housing (also used as the vehicle speed sensor or VSS).
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Phy, that sounds just like my 93. From what I read it has RABS2 & you should have a abs.light that kicks on for 2 sec at start up, right? Isn't that abs? I'm no mechanic. Fords wiring diagrams must be wrong for 93, something is fishy with them. I started troubleshooting this all because my abs light would not prove-out & wanted to make sure the brake system was in top working condition. When I went to trace the wires to figure why, I couldn't find the module like the wire diagrams were showing. The dealer said there was no module, the chiltons also has flash codes for diagnosis & I have found the pigtail for diagnoses per Ford wiring,which under hood just to the right of master cylinder hanging on a clip. Why the hell do they have a abs light if its not even needed? I'm going to install my new rubber brake lines & pull my fuses that go to abs, unless someone has a better idea.
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Ford started fitting RABS to the F series trucks in 1987 and at the same time dropped the load sensing valve, as with RABS it was no longer needed. So as you have a load sensing valve it would be a good bet that you do not have RABS. Ford probably just dropped in the same instrument cluster across the range, hence you have the ABS warning light but it doesn`t work.
The diagnostic connector you found may be for the transmission (if E4OD trans).
The diagnostic connector you found may be for the transmission (if E4OD trans).
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Lazy K, THANK YOU!!!
I was just getting ready to ask that question. The warning light was never supposed to work, that's hilarious, I have to laugh after that. I have been scratch my head on this one for days, so basically same cluster that was used in other models the just never hooked up the warning light. I wonder why fuse #15 is dedicated for abs system & has power? well if its not broken you can't fix it,so i'm not going to worry bout it.
Dude, Rockauto. com is the bomb, sent order in yesterday morn. 3 day priority mail, they sent tracking # to me, its already with fed-ex right up the road, should show up today! The dealer said they might be able to get hoses next day but wasn't sure. Thanks for saving me $120 plus delivery to door!
I was just getting ready to ask that question. The warning light was never supposed to work, that's hilarious, I have to laugh after that. I have been scratch my head on this one for days, so basically same cluster that was used in other models the just never hooked up the warning light. I wonder why fuse #15 is dedicated for abs system & has power? well if its not broken you can't fix it,so i'm not going to worry bout it.
Dude, Rockauto. com is the bomb, sent order in yesterday morn. 3 day priority mail, they sent tracking # to me, its already with fed-ex right up the road, should show up today! The dealer said they might be able to get hoses next day but wasn't sure. Thanks for saving me $120 plus delivery to door!