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92 gmc vandura brake warning light cause


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dalesvandura
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Jun 13, 2010, 12:08 AM

Post #1 of 21 (2610 views)
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  post locked   post icon 92 gmc vandura brake warning light cause  

i have a 92 gmc vandura 2500 with the 5.7 and i have a brake warning light that wont go off on the dash i have checked my fluid levels they are fine i recently replaced my rotors pads and calipers bled them and the rear lines just make sure my mechanic didnt screw up i also have all new lines except for the ones from my master cylinder to the proportioning valve i would love any help i can get im willing to try just about any thing also i got a new battery had the people at the parts store install it and they knocked off and managed to unplug a black box that was mounted to upper section of the corner panel near the bulkhead


nickwarner
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Jun 13, 2010, 2:45 AM

Post #2 of 21 (2606 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

two things come to mind, each as likely as the other. Either your master cylinder has a plastic reservoir and a plug in for a low fluid level sensor which is bad, or your e-brake pedal is slightly applied. Pull the e-brake release with one hand while pulling up one the pedal with the other and see if the light goes off. If so, you have found the gremlin. Otherwise, unplug the electrical connector at the master and see if the light goes off. If so, and the level of fluid in the master is within spec, its the sensor you unplugged at fault. This is assuming that all 4 brakes are functioning as they should of course.


dalesvandura
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Jun 13, 2010, 4:16 AM

Post #3 of 21 (2603 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

park break is fine that was the first thing i checked seeing as how i do occasionally use it and no there is no plug on the master cylinder or on the plastic tanks there is one on the proportioning valve that does not change the status of light whether it is plugged in or not it also feels like only my front brakes are working despite all the rear brake componets checking out ok no leaks in the wheel cylinders and no unacceptable wear on the shoes and drums though when i bled the rears brakes i did not get the usual blast of brake fluid it was much more of a trickle


(This post was edited by dalesvandura on Jun 13, 2010, 4:38 AM)


Hammer Time
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Jun 13, 2010, 7:49 AM

Post #4 of 21 (2597 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

Take a large screwdriver and rap the side of the master cylinder reservoir with the handle a few times and see if the light goes off. It's very common for the float to stick at the bottom of the reservoir when it went dry during the repair and the flotation isn't enough to dislodge it from the gunk.




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(This post was edited by Hammer Time on Jun 13, 2010, 7:50 AM)


dalesvandura
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Jun 13, 2010, 11:17 AM

Post #5 of 21 (2589 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

there is no float and it was just fine for a while other than not having rear brakes the lines from the master were plugged and the resovoir didnt go empty any idea what the little black box i described is that got disconnected and then put back in same time and thats about when this problem started but it also makes it feel like i now have rear brakes


Hammer Time
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Jun 13, 2010, 11:52 AM

Post #6 of 21 (2585 views)
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dalesvandura
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Jun 13, 2010, 4:17 PM

Post #7 of 21 (2576 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

hey this is pretty helpful except that one i dont have antilock breaks 2 i already tried the park brake check and disconnect of the switch and 3 the locations of the components to check are not listed like that in a haynes manual and i cant afford all data at the moment if you could post the diagram with the locations and numbers it would be a big help but other than that is there anything else that could cause this kind of a problem


Hammer Time
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Jun 13, 2010, 4:20 PM

Post #8 of 21 (2574 views)
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I have given you the factory diagnostic procedure for your problem. If you can't figure it out from that, head to the shop.




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dalesvandura
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Jun 13, 2010, 4:29 PM

Post #9 of 21 (2568 views)
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see heres why i am doing it myself the dealer said they wont touch it my mechanic cant figure it out and im hoping some one else can give me some other thoughts on the matter and maybe think of something that got missed


Hammer Time
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Jun 13, 2010, 4:32 PM

Post #10 of 21 (2565 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

I have given you a procedure that systematically eliminates all possible causes. If your unable to follow them, then you need to let someone else do it.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dalesvandura
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Jun 13, 2010, 5:38 PM

Post #11 of 21 (2559 views)
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so your telling me im an idiot thanks i went to matc for diesel powertain servicing and have had to do ellectrical on damn near everthing fom cars and trucks to boats small planes hobby stuff even appliances and have not once failed i know what im doing but the information you have given me was not accurate i have no sensors in the back of the van any where around the brake system the only thing plugged in is the single wire plug on the proportioning valve which is mounted on the drivers side front frame rail and the park brake switch thats it if you want pictures il send them


Hammer Time
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Jun 13, 2010, 5:41 PM

Post #12 of 21 (2554 views)
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So, did you unplug both of those switches as the test instructed?




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dalesvandura
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Jun 13, 2010, 5:58 PM

Post #13 of 21 (2548 views)
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c 163 so long as thats the single plug on the propotioning valve then yes i unplugged both as the diagnostic flow chart instructed and still nothing the light remained on hence my frustration its the only vehicle i have and i cant afford to take it back to the shop for a third time i know its a long shot to ask but no one has answered me about the little black box that is mounted above the battery that had been disconnected could that maybe have something to do with it something like a secondary computer for the braking system that got screwed up and would some pictures help so you can see what im seeing and talking about


dalesvandura
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Jun 13, 2010, 6:04 PM

Post #14 of 21 (2544 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

so i unplugged said mysterious black box and the brake warning light went off and my brakes still function any ideas cause now im really confused


Hammer Time
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Jun 13, 2010, 6:04 PM

Post #15 of 21 (2543 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

Are you talking about a flat module mounted vertically?




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Hammer Time
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Jun 13, 2010, 6:10 PM

Post #16 of 21 (2539 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

That is the ABS module you said your truck didn't have. Your truck has rear wheel only ABS and it's storing a code. That's why your light is on.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dalesvandura
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Jun 13, 2010, 6:16 PM

Post #17 of 21 (2533 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

not mounted vertical horizontal and its about 4 in wide 7 in long and about 3/4 in thick and if this is the problem how would i go about retrieving said code and or deleting it all toghether and how does rear wheel only abs work cause im used to seeing the big ugly block that controls the pressure and pulses it but where is that on my van i have now should i use flash diagnostics or pull out my obd 1 scanner


Hammer Time
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Jun 13, 2010, 6:26 PM

Post #18 of 21 (2531 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

Trouble codes can be accessed by connecting a TECH 1 scan tool or by manually grounding the ALDL connector. To manually ground the ALDL connector, connect a jumper wire between terminals A and H and observe the flashes of the brake warning lamp. Note the following when performing the Diagnostic Circuit Check to access trouble codes.
  1. When the terminals are jumped, count the number of short flashes starting from the initial long flash and including the long flash in the count.
  2. The count sequence will repeat as long as the ALDL connector terminals are jumped with the ignition on.
  3. Sometimes the first count sequence will be short. However, subsequent counts will be accurate.
  4. If more than one failure has occurred, only the first recognized failure code will be stored and flashed by the ECU.
  5. After determining the stored failure code, perform steps indicated by the diagnostic circuit check and follow the indicated failure code chart. After performing all indicated repairs, road test vehicle to check system operation, then recheck system for stored trouble codes.
This picture is for a Blazer but it shows the module










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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hammer Time
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Jun 13, 2010, 6:35 PM

Post #19 of 21 (2528 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

These codes are for a 93 but they should be the same. It's the same system







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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



cmvdvg
New User

Sep 15, 2013, 4:10 PM

Post #20 of 21 (1018 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

My 91 vandura has same light on but it does go off after a while I'm thinking there is a burr on emergency brake cable inside drum and its sticking. Its self adjusting rear brakes so the self adjusting mechanism (it looks like a star or a spur from a boot) is sticking or cable itself but let me know if u fix it and what the problem is


Tom Greenleaf
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Sep 15, 2013, 4:23 PM

Post #21 of 21 (1015 views)
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  post locked   Re: 92 gmc vandura brake warning light cause [In reply to]  

Please start you own thread with your own specifics. This one is now old and done. Locked now to keep it from this...........

T
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