DS_Porter 89 Burgandy Posted October 12, 2017 Share Posted October 12, 2017 AC Delco 25530882 pressure switch for Teves ABS systems My original ABS pressure switch has been sticking and causing both the red and amber warning lights to come on. Brake function is still good and the pressure pump cycles on and off normally as the pressure drops which leads me to believe that only the switch contacts that control the fault lights are sticking. I can reset the fault and stuck contacts by shutting the key off and pumping the brakes until all pressure is relieved and then restarting it and allowing about 25 to 30 seconds to re-pressurize the system. The pump contacts within the switch are independent of the fault contacts and therefore in my case I was able to carry on with no panic. Still it is a condition that needs a speedy fix. So most of you know that the original pressure switch is not available anywhere....at all. A couple years ago I purchased on Amazon an AC Delco 25530882 pressure switch because it appeared to be exactly the same as what I was looking at on my master cylinder. Of course when I went to change it I found that the connector pins were arranged differently. (Why did they do that??!!) I have done a local search for cars with the correct harness but I was quickly discouraged as most cars of that vintage have been sent to the crusher. So here is what I did... Small female spade connectors fit snugly on the new switch terminals but I needed to grind off one side as they were a bit too wide. On the original Reatta harness connector I found that 16 ga solid copper wire fits snugly into the harness wire sockets. I added a connector from an electronics shop for easy troubleshooting and disconnect. I verified the original wire colors assigned to the terminal letters according to the diagram on the FSM page 8A-202-22 After much checking and tracing and head scratching I have concluded that the switch diagram on page 5E1-74 of my FSM has terminals A and C reversed. The diagram should be as I have drawn below. New switch works fine connected this way and the correct harness connector was not needed. 3 Link to comment Share on other sites More sharing options...
Barney Eaton Posted October 13, 2017 Share Posted October 13, 2017 Good update on the pressure switch....is the 25530882 switch still available? Like you said, why would they change the connector. Link to comment Share on other sites More sharing options...
DAVES89 Posted October 13, 2017 Share Posted October 13, 2017 Good job on the repair, but too bad you didn't ask around here. I have two NOS switches as well as a number of good tested used ones. Regarding your situation of your switch sticking and causing the lights to stay on, I have a pressure switch that does not trip the "Red" light. I kept thinking it was the BCM but thought I would swap out the pressure switch first and that fixed my issue. Link to comment Share on other sites More sharing options...
2seater Posted October 13, 2017 Share Posted October 13, 2017 Some time ago there was a thread about using the switch that Ford used for the Teves system on the turbo coupes. I would believe it would have a Ford part number if it was the same one but the pinout looks similar to what I remember. Link to comment Share on other sites More sharing options...
89RedDarkGrey Posted October 13, 2017 Share Posted October 13, 2017 16 hours ago, Barney Eaton said: is the 25530882 switch still available? http://www.rockauto.com/en/parts/acdelco,25530882,brake+pressure+warning+switch,4268 https://www.amazon.com/ACDelco-25530882-Original-Equipment-Pressure/dp/B0010GFRD8/ref=sr_1_1?ie=UTF8&qid=1507921410&sr=8-1&keywords=acdelco+25530882 Link to comment Share on other sites More sharing options...
89RedDarkGrey Posted October 13, 2017 Share Posted October 13, 2017 Would these suffice as terminals? https://www.amazon.com/Baomain-Insulated-Connector-Electrical-Terminal/dp/B01962MW2G/ref=sr_1_1?ie=UTF8&qid=1507921714&sr=8-1&keywords=2.8+x+0.5mm+female+spade+connector I'm remembering KDirk was tinkering with this idea, a while ago... Link to comment Share on other sites More sharing options...
DAVES89 Posted October 13, 2017 Share Posted October 13, 2017 I sent a Ford connector to Machiner55 to try on the switch he bought [also a Ford] to cross over to our Buick units. It was never finished and Machiner55 has left the forum... Link to comment Share on other sites More sharing options...
DS_Porter 89 Burgandy Posted October 13, 2017 Author Share Posted October 13, 2017 Thanx for all your replies. Yes as you can see the ACDelco 25530882 switch is still available from RockAuto or Amazon. And yes those spade terminals look to be correct but I removed the insulation and ground off one side to make them narrow enough. To prevent the terminal connectors from moving or tilting I cut short pieces of cable tie plastic strips and filled all the gaps between terminals and then ty-wrapped the entire bundle. Never allow yourself to run out of ty-wraps. Silicone can be useful but this method can be reversed. Had I known that I was buying a different model switch I would have looked harder and queried this forum. You guys continue to be a wealth of info and parts. Thank you all. Anyone who comes across the correct harness connector for this switch should snip it and save it. In my area most all of the '86 thru '88 Olds Buick and Cadillacs have been destroyed. And my shoes got too dirty. Junkyards are not as much fun as they once were. Link to comment Share on other sites More sharing options...
89RedDarkGrey Posted October 14, 2017 Share Posted October 14, 2017 It would be nice- http://www.cardone.com/Products/Product-Detail?productId=123411&p=rock&jsn=1318 1 Link to comment Share on other sites More sharing options...
89RedDarkGrey Posted October 17, 2017 Share Posted October 17, 2017 You could plug in your wired connectors, then spray inside the socket with WD-40 or PAM cooking spray- then carefully pipe in a "harder" silicone, such as Ultra black or Ultra blue, or a "bathroom type" caulking, let it harden, then carefully pull it out, to make a plug. Link to comment Share on other sites More sharing options...
Gary Z Posted August 10, 2019 Share Posted August 10, 2019 On 10/12/2017 at 7:34 PM, DAVES89 said: Good job on the repair, but too bad you didn't ask around here. I have two NOS switches as well as a number of good tested used ones. Regarding your situation of your switch sticking and causing the lights to stay on, I have a pressure switch that does not trip the "Red" light. I kept thinking it was the BCM but thought I would swap out the pressure switch first and that fixed my issue. Howdy from Idaho! Do you still have those new pressure switches? I may be interested in one of them. Gary Z Link to comment Share on other sites More sharing options...
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