My ABS light came on in my car. The pedal is soft as well and the brake light will occasionally come on during repeated brakes. I ordered the 3000psi tool off fleabay and will check the accumulator pressure, as you can still get the accumulator, but my guess is it's the hydro unit which is all in one.
The OEM P/N is 10112685 , which of course is NLA and not found anywhere.
Cardone used to have a rebuild one, for just over $1k, they still do for some other ones. It was 12-3409 for this car , but is NLA from them anymore. They have a couple other very similar units for the Reatta and a Caddy/Rivera/Toronado, 12-3411 and 12-3415.
The pedals got that same as any other blown master feel to it, I'm sure it's a $2 seal internally.

There is one company that claims to have a rebuilt one for this car. But I'm not sure about them. Invasion products. They have bad reviews as well, so I dunno. Plus I really don't want to spend that amount of $$$. http://www.invasionautoproducts.com/19po60steanl.html

They used these on a few vehicles, GM, Ford & Chrysler, the Ford Thunderbird from the era , their forums seem to have the most info on these units.

Anyone dealt with the Teves Mark II before? If cardone can rebuild it, I should be able to as well. Not sure though.

 This is the 12-3411 for Rivera/Toronado/Eldorado/Seville of late 80's early 90's. Mine looks the same, more or less.
   

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Well, since those of us who own these know those rear air struts become leaky when they get old and they are not really rebuildable or at least that's what they say, and since new ones 22064113, 22064114 are NLA from GM and I've had persistent searches in CL, Facebook Marketplace & fleabay, with nothing in years,  I was gonna try to find some similar ones and modify them.

I bought some 1991 LeSabre air struts. They appear to be the same extended and collapsed length and have the right fitting, and the upper mount is the same, the only thing missing is the lower mount with the toe tie-rod attachment wing on it. I'm gonna see if there's some way I can cut that off the old ones and weld it on to the new one, or make a bracket to get it bolted on. I dunno, welding on a sealed hydraulic cylinder is probably not a good idea. Small tacks may be possible. I'm not sure yet.

But I'll update when I get around to it!

 
   
   

Welcome to A-Body.org! This site is dedicated to those of us crazy people who are enthusiasts of or drive and maintain GM FWD/AWD A-body vehicles.

We used to have A-Body.net, but it suddenly disappeared.
Since I've not seen anything I went ahead and created this forum in hopes we can move our activities, as limited as they were, to here.

 I've no idea who owned the old a-body.net or controlled it, it would be nice if anyone knows that I can try to contact them and see if I can get the forum database and attempt to merge it in here.
Also, the a-body.net domain seems to have been taken over by some unknown entity and currently directs to some betting website, so, that is also not available.

But for now, enjoy!