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If what peashooter said is correct and the reservoir won't cross over then the standard remote top plate wouldn't work either.

Good to know. Thanks for jumping in.

More information that may or may not be helpful. If you search Rock Auto for the Dorman M39477 (out of stock) it also brings up the Raybestos MC39477. These are on clearance for $53.84 plus shipping but would require you to swap your reservoir over to the new master cylinder assembly. The one...

I have the following alternate rebuild kits in my notes but I haven't been able to confirm that they are correct. All of these kits include the springs and pistons. Pretty complete kits if you can find them. Again, confirm before searching. Alternate/OEM Part Number(s): GM 15513991 GM...

Going from memory I believe the rebuild kit for our dual circuit trucks is the Raybestos MK1624. Hopefully someone will jump in here and verify that. @peashooter is one of our resident brake experts. Edited to correct the member reference.

Could be as simple as a bad seal in the master but there are guys here that are light years ahead of me on troubleshooting the split brake system.

Do you have pictures of the underside of the truck? I don't see an '88 with all the signs of it being an AF truck with split brakes and a plastic reservoir not having the second air pack unless things have been drastically altered.