I got replacement rear wheel cylinders in today from RockAuto. There was brake fluid inside the rubber cups of the passenger side rear, so I think I found why the brake lines were empty. I need to wait on seals and repair sleeves which are coming in from Ebay, so their delivery time is dependent on the good ol' USPS. I'm probably going to have to spend the next couple of weekends preparing the parts for reassembly anyway, so no worries there smile

Since I asked about wheel cylinder part numbers earlier, I'll confirm what I used here for anyone else in the future with a 9600 who might read this thread:
The numbers were found on this thread

Front Left (Driver side): Raybestos WC19091
Front Right (Passenger side): Raybestos WC19090
Front Rubber brake hose: Raybestos BH36548 (Two are needed)

Rear wheel duo servo cylinders: Raybestos WC18197 and WC18196 (One of each is needed for each wheel)
Rear rubber brake hose: BH25664 (If your brakelines jump from the frame and tee off with steel lines like mine, you only need one)

The rear hub seals are SKF part number 36340 (4 7/8" OD x 3 5/8" ID x 3/4" T). I am using a SKF 99363 repair sleeve to cover the pitting on the bearing hub.

Last edited by Puffie40; 06/07/2024 4:27 AM.

1959 Canadian GMC 9600 with a dump box
Intro / Details in Big Bolts