I removed this combination brake valve from a 1993 Ford Mustang that I found in a local wrecking yard. It's marked with an E7ZC-2B091-BA engineering number.
The brass body is marked with the word "SURF", a date code, and the engineering number. The date code on this valve is "202 3", which translates to day 202 of 1993, or July 21, 1993. I decided to disassemble it to see if it's rebuildable. Follow along as I tear it down! Tools needed:
Start by removing the small plug at the end of the valve using the 1/2" socket or box wrench. Remove the plug, spring, and piston. The piston can usually be extracted by tapping the open end of the valve firmly on your work bench. Remove the o-rings using your dental pick.
The spring found in these valves is resistant to corrosion and is reusable. The three o-ring seals will need to be included in a rebuild kit.
Now remove the large plug using the 3/4" socket or box wrench. Remove the seals, spring, and piston. Remove the o-rings using your dental pick. The piston can be removed with needle-nose pliers.
The spring found at this end of the valve is also resistant to corrosion and is reusable. The two o-ring seals and the piston seal will need to be included in a rebuild kit. Note that the smaller o-ring removed from this plug is just slightly smaller than the o-ring removed from the smaller plug.