Do recalls that affect safety ever expire?

[abilityonline]

All,

I've got a 68 C50 Dump truck. The Master B/C is loosing fluid out the top when pressure builds on a long/hard brake.

Doing some searching I found
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Recall Number: 69V039000
Build Years/Makes/Models: 1967 - 1968 CHEVROLET C60
1967 - 1968 CHEVROLET C50
1967 - 1968 CHEVROLET C40
1967 - 1968 CHEVROLET S60
1967 - 1968 CHEVROLET S40
1967 - 1968 CHEVROLET S50
1967 - 1969 GMC E4500
1967 - 1969 GMC E5500
1967 - 1969 GMC S5500
1967 - 1969 GMC S6500
1967 - 1969 GMC E6500

UNits affected: 163493

Recall Number: 69V039000

Summary:

Consequence:

Remedy:

Notes: POSSIBILITY THAT SEAL ON PISTON IN MASTER BRAKE CYLINDER MAY, AFTER EXTENDEDUSAGE, ALLOW BRAKE FLUID TO PASS SEAL PERMITTING BRAKE PEDAL TO BE PUSHED TOFLOOR IN A SLOW GRADUAL STOP OR UPON THE FIRST AP- PLICATION OF BRAKES AFTERVEHICLE HAS BEEN STANDING FOR A PERIOD OF TIME.IS ALSO A POSSIBILITY THATINNER LINER OF VACUUM HOSE WHICH CONNECTS TO BRAKE VACUUM BOOSTER MAY COLLAPSE,CAUSING LOSS OF POWER BRAKE ASSIST.(CORRECT BY INSTALLING NEW PARTS IN BRAKEMASTER CYLINDER AND MODIFYING VACUUM HOSE ROUT- ING.)

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Would GM still stand by this recall? I know the best answer is to call but curious if anyone has been in a similar situation