That looks the same as mine, which came from a sierra donor that flyerncle & i stripped.
As Spud has mentioned on Ash,s brake thread, he found the seal (closest to the pedal box) between the resevoir & the M/C was weeping, very very slightly, swapped it for the one from my donor solved the problem.
I believe you can get a seal kit to replace all the seals , tho a new M/C can be bought for about £30 if speed is the essence.
cheers
andy
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