Serious leak somewhere, check underneath for fluids, blown wheel cylinder, check for wet/coated backplate and wheel, or master cylinder seals
 
upload_2023-2-25_18-58-10.png
 
Ok guys
the pedal is very sound, with no obvious leaks and I can't see any springs, or anywhere where a spring may be fitted.
It is a 1958 so a later one.
 
Ok guys
the pedal is very sound, with no obvious leaks and I can't see any springs, or anywhere where a spring may be fitted.
It is a 1958 so a later one.
Return Spring should be on the same bracket as the brake light switch spring.

some times the piston rod & piston seize a bit,check the dust cover is in place
 

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