Master cylinder

[yellowdog]

Morning all , another cold wet day in the UK .
Today's query pls ,does the very small hole in a 72 master cylinder go all the way through and into the bore?
Mine doesn't ,it is either very blocked or is blanked off .This brake is proving a bit of a pain !
Thanks.

 

[DogBunny]

Yes, that hole should go all the way through. You can poke the hole with a single strand from a stranded electrical wire.
You need to make sure the piston retracts all the way in the bore.

 

[yellowdog]

Yes, that hole should go all the way through. You can poke the hole with a single strand from a stranded electrical wire.
You need to make sure the piston retracts all the way in the bore.

Thank you I was pretty sure it went all the way but it is pretty bunged up .