Is My Brake Servo Faulty?

[Slo 283 1 Cars]

Had my brake pipes made up today so thought id give the master cylinder a good cleaing out before i started. It's new to the car but 2nd hand so I stripped it down before i fitted it a few months ago.

 

So I pressed the brake pedal today and it stopped down, well it gradually came back but very slowly so thinking the cylinder had crap in it removed it again and the pedal is still the same i can pull it back quickly , so its not air locking ot seized but it's got me stumped and im super pissed about it as it will be very hard to swap it this late into my conversion.

 

On inspecting the cylinder the plunger has also stopped lnside the cylinder however it isnt seized i can move it and have stripped it down again and all looked fine, put it back together again pressed plunger in and its sticking in so it lost and argument with the floor and lives in the green bin now.

 

Is my servo fubar'd? It was replaced with the cylinder at christmas. I've still got the original one but its extremely rusty and the pedal returns rapidly.

 

 

[Slo 283 1 Cars]

Just been laid in the car with my head under the dash and disconnected the brake pedal so i could pull the rubber out the way and given it a good squirt of wd40 then a lot of pressing and pulling the pedal back up and its free'd off thank god so now i need a new master cylinder

 

So can anyone recommend a good one for a good price? Im after a 1.9 item even though its a 1.6 setup i've got the blanking plug for the 4th hole.