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2007 Gas gas 280 rear break issues

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Hi all , 

a little back story, was riding a trial and lost rear brake all together.

so I rebuild rear master cylinder , still know pressure 

bought new rear master cylinder and still no pressure 

rear piston won’t move with pedal pressed

so removed rear wheel and pushed pistons back , can not get pressure 

back bleeding pushes fluid all way from bleed nipple and flows free up to brake reservoir so no blockages

i am stumped , could it be rear caliber seals ?

Edited by kxrob
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