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Upgraded to rear disc brakes ( from Blunt ) brakes will not bleed


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Upgraded to Rear discs bought from BluntTech. (I believe they are from a VW.?)  

Replaced master cylinder with a new one (Same type and size as original) .

However, the system does not pressurize enough and the pedal goes to the floor after bleeding as directed.

Removed the master cylinder and  blew out the lines to the rear , replaced master cylinder with the original, re-bled the brakes, and exactly the same thing happens.

It seems the front calipers will bleed well and I get a hint of pressure at the pedal when the fronts are being done, but absolutely no pressure generated when bleeding the rears.

My question is:  Do I need a larger master cylinder for use with the rear brake conversion?  OR what is going on and how can I address this.

Greatly appreciate any suggestions.


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