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Big Nut Master Cyl repair kit faults - primary piston seal covers compensating port
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68GTSmonaro Offline
#1 Posted : Wednesday, 17 December 2025 9:56:27 AM(UTC)
68GTSmonaro

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Hi

Having rear brake issue after rebuilding a big nut HK Disc/drum master cylinder-- I'm suspecting the generic off ebay seal repair kit may have the wrong type size seal on the primary piston and is partially blocking the compensating port in the reservoir.

have others had this issue ?

thanks
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holden05 Offline
#2 Posted : Thursday, 18 December 2025 8:25:18 AM(UTC)
holden05

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What symptoms is it showing ?
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68GTSmonaro Offline
#3 Posted : Thursday, 18 December 2025 3:37:20 PM(UTC)
68GTSmonaro

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no rear brakes - only have brakes under booster application
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