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How do I separate the brake Master cylinder from.

Tiny
SPIDERGEAR
  • MEMBER
  • 2007 FORD FOCUS
  • 100 MILES
How do I separate the brake master cylinder from the boost chamber? Brake pedal went right to floor, checked for line leakage & caliper & drum pistons & external master cylinder. No leaks! Added 500ml of fluid in total to brake reservoir & each time I tried the brakes the fluid would go somewhere but again no obvious leaks externally. Suspect brake master cylinder is leaking into the vacuum boost area. Disconnected the 4 brake lines & the reservoir line & the 2 mounting nuts from the master brake cylinder but can not remove the cylinder from the boost chamber? Is something else holding the cylinder onto the boost chamber?
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Tuesday, January 15th, 2013 AT 8:19 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,737 POSTS
Nope, just those two nuts. The two pieces are likely rusted together. Tap lightly on the master cylinder to free it. There's a metal cap on the end too that could catch on the edge of the hole in the booster. Wiggle the master cylinder sideways a little once it's cracked loose.
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Monday, March 15th, 2021 AT 7:16 PM

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