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Author Topic: No pressure after MC rebuilt  (Read 2174 times)
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lukasdeopalenica
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« on: December 03, 2012, 12:02:25 PM »

Hi Guys,
After rebuilt of my brake system (new hoses, new seals at calipers and master cylinder) my brakes literally do not work at all. I tried to bleed the system, but it seems that the pump can not built the pressure and does not suck the fluid from the reservoir. Eventually I filled the hoses and calipers gravitically, just opened subsequently bleeding screws and waited for the fluid to come, and came at all points. Should the MC be bled additionally? I am almost sure, but not sure of course I have reassembled the MC correctly... I would be grateful for any tips Smiley
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
lukasdeopalenica
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« Reply #1 on: December 04, 2012, 10:38:22 PM »

No one knows?  Undecided

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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
MattNoVAT
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« Reply #2 on: December 05, 2012, 09:20:51 AM »

As you have filled the system with fluid then I would start by checking the master cylinder first to ensure that it has been rebuilt correctly.
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thecolonel
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« Reply #3 on: December 05, 2012, 11:18:33 AM »

Dry rebuilds can cause the seals to flip over
the first time the pedal is pressed.
Pain in the butt, but does happen I'm afraid.
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lukasdeopalenica
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« Reply #4 on: December 05, 2012, 03:56:32 PM »

It sounds like that. Thank you. So I will disassemble the mc once again...I hope the seals are still in working condition Wink
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Lancia Beta HPE 2000i.e. '82 rosso corsa
SAAB 900i 16V Aero, '93 solid black
Subaru Outback 3.0R
Honda CB125 K6 '76 electric blue
Specialized Epic & Stumpjumper
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