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Model A Brake Master Cylinder Unit - Help needed
- 61xlch
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I have an Owners Service Manual copy, but all copied drawings in this manual are too small and too bad quality, in order to see small details.
Any lead appriciated.
Thanks
Andreas
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- RandyEma
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- mikespeed35
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Mike Huffman
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- 61xlch
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When I have a good pressure point at the pedal after numerous strokes, it feels quite hard and holds this pressure very good and the needed stroke is VERY short. It doenst feel springy or soft at all, like it would be with air in it.
Only after a longer time (some hours or days) it looses this pressure point completely.
What is also unusual: even after I let the pedal back off and don´t touch it anymore, there continues a pretty strong and constant stream of fluid out of any bleeder screw, when I open it again.
No idea, what could be wrong. Possibly something is installed in a wrong way...
This brake issue stops all progress with my car. I am close to put it away again for the next 3 years...
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- mikespeed35
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- Joel
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When bleeding DOT 5 you need to do everything very, very slow, or you will stir up air that gets into the fluid. If you are using a pressure bleeder, use very low pressure in it, if you are bleeding by pumping the pedal go very slowly. About 10 seconds at a steady pace to get from a fully released peddle to the floor. Then close the bleeder screw and take another 10 seconds to slowly raise the pedal. After you are done bleeding, just let it sit for a day or two for the tiny bubbles to gather together into big bubbles and bleed it again, very slowly. Repeat as needed.
Good luck.
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- adamarehart
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- RandyEma
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- 61xlch
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Its been reamed and honed and fitted with a new oversize piston and new made rubbers. After achieving a considerable pressure it holds the pressure and does not fall through.
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- mikespeed35
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- 61xlch
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Regarding your hints: I used DOT5 silicone fluid, all hoses are new, no leakage outside. I am pretty sure it's bleeded 100%.
Must be a problem inside the master cylinder.
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- hessacres
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- 61xlch
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I rebuilt it carefully and complete, but it doesnt operate as needed.
Even after numerous bleeding procedures and double checks I am not able to achieve a constant pressure at the pedal. With countless pedal moves down to the floor it builds up a pressure, but after sitting half an hour it needs to be pumped up again.
Any ideas and experiences appreciated.
Thanks
Andreas
Berlin/ Germany
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