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Unread 09-23-2013   #1 (permalink)
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Default 70 mustang soft brake pedal

Have a 70 Mach. Pwr disc frt, drum rear. Soft brake pedal. Bleed system. Then changed master cyl.(bench bleed), bleed system-still soft. Changed vac power booster, and bleed-still soft. Changed proportional valve, bleed with 25# system bleeder-still soft. Fluid comes out when bleeding no air. Lines are not kinked. When pedal held-all four wheels will not turn. No fluid leaks. Adjusted/readjusted rear drums. Have done many brakes systems. Never experienced this issue.
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Unread 09-23-2013   #2 (permalink)
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are the rubber lines old? if they are they could be ballooning when you hit the pedal.
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Unread 09-23-2013   #3 (permalink)
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Are you using a pressurized bleeder (one of the old bladder styles) attached to the top of the master cylinder or vacuum bleeder at the bleeder valve.....just wonder if some how the fluid is getting aerated as it's introduced to system during the bleeding process??
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Unread 09-23-2013   #4 (permalink)
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Default 70 Mustang soft brake pedal

Thanks for quick response. Will check brake lines for ballooning. as for the second response - the pressure bleeder attaches to the top of Mater Cyl. It is a new one with a large reservoir to prevent adding new air. When bleeding- we have experienced smooth flow of brake fluid. We have bleed with and without the bleeding system. Use the old 2 man system.
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Unread 09-24-2013   #5 (permalink)
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Good suggestion by pockets.....the braided rubber hoses, even when new expand under extreme braking. If they are old and getting spongy it's even worse....when you get to that point replace them with good quality stainless steel braided lines.........
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