1965 No Brakes, no leaks | Ford Thunderbird club group 1955-2005 T-Bird models

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1965 No Brakes, no leaks

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red65

red65

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Thunderbird Year
1965
Brakes not working. OK one day, nothing next day. No leaks, liquid or vacuum. Anyone experience this.

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Have no idea as to when replacement might have been done. would like to switch to a dual master upgrade. but, all mention of upgrades involve guessing as to what really works for this disc/drum system and weight of car. some have tried 67-70 Mustang, 72 F-100, etc. mounting, with some notching of cross brace involved. no idea if bore size and push rod length correct.
 
red65 said:
Brakes not working. OK one day, nothing next day. No leaks, liquid or vacuum. Anyone experience this.
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How is the brake pedal behaving? For example, does it depress half way down then stop, or go all the way to the floor? Also, is the fluid in the master cylinder reservoir?
 
goes to floor. fluid levels OK. Car used at least once a week with no previous brake problems.
 
OK, and with no leaks at the brake cylinders or brake lines, then as 74Harley noted an MC failure seems the most likely. The reason I asked about the fluid reservoir level is that one MC failure mode is the rear seal fails and brake fluid leaks into the booster. If this were the case, then the level in the MC reservoir would be dropping.
 
Thanks for info about possibly MC leaking into Booster. Have looked at having my booster rebuilt locally. Takes at least two weeks. Or, buying from T-Bird supply store to get sooner. . Prices not that different, except have to pay shipping to me and shipping old booster to them for core deposit refund. Also, have seen mentioned that the booster for cars with Cruise Control / Automatic Speed Control which my car has, is different from standard boosters. Mine is a Bendix booster.
 
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