Hi folks,

Finally got the air out of my braking system (9" drums x4, '68 Dart 270).

Now I have an intermittent problem... sometimes the brake pedal will slowly descend to the floor while sitting at a stoplight.

I just put a refurbished master cylinder on it a few months ago. But IIRC this is a symptom of a bad master... am I right? There is no leakage of fluid in the system.

-Mac

Yep, almost certainly bad master

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Another quality rebuild from A-1 Cardone?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Might be an "Ultima".

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

This one came from Napa, but I don't remember who remanufactured it.

Convert to the late model 2 bolt aluminum master cyl and you wont have any more problems.
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Ferrari 250 gto
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Motorcycle Tires

His '68 Dart already has a twin-pot master cylinder. Also, twin-pot master cylinders are prone to problems, just like single-pot master cylinders.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Not true. If the original annodizing is gone they can corrode and fail quickly. Also many people have had spongy pedal problems with the AL master. Once I get my Swinger back on the road I hope I'm not one of them.

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Joshua