As per the title, my 65 coupe 289V8,man. 3 spd. with no A.C., no power str. or brakes (4 whl. drum), has brake pedal return problems. This is and has been my daily driver for the past 20 yrs. About 4000 miles ago the complete brake system was replaced with all (100%) new parts. Only the addition of DOT 5 silicone fluid is different from factory stock. The pedal sticking has even caused the brake lights to stay on after the car was parked, just a slight pull up with the toe temporarily fixed it.
The questions are ,, A.= Is there a return assist spring up under the dash on the pedal rod mechanism ??
2.== Other than a good bleeding,,what should I be looking for??
Thks ,, chuck92130 (toeing his pedals)

 

I think you need to move this posting to the classic mustangs forums for an answer

https://mustangforums.com/forum/classic-mustangs-16/

 

yeah. Im goind to delete this as it is in the wrong section. Try the Classic section like Dave stated.

Matthew

 

I've got the same problem in my '67 coupe and I know i have a worn brake/clutch pedal support. I've bought the roller conversion from CJ Pony Parts, but have not had the time to put it in yet. You should inspect you pedal support to see if the bushings are good, or like mine, they may be totally gone and the holes are starting to go egg shaped on me. If you didn't have the problem before you put the DOT 5 brake fluid in, I suggest going back to DOT 3. I personnally don't like the DOT 5, as it makes the brake pedal spongy in older cars that weren't designed for it. DOT 3 is perfect for old cars and you don't need the DOT 5 anyway (more expensive, no benefits). Hope this gives you an idea of what to do.

 

Do NOT switch back to DOT 3. DOT 5 and DOT 3 are not interchangeable and should never be mixed. Doing so can cause swelling of any rubber components in the system.

DOT 5 will not make any brake system spongy all by itself. If you do not properly flush the system with denatured alcohol, the weakened rubber parts may cause a spongy pedal, but saying DOT 5 in a completely new system will cause a spongy pedal is false. Saying it has no benefits is also false, as it boils at a higher temp and is non-hygroscopic.

If the brake pedal is sticking down, check the pedal assembly as previously suggested. If not that, then suspect the master cylinder.