CK5
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Is there supposed to be a pedal return spring under the dash that you are missing. Sounds like the return spring in the booster can't overcome vacuum to return the pedal.

Yes the return spring is on there. Remember, I cannot physically pull the pedal back with my hand let alone a little return spring.

Keep the ideas coming
 
You said you have to hold the pedal down for a period of time for it to occur, but does it matter how far you push the pedal down?

Maybe it's over extending the booster?
 
You said you have to hold the pedal down for a period of time for it to occur, but does it matter how far you push the pedal down?

Maybe it's over extending the booster?

That's one of the working theories as well. I'm not happy with the pedal feel and I think it maybe traveling to far. I still want to double check the MS output volume of each port and finally put this front/rear port debate to bed. As I mentioned earlier, it seemed as if the front was putting out less food than the rears when bleeding them. Currently it's plumbed with the front reservoir-front wheels and rear to rear.

image.jpeg
 
And I stumbled upon a thread about a Dana 60 not bleeding right. Got me thinking.......

Sumting wong heeer

image.jpeg
 
Are these rebuilt mc's. Maybe the bores aren't smooth at the end of the travel because they weren't machined well.
 
Yeah, I've seen that before now that you mention that
 
Im thinking there is enough air in your brake system somewhere allowing your master cyl to not return with enough pressure to open the two way valve in the booster allowing it to return. ? Maybe?
 
If your bleeder screws are higher than the fluid lines then you need to take the calipers off put a spacer between the brake pads flip the caliper so the bleeder is lower than the fluid line and bleed the brakes that way. My rear calipers have to be done that way.

The only other thing is I had to put a residual pressure valve in on the rear brake line to keep pressure in that line, along with having the adjustable proportioning valve.

That's all I got.
 

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