CK5
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Hooked directly to manifold vacuum (port on manifold) it's stuck on the floor again. This is really starting to piss me off.
 
Found these answers on another thread, guy had similar problems with a fresh jeep build.

- booster to master cylinder rod is too long not allowing brake fluid to fill back to into reservoir fast enough. As the fluid heats up in the lines the brakes apply because the fluid cant go back to the reservoir.
- pedal to booster rod is too long

Booster to Master cylinder rod too long? I'm pretty sure I threw out my older booster and MS to compare to the one that came with the MS/booster combo I bought.

Pedal booster rod was installed on the booster when I bought it.
 
Found these answers on another thread, guy had similar problems with a fresh jeep build.

- booster to master cylinder rod is too long not allowing brake fluid to fill back to into reservoir fast enough. As the fluid heats up in the lines the brakes apply because the fluid cant go back to the reservoir.
- pedal to booster rod is too long

Booster to Master cylinder rod too long? I'm pretty sure I threw out my older booster and MS to compare to the one that came with the MS/booster combo I bought.

Pedal booster rod was installed on the booster when I bought it.
Was just considering if the geometric setup from your pedal doesn't match the throw on the booster

Or maybe the prop valve is sticking/holding
 
Ever messed with the booster to master cylinder rod adjustment? That seems like a likely culprit
 
Found the old original booster for the truck and measured the pedal to booster shaft and the shaft stick out on the booster/MS and it's damn near identical. Give or take a 1/32" anyway. WTF

image.jpeg
 
Only other thought is a bad wilwood Prop Valve. Maybe I'll call wilwood in the morning and see if they have any ideas.
 
No, but I'd shorten it if available

Checked and there's about a 1/16" of clearance.

its just weird that I was able to replace the booster and the issue went away long enough for me to go on a trip. Then later it came back again.
 

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