Hydroboost Pedal Feel - Should it feel this spongy

[KDML]

TOFIC

I started your re-bleed procedure, but wanted to confirm something before I continue.

I disconnected the LP line from the PS pump and capped the PS pump connection. The other end of the line is still attached to the Hboost. I placed the hose in a jug and started the engine and let it idle. Nothing came out of the hose - is that OK?. I couldn't get anything to come out of the hose until I stepped on the brake pedal. Fluid flowed most when I had the pedal down. Once I let up it slowed to a trickle then stopped.

Just want to be sure this does not indicate a problem.

Thanks

 

[TOFIC]

nope sounds good, keep going.
I am still betting on something in the system so continue.
TOFIC

 

[KDML]

So I finally got back at my brake issue. I ran throught TOFIC's flushing process 2 times and still had the same results. I swapped in another master cylinder and the sponginess went away - so it was either a problem MC or I did a better job bench bleeding it. I still can push the pedal to the floor, but it was well beyond the point of lockup and I literally push myself out of the seat doing it. If I get the urge one day, I might pull apart the hydroboost unit and rebuild it just to be sure there is not some lingering issue, but I drove the Bronco for an hour the other night and all went well

 

[Ed74]

KDML,

Glad to hear everything worked out. I currently have a BC setup in my bronco and I would like to convert it to an Astro hydroboost as well. Can you possibly post some pics of your set-up. It would be greatly appreciated

Thanks,
Ed

 

[TOFIC]

Ed74
I have some pictures of the tee setup and the dual return
Also have some of the shifted hydroboost setup (mounted in clutch pedal location)
Want some of these pictures??
TOFIC
KDML
glad you found your problem, I trust you are enjoying the "stop on a dime, and get 9 cents change" style of braking??

 

[Ed74]

Thanks TOFIC! Some pics of the tee and dual return would be great. I am looking to see how KDML mounted his Astro booster to his BC angles bracket.

Thanks again,
Ed

 

[KDML]

Pictures as requested.

Setup consists of BCB angle bracket, threaded rod couplers to space hydroboost off the bracket, homemade flat mounting plate and the astro hydroboost. I could not find a threaded rod end I liked to mate the hydroboost pushrod to the BCB bracket so I ordered a 3/8 rod end blank from McMaster-Carr (#6065K241) and drilled, shaved and threaded it to fit. I bought adaptors from Summit to convert the hydroboost high pressure fittings to -6an (part numbers were AER-FBM2608 and AER-FBM2609). If you have any specific questions or need other pictures let me know

Good luck

 

[Ed74]

Excellent Pics! Thank you KDML