Hydro Boost Project

[Dmod1974]

You should have some free play between the MC piston and the hydroboost pushrod with the pedal all the way up.  With the engine off and the hydroboost accumulator discharged after pressing the brakes down several times you should be able to feel it by hand as you depress the pedal.  After the pedal take up there should be a period of lighter effort before the MC piston starts to move.  If not, you're diagnosis is right and the compensating ports are likely being blocked off or restricted.  I'd shoot for about 1/8" minimum to account for heat expansion and any unintended pump up in the assist unit.

[Cudajason]

You should have some free play between the MC piston and the hydroboost pushrod with the pedal all the way up.  With the engine off and the hydroboost accumulator discharged after pressing the brakes down several times you should be able to feel it by hand as you depress the pedal.  After the pedal take up there should be a period of lighter effort before the MC piston starts to move.  If not, you're diagnosis is right and the compensating ports are likely being blocked off or restricted.  I'd shoot for about 1/8" minimum to account for heat expansion and any unintended pump up in the assist unit.

Yes sir that seems to have been my issue.  I spaced it out with some washers and the brakes are not dragging now.  nit sure it is totally fixed yet, the pedal is not always coming all the way back, but I will work on that.

Sure was nice to take the car for a spin!

[anlauto]

Yea, but did you take your kid to school ?

[Cudajason]

Yea, but did you take your kid to school ?

sure did!  he was happy.

[YellowThumper]

Yea, but did you take your kid to school ?

sure did!  he was happy.

Close call there with the kid. Glad that worked out for you.

[Brads70]

Some good info here? Push rod depth gauge  and I noticed they recommend 1 1/8" MC for hydroboost?
https://baer.com/Remaster.html

[Cudajason]

Some good info here? Push rod depth gauge  and I noticed they recommend 1 1/8" MC for hydroboost?
https://baer.com/Remaster.html

Oh cool a new tool!

I love that Bear MC, I was going to go that route, but damn its pricey

The Wilwood is a 1 1/8th bore, as Wilwood recommended.

I did some reading and the pedal return is common in new instals, might just need to drive it a bit and bleed the HB unit.

I will also rebleed the brakes and see what that does.

[Brads70]

Some good info here? Push rod depth gauge  and I noticed they recommend 1 1/8" MC for hydroboost?
https://baer.com/Remaster.html

Oh cool a new tool!

I love that Bear MC, I was going to go that route, but damn its pricey

The Wilwood is a 1 1/8th bore, as Wilwood recommended.

I did some reading and the pedal return is common in new instals, might just need to drive it a bit and bleed the HB unit.

I will also rebleed the brakes and see what that does.

I mentioned this because in their video they said 0-.005" clearance  of the pushrod? 
Maybe you will need a light spring to return the pedal?

[Cudajason]

Some good info here? Push rod depth gauge  and I noticed they recommend 1 1/8" MC for hydroboost?
https://baer.com/Remaster.html

Oh cool a new tool!

I love that Bear MC, I was going to go that route, but damn its pricey

The Wilwood is a 1 1/8th bore, as Wilwood recommended.

I did some reading and the pedal return is common in new instals, might just need to drive it a bit and bleed the HB unit.

I will also rebleed the brakes and see what that does.

I mentioned this because in their video they said 0-.005" clearance  of the pushrod? 
Maybe you will need a light spring to return the pedal?

INTERESTING!

I will try it with one washer instead of two and see if that helps.  of course I need to sort our my overheating issue first.

[Cudajason]

A long over due update.

I have not really been happy with the way the car stops with the Hydro boost, they work but not OH WOW Best upgrade ever type of thing.

This winter I order a MC pushrod checker and sure enough it looks like I filed down the MC spacer a little too far and there was a gap.  I order a new spacer and filed it down a little less, I hope this is the change I was looking for.

[Cudajason]

Wow, that did the trick...the brakes now work like I was expecting.

took a little bleeding of the power steering and filling it up a few times, the pedal feel is good, it returns better then it did, and she stops well.  Locked up the fronts when I touched them to quick.

Amazing what happens when you use the right tools and do think right.

I was actually going to give up on the Hydro boost system with they way they were working, then the system did not want to bleed and was howling away.  my fist spin on Sat, was better but the PS pump was still howling, especially when I steeped on the brakes.  Checked the fluid, I figured it was low, filled it up and it finally quieted down.  Now I am happy with it.

   

[YellowThumper]

Great to hear this.
Braking should be spot on with a hb setup.
Mine has been flawless for almost 20 years now.
Re: pump howl, yes it takes time for the fluid to circulates sufficiently to eliminate the howling.
There should be a bleeder on the unit. Same as the brake bleeder.