Hydro boost install not working

[Snoots]

Does that involve removing the brake pedal assembly?

Yes. You'll likely only find one in the junkyard. Please refer to the last pic in post #2.

 

[Ricko1966]

Now,one more time, look at post #2 #7 and 12

 

[Dleslie212]

Just finished this up today after way too long.

My problem ended up being a defective unit. I returned it to Performance Online who sent me a replacement, and the new one works perfectly

For anyone in the future, the Performance Online unit has an adjustable rod for the booster. At least in my case, I didn't need to drill out a new hole into the brake pedal like some were suggesting. It lined up perfectly with my existing brake pedal hole. I had to cut down the threaded adjusting rod a bit, but other than that, just used the provided nuts to lock everything together

A few pics here

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next project is a painless wiring harness I got for Christmas

 

[frankwhite]

Just finished this up today after way too long.

My problem ended up being a defective unit. I returned it to Performance Online who sent me a replacement, and the new one works perfectly

For anyone in the future, the Performance Online unit has an adjustable rod for the booster. At least in my case, I didn't need to drill out a new hole into the brake pedal like some were suggesting. It lined up perfectly with my existing brake pedal hole. I had to cut down the threaded adjusting rod a bit, but other than that, just used the provided nuts to lock everything together

A few pics here

xc_hide_links_from_guests_guests_error_hide_media

next project is a painless wiring harness I got for Christmas

What did you use to cover the hole where the pushrod goes into the firewall? I bought this setup and the firewall is wide open. I see POL sells a boot that may work. Did you have the same issue?

 

[82BBC20]

I swapped out vacuum boost to hydro boost on my 82 C20 and did not swap the pedal and have no issues, the brakes work great!

 

[82BBC20]

You must be registered for see images attach

 

[82BBC20]

I used a piece of pool noodle to seal mine, worked great!

 

[82BBC20]

Dleslie212, I’m reading the painless manual for mine right now and will be starting the rewire when I’m done reading the next 110 pages, lol!

 

[Albrigap]

Thank you for the reply

1 - I'm going to go ahead and drain that ATF and replace with PS fluid today

2 - I thought about a cooler, but literally idling for two minutes and that hose is pretty warm to the touch. It just doesn't seem right, even without a cooler. I'd think I would at least get a little bit of brake when starting cold

3 - I did not change or alter the pedal. I measured the rod so that my pedal was just pushing in on the brake light switch to keep the brake lights off, but I didn't change or alter the pedal

I plumbed everything in the same as the first picture, with the tee on the return line

There is not ten cents difference between ATF and power steering fluid.

 

[xm20k]

Thanks for the great info guys I really appreciate this community.

Bit of an update. I took a closer look at the plumbing diagram above and realized I had the pressure in and pressure out lines backwards at the HB. I went ahead and drained out the ATF I had in there and replaced with PS fluid, and crossed those lines.

The old girl stops now. There's still a few issues. The brake pedal bounces up/pushes back up against my foot - I'm not sure what that's about just yet.

It's also still a little hard to stop - I'm guessing this is because I did a ****** bleed job, and didn't even bench bleed the new master cylinder. I also need to redo a few hoses that are too long/too short now that I swapped them around. I'm also going to bleed the brakes a little more, and flush the PS fluid out one more time and replace

Mine did the push back thing at first as well I needed to bleed it more, might need to do it several times let it sit in between to let any micro bubbles dissipate.

Edit: posted before I saw you had the unit replaced.

 

[xm20k]

There is not ten cents difference between ATF and power steering fluid.

There are anti foaming agents in PSF. ATF has Detergent and dye but no anti foaming agent as it only sees a couple hundred PSI at most were PS sees over 1000-1200PSI.

 

[Albrigap]

There are anti foaming agents in PSF. ATF has Detergent and dye but no anti foaming agent as it only sees a couple hundred PSI at most were PS sees over 1000-1200PSI.

OK, but it still don't know the difference!

 

[Blue Ox]

OK, but it still don't know the difference!

We replaced two leaking hydroboosts in fairly short order in our truck. The last one we switched to PS fluid and it's been working for over thirty years, so there must be something.