hydro boost options

[bmc69]

I used the Astro van hydroboost on my '69...easy to adapt, but I had room for a straight mount.

 

[toddz69]

Did the Tahoe unit come with the threaded actuating rod? That looks like what I need to replace my F250 unit...

None of the factory units have threaded actuating rods to the best of my knowledge.

Todd Z.

 

[ericwilkison]

Did the Tahoe unit come with the threaded actuating rod? That looks like what I need to replace my F250 unit...

I installed my directly to the firewall. The hydroboost unit is from a later '98 or so Astro. It normally has the angled firewall mounting bracket, but I swapped it out for a '94 Astro strait mount bracket. The later Asto unit input rod is almost exactly the same length as the stock master cylinder, and it has the same pedal hole size. Long story short, with this combo you don't need the threaded actuating rod.

I clocked the hydroboost unit with the gold cylinder up to give a lot more clearance to the valve covers. To get the master cylinder oriented correctly I used one of these brackets. The seller, catfan, is a member here as well.

https://www.ebay.com/itm/Early-Bron...475301?hash=item4b6e15e2e5:g:xvgAAOSw7R9cN4la

 

[toddz69]

I installed my directly to the firewall. The hydroboost unit is from a later '98 or so Astro. It normally has the angled firewall mounting bracket, but I swapped it out for a '94 Astro strait mount bracket. The later Asto unit input rod is almost exactly the same length as the stock master cylinder, and it has the same pedal hole size. Long story short, with this combo you don't need the threaded actuating rod.

Eric:

What is your pedal height off the floor (pad surface to floor) with that Astro unit? I got some measurements awhile back on the pushrod length and I felt it would place the pedal too close to the floor for my liking but maybe I was mistaken.

Thanks,
Todd Z.

 

[mrdrnac]

Did the Tahoe unit come with the threaded actuating rod? That looks like what I need to replace my F250 unit...

The Tahoe unit was not threaded, I had to cut it and thread it and buy a matching threaded end piece. Overall, it was easy enough to thread.

 

[ericwilkison]

Eric:

What is your pedal height off the floor (pad surface to floor) with that Astro unit? I got some measurements awhile back on the pushrod length and I felt it would place the pedal too close to the floor for my liking but maybe I was mistaken.

Thanks,
Todd Z.

About 7" from the floor. It's almost dead even with the clutch pedal. I snapped a quick picture of the rod as it's installed also.

 

[papy]

can you use hydro boost with front disc and rear drums?

 

[toddz69]

can you use hydro boost with front disc and rear drums?

Yes.

Todd Z.

 

[toddz69]

About 7" from the floor. It's almost dead even with the clutch pedal. I snapped a quick picture of the rod as it's installed also.

OK thanks.

Todd Z.

 

[papy]

Yes.

Todd Z.

good to know! not sure if i am going hydro and vac yet.
thanks

 

[catfan]

Do you all think the 5/8" rod thru the pedals would be strong enough with a 3/16" hole drilled thru it?