Could you, would you Hydrovac?

[1project2many]

Ohhh, saay...
I would, I would Hydrovac!

And I'd keep searching like a fox,
And I would get one in a box!

[57taskforce]

I apologize for thread jacking: ogre, I'm wondering since you've got hydroboost expierence, how hard do you think it would be to mount to the fire wall? I've already got a firewall mounted pedal assembly from classic parts. Im currently running 7" dual diaphragm booster. It has hard time stopping 35's. I've got hydroboost on my k2500 and it stops 35's without much issue. So I've been contemplating this swap for a while now. Any insight would be awesome.

[1project2many]

I apologize for thread jacking: ogre, I'm wondering since you've got hydroboost expierence, how hard do you think it would be to mount to the fire wall?

You know, this is the second time in this thread this has happened. I realize few have interest in the original booster but it's still a bit frustrating. I'm going to start a Hydroboost thread for you and copy your question to it.

[57taskforce]

Double post

[57taskforce]

I'm sorry. No need to start a thread on my behalf. I'll get what I seek on my own. I wish you all the best with your hydrovac, and hope all word out well.

[1project2many]

Not a big deal, but for some reason it's bugging me today. So I made this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=635391

I have some experience with Hydroboost so I posted my thoughts in answer to your question.

[_Ogre]

Originally Posted by 57taskforce

I'm sorry. No need to start a thread on my behalf. I'll get what I seek on my own. I wish you all the best with your hydrovac, and hope all word out well.

ask in my build thread so as not to further hyjack 1p2m's thread

[mod50]

I know this thread is fairly old, but I am wondering if I can get some info. I have a 50 chevy truck with two master cylinders reverse mounted under the dash and do not have a lot of stopping power. I am thinking that a hydrovac (or 2) that can be mounted under the cab may be what I need. I have done some searches for hydrovacs and see that the pictures of some units have a rod that looks like it would attach to the brake petal, what is this for, and are there units that have only vacuum and brake line connections.

Thanks
mod50

[dwcsr]

Originally Posted by mod50

I know this thread is fairly old, but I am wondering if I can get some info. I have a 50 chevy truck with two master cylinders reverse mounted under the dash and do not have a lot of stopping power. I am thinking that a hydrovac (or 2) that can be mounted under the cab may be what I need. I have done some searches for hydrovacs and see that the pictures of some units have a rod that looks like it would attach to the brake petal, what is this for, and are there units that have only vacuum and brake line connections.

Thanks
mod50

Hydrovac's are usually the size of a basketball so IF it fit nothing else would. You may want to start your own thread with some pictures so we know what your trying to do. Two masters seems odd to me unless its a NASCAR or dirt racer.

[1project2many]

There are a few different models of smaller Hydrovac. The Bendix units like pictured above are original and somewhat hard to find. There are slightly smaller units used in one ton trucks and motorhomes with Dodge and GM chassis in the '70s and '80s and somewhere around the house I have a part number for one.


I can only hope your masters are front/rear split and not left/right split. Hydrovacs apply when the primary circuit from the master builds pressure but they are dependent on brake adjustment also. If your brakes are mismatched, then a dual master / dual hydrovac unit might give uneven braking.

Hydrovacs can be very expensive to buy new or reman. Here's a page that has several. A dual hydrovac system could cost over a grand. I'd look into hydroboost for that money.

http://www.powerbrake-drivetrain.com...139/Categories

[mod50]

Thanks for the info, 1project2many. I do have front rear split on the master cylinders. I am going to try some other tings to see if I can get just manual brakes acceptable. Can hydrovac be used on front only, or would that cause too much brake imbalance?
thanks

[1project2many]

Don't use front only with boost. I've seen that done on a C60 once. The truck was very tough to drive.

[mod50]

Thanks for the help. You mentioned hydroboost, do these units all go between the brake pedal and master. I have my master cylinders under the dash so don't have room to add anything.

[1project2many]

Yes, the Hydroboost booster is between the pedal and master. It doesn't work with all master, though.