pro and cons of firewall vs under the car brake booster

Using stock gas tank in my "A" so mine are under the floor using a pair of CNC Brake and clutch master cylinders. Units are boxed in at the bottom for protection. Floor boards are like Henry made them, removable for access to battery and brakes.

 

The only problem with a vacuum booster located under the floor is moisture/dirt contaminating the air intake. In a dry clean enviroment, there's not much of an issue, but if driven in harsh wet or dirty/dusty conditions there will be problems with the booster control valve and/or diaphragm(s). One solution is to remote the air intake into the cabin and through a filter, like frame-mounted truck hydrovacs use.
Keeping the brakes manual will simplify the system as most light weight vehicles do not require power assist, unless there are physical limits or needs.

 

It isn'y always because it's better, usually it is because it's cheaper to manufacture or service. Properly installed and maintained, either works well in my opinion.

 

They also make remote boosters that can be mounted anywhere. You could leave the master on the firewall and mount the booster under the floor or wherever you have room. Bad part is I think they are expensive. Some motorhomes came with them if your lookig for used.

 

Me too^^^^^^^

 

I can't think of any pros to having it under the floor except for looks.
I have two rods with floor mount and don't like either one.
My coupe is eventually going back to the firewall because I like for mechanical components to be easily accessible for maintenance. My truck will have to stay on the floor because of limited space for it on the firewall or it would be there too.

 

Mines Under The Floor Behind The Drivers Seat And Works Just Fine,

 

I chose form over function on both of cars,
under the floor. Dumb Huh! They both work fine.

 

I built a '38 Chevy with a firewall mount.

Built a '46 Ford with an underfloor mount.

Never had an issue with the Chevy brakes, stopped great.

Ford was never quite so good, and killed a booster with rust.

Next one will have firewall mount.

Cosmo

 

I like/have a clean firewall, it's easier to work without all the stuff and lines in the way.
I have this one under mine, for about 3 years now and it's working just fine.
http://www.classicperform.com/Store/1947_59_Trucks/4754BBD.htm

 

There are few items on a car that look as ugly as a brake booster IMO, I'd put it under the car based on looks. Bob

 

I put the booster under the floor of my Chevy panel truck so I could use the stock pedals, I did run a vacuum line loop up the fire wall to a point above the manifold. This set up has performed flawlessly for 20 plus years in the oh so moist northwest.

 

Just curious, but what was the purpose of the vacuum loop?

 

So don't firewall mounts esp if you have drum brakes.
Mine's on the firewall with RPV and four wheel drums...