This is a complete bolt in kit that uses a modern power booster and dual circuit master cylinder (and proportioning valve) mounted to the firewall using the bolt holes for the factory air box. It shares almost nothing in common with the original 1957 and 1958 buick brake system. a new brake pedal is included that pivots from an entirely different location. This does away with the complicated pedal bracket mechanism and gives you a modern 6:1 pedal ratio. The brake pedal bracket and pushrod now go through the factory air vent opening, not the factory location. The brake pedal uses a GM brake pedal pad and has an original appearance and location. A modern GM booster and master cylinder give a significantly improved braking feel and power while adding safety through the dual circuit system. The new firewall bracket bolts to and supports your steering column same as factory. 
 
This can be used with factory drums, disc/ drum or disc/ disc. Let me know what brakes you have at check out and I will send the correct proportioning valve. 
 
It will have the pedal feel of a modern car- minimal effort required with a positive and firm feel. No more soft or sloppy pedal! 
 
Installation is fairly straightforward- no cutting required, this kit doesn't involve anything permanent that can't be undone in a couple hours! You have to remove the driver side air box, vent door, master cylinder, a small section of brake lines, and then this kit bolts in. Brake lines are included and pre-bent. Installation time is about 4 hours. 
 
Brake Lines: Two brake lines are included. One goes from rear proportioning valve to feed the rear brakes (you will have to splice in to your original rear brake feed).  The other brake line goes from the front of the new proportioning valve to the factory T junction block located near the front driver side wheel and feeds the front brakes (no cutting or flaring needed). 
 
This is only for 1957 and 1958 Buicks. It fits all models of Buicks for those years but does not fit any other years.
 
This kit comes with everything including proportioning valve, brake lines, and hardware! All you need is brake fluid and a port on your intake to plug into vacuum. 
 
Also, you will have more room in the valve cover area that the original air box. so it clears all original engines just fine, and will provide additional clearance for vehicles with a swapped engine. 
 
The firewall box has water drain spouts and new drain hose is included. water will be able to drain out from the windshield area at this two points. 
 
Included parts:
Firewall box made that is an exact fit for 1957-1958 Buick firewalls
Brake pedal bracket, goes through air vent opening 
Brake pedal W/ Bushings, clevis pin, and rubber pad 
GM style brake booster
GM style master cylinder 
All new high quality bolts 
2X 3/16" brake lines- custom cut, bent, and flared
Proportioning Valve + metal lines (mounts beneath MC, as pictured)  
3/8 Vacuum hose
Water drain hose, same function as factory 
Misc. hardware 
Instructions with pictures
 
Brake booster options: 
-9" single diaphragm vacuum booster in gold zinc. This is the best optoin for drum/drum brakes. Anything more will feel too powerful. This is what's pictured here on the website. 

-9" single diaphragm booster, in chrome, otherwise same as above option 
 
-11" single diaphragm booster in varying finish of gold zinc or black powdercoat. This is the best option for disc/disc or disc/drum. This booster is considreably more powerful than the 9" booster. Our supply of the finish is inconsistent so we provide which finish is available. 
 
-Hydroboost. This booster uses power steering fluid rather than vacuum. It is our most powerful booster, and over kill for most applications. The booster housing is longer so it may cause minor interference issues. This is best for high horsepower applications without a good vacuum source and with front disc brakes. 

Proportioning valve optoins: 
-PV4 works for drum/drum or disc/disc. It proportions the brake fluid pressure eqully front and rear. 
-PV2 works for disc/drum. it proportions the brake fluid pressure with a front bias. 
 
All metal parts are CAD designed, laser cut, formed with a compuer conrolled press brake, tig welded, and powdercoaed satin black right here in the Pacific Northwest.