Best way to increase Vacuum?

[RedSwinger]

I recently installed Power Disc brakes on the front of my 72 Dart. The car has a mild cam, and is not proucing enough vacuum for the brakes. What is the best was to solve this problem? An electric booster, a canister?
Thanks in advance for your help!

 

[70aarcuda]

how big is the cam?

have you tried advancing the timing and adjusting the carb to maximize the vacum?

 

[OldVart]

Are you sure you don't have a vacuum leak or a bad brake booster? A "mild" cam should not kill that much vacuum. Are you sure your timing and carb are set for maximum tune?

 

[RedSwinger]

No, we checked the booster unit and it is fine (brand new).

 

[1968FormulaS340]

How much vacuum do you have?

 

[rumblefish360]

Besides a electric vacuum pump, which are pricey, a set of Rhoads lifters will help.

 

[Vs29H1B]

Not trying to high jack this, but with an A body, why power brakes?

A bodies don't need power brakes IF you use the proper master cylinder, with bores matched to the size of the rear wheel cylinders and the type of caliper (in this case you are using a single piston type '73-'76 caliper).

Also, Abodies are light enough to stop well without need for power assist.

Eliminating power boosters frees up a lot of space under the hood.

Once you eliminate the booster, you will not need to worry about vacuum for the power brake booster...just some thoughts...

 

[dgc333]

Disk brakes take more pressure than drum brakes to get the same level of stopping power. You can only compensate so much with the master cylinder bore because of the need to move more fluid with disks. Power disks will reduce leg effort and give you finer control over the brakes. IMHO, don't remove the booster.

To the OP; You need to measure the manifold vacuum you are getting, if you have 12 or more "Hg then you have plenty to run the booster and your issues is else where. The initial timing is a good place to look for more vacuum. If you have changed the cam it is very likely you need more initial timing than the factory setting. Adjust the initial to obtain max vacuum and don't be surprised if you wind up in the 15 BTDC range. If you wind up that high then you will need to limit the total by reducing the slots in the advance mechanism.