Adding a brake booster?

[Schyrjajew]

Greetings from Switzerland!

My 69 Valiant 170cui has 4 drum brakes (9 inch) without a brake booster.
I would like to add a brake booster, because I might want to install the bigger engine at some point and I'd feel safer.
Which booster do I need exactly?

This is the master cylinder I have.

 

[Steven190]

I would contact Cass at Dr Diff to see what he has and can he ship to you.
DoctorDiff Drivetrain Components

 

[RedFish]

A vacuum assist reduces pedal effort for lady legs. It isn't a brake performance upgrade.
"Bigger engine" often includes a performance cam that wont produce enough vacuum to support the assist.

 

[65 Dartman]

I would consider upgrading to disc brakes as a performance upgrade before a booster if you are considering a larger engine.

EDIT: if you attend some of the American Car shows, speak to some of the Mopar people about sourcing parts locally. I’ve got a friend from Wettingen who attends the shows. He owns a 66 Barracuda that was assembled over there

 

[Inertia]

Power booster does not improve brakes.
It merely reduces pedal effort.
You'd still have insufficient brakes for an engine upgrade.

 

[cojohnso]

Disc break upgrade will do far more for breaking performance. And a must if you put power to the car in its future. My 440 GTX at a meer 425 horse had problems stopping as I wished. And that's with the drums working as well as they could. A front disc upgrade improved breaking I'm betting 30+%. Meaning, what took 200' to stop now can in about 130'. I'm still running drums in rear. But I'm feeling better than not.

 

[BillGrissom]

See ebay for booster/MC/brackets. Was ~$140 last I saw. Most use a GM booster & cast-iron MC.
Before those were avail, I put booster brackets from a 74 Slant on my 65 Dart & booster-MC from a 95-99 Breeze ABS.
You don't need a booster w/ drums. Easier to switch to a 7/8" booster w/ 2-4 bolt adapter plate ($30 ebay). Dr Diff sells a kit.
Many say they don't need a booster w/ front disks, though most all new cars today have one.
Cheapest front disk conversion is Scarebird. Many use Wilwood ($$$).

 

[hwd2]

I am going to 'upgrade' (albeit slightly) the small-bolt discs on '70 Dart to the single-piston setup from '74 Duster. Main reason is to acquire the larger stud 4.5" pattern. I could use the removed parts (from Dart) to install on '69 Valiant, however, the (four-piston) calipers in bad shape - so no good even for cores. Rather than purchase (pricey) new or rebuilds, I will, for now, leave the 9-inch drums intact and add power-assist. Can I use the Dart booster and what M.C.? Will the inlet area of the booster 'interface' with the pedal linkage under the dash? Any tips are appreciated. Note: Valiant stored for winter to at least end of Feb.