Brake Master cylinder

[ppetion]

On my 1970 911,I had the old simple master cylinder that attaches behind the pedal.

I have a complete kit pedal, booster , and master from a newer car (1977) I am thinking of installing it and replace the old system .
The installation will require some cutting behind the dash for the newer unit.

My questions are :

Will there be a significant braking improvement ?
Has anyone made this modification before /Cons and pros.

Thanks

[jrsully]

what is the plan for the car.? Just normal enjoyment of the car, oem 70 system works fine, gonna beat on it a little, maybe an upgrade.?

[75 911s]

I think the main improvement would be not having to stand on the brake anymore. The booster does the work for you. As for decreased stopping distance, I don't know. I would think you would need to upgrade your calipers and rotors. Personally I like the manual brake in my car. It's part of that raw go cart feel and there's more frunk room.

[ppetion]

The car will have a 3.2l motor , and 77 calipers/rotors .
It will be mainly street use but may track in the future .

[Bill Verburg]

Originally Posted by ppetion

On my 1970 911,I had the old simple master cylinder that attaches behind the pedal.

I have a complete kit pedal, booster , and master from a newer car (1977) I am thinking of installing it and replace the old system .
The installation will require some cutting behind the dash for the newer unit.

My questions are :

Will there be a significant braking improvement ?
Has anyone made this modification before /Cons and pros.

Thanks

Will there be a significant braking improvement ?

No, the stock m/c is 19.05mm, the boosted one is 20.6mm, the larger m/c bore means that the pedal will have a bit less travel and require a bit more leg, the boosted aspect reduces the leg needed. Generally this is a good thing to a point but the large amount of work needed to get this done for minimal change indicates against it. But it is your time and money

[ppetion]

Tank you . That's all I wanted to know. No upgrade for me .

[faverymi]

Have you consider an electric brake booster?