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Username Post: Brake booster size        (Topic#364080)
65DJF 
Newbie
Posts: 36

Reg: 10-01-17
01-22-21 06:03 AM - Post#2812611    

When I get my 65 Impala SS out of storage in a few months, I am planning to put a wilwood six piston disc brake conversion to replace the factory drum brakes. The car has a 396 in it and is a factory power brake car. My question is what size of brake booster to run on this application. I don’t know the amount of vacuum at idle right now because the the car is in storage. I have an indented valve cover to clear a larger brake booster. I would like to know what other people have used in their disc conversion. I was looking at a dual 8”, single 9” or single 11” booster.



 


mjc1 
Senior Member
Posts: 1717
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
01-22-21 06:51 AM - Post#2812619    
    In response to 65DJF

FWIW, I did Wilwood D8-4's on my 67 with a built 496. Used a 11" Delco Morane booster with a 1" master. Maximum 13" of vacuum, and the setup still works just fine.
Used the same style 11" booster/1" master on my current 327 65 single piston project and it works perfect as well. With the relieved stock valve cover you should be good with the 11". Personal opinion, but I think the 11 looks best underhood. Cheers.




1967 Grande Parisienne 4DR HT
My Flickr page



 
GreatNorthWoods 
"6th Year" Silver Supporting Member
Posts: 1218
GreatNorthWoods
Age: 78
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
01-23-21 05:40 AM - Post#2812705    
    In response to mjc1

I used an 8 inch dual in my '53 with 4-wheel discs. Works extremely well.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, EZ Wire, Vintage Air, Ididit column, Cruise/Tilt, PS, 59 Corvette Steering Wheel, 4-Wheel Discs, Posies Rear Springs, Coker Radials, Nova 10-bolt, Mustang II, NCA Continental Kit.


 
sz0k30 
"12th Year" Gold Supporting Member
Posts: 523
sz0k30
Loc: Oakland Co., Michigan
Reg: 10-12-08
01-23-21 06:38 AM - Post#2812710    
    In response to GreatNorthWoods

Why are you worried about changing the booster at all?



 
65DJF 
Newbie
Posts: 36

Reg: 10-01-17
01-23-21 09:17 AM - Post#2812736    
    In response to sz0k30

I guess I didn’t even think about keeping the original. It’s a single 9”. I could get the new master cylinder and proportioning valve and see if it works.



 
mjc1 
Senior Member
Posts: 1717
mjc1
Loc: Burlington Ontario Canada
Reg: 09-15-04
01-23-21 11:04 AM - Post#2812748    
    In response to 65DJF

Here's an interesting chart on Braking pressure vs Booster diameter.



1967 Grande Parisienne 4DR HT
My Flickr page



 


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