Hello, I'm trying to pick out a brake booster for my 1970 Buick Skylark 350c.i. with MANUAL drum brakes. Im plan on purchasing a 9 inch booster because I dont think the 11 inch will fit. In the future I plan on converting to front disc brakes, but will currently drive with drum brakes as budget goes. Will I have to change my brake booster to a double diaphragm when I do the conversion in the future? Last question, I've noticed that the rear bracket of the 9 inch boosters are angled upwards, which worries me since the resevoir fluid wont be level like it currently is. Will this affect anything? What is the technical reasoning behind it? Thank you for reading!
Check with others, but I recall the master cylinders are different for manual versus power brakes. If my memory is correct, there could be a issue with the position of the brake lines relative to the new master cylinder.
Just get the correct booster and Master cylinder for the application , weather it is 9 or 11 inches. You have to look at the shop manual because where the rod from the booster goes onto the Brake pedal itself is not where the rod is now. The brake pedal is drilled for both holes. You will have to adjust the rod. You also will have to maybe make some new lines from the master to the Proportioning valve. Shop manual is the answer to see how everything is set up.
'70 will be 11 inch booster (if u are going stock). U will have to modify/replace brake lines at the m/c.
