View Full Version : 9" Brake booster

09-15-2017, 03:54 PM
If you were to put on a salvaged car's brake booster what car would work on 61 thunderbird? I am using a 7" booster when I converted to disc front. That 7" booster is not doing the job. Thought would try a 9".

09-15-2017, 06:12 PM
I fit a 9" from a 79 f350, but it was a nightmare to fit. Search on my name for the thread and pics

09-30-2017, 08:53 PM
I think you need at least an 8" booster for disk brakes. 7'' wouldn't have enough pressure. Maybe ring one of the brake company's to see if they can help like MBM brakes. Or look at 66 Tbird booster.

09-30-2017, 09:53 PM
I think you want to go with an 8" booster instead of a 9"... You might have difficulty shutting your hood with a 9" one. All of us who have done dual mc/power booster upgrades have used the 8" booster, as recommended by Dave ~ simplyconnected....

02-09-2018, 12:47 PM
Has anyone done the disc brake conversion using the stock mechanism with the 7 or 8" hotrod booster? If so did you cut the booster rod and add a heim bolt? How much did you cut off the bolt?

02-09-2018, 02:22 PM
IMPORTANT: You need at least a DUAL DIAPHRAGM 8" booster for power disk brakes. Here is a picture and a link.

http://piratejack.net/universal-8-dual-diaphragm-booster/http://cdn6.bigcommerce.com/s-iykf1m/products/549/images/675/PB7537__31604.1446059524.190.285.jpg?c=2 (http://piratejack.net/universal-8-dual-diaphragm-booster/)

Notice, the 'step' on the RH side is for one of the diaphragms. A dual-diaphragm booster nearly doubles the boost of a single diaphragm booster.
Do not get a single & dual diaphragm booster confused. They are a lot different. This booster's major diameter (10") is the same as the OEM Squarebird boosters from 1960 but it delivers a whole lot more boost.

I'm using these in two heavy Fordoor cars and I love them both.

booalou, YES! If your Squarebird came with a booster under the hood you can cut the rivets off and mount this new booster to it. Many of our conversions used the existing firewall bracket.
All hardware from the OEM bracket to the pedal remains stock. - Dave