Brake booster puzzle
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Mountain Pass
Joined: Oct 2023
Posts: 163
Likes: 59
From: Kaslo, BC, Canada
Brake booster puzzle
So I am converting my 79 F150 from automatic to manual. In order to accomplish this I have acquired a pedal box supposedly from a 1979 Standard.
The standard box brake pedal arrived with a master cyl push rod attached which is about 10" long with a rounded point to connect with the booster/master cylinder. The automatic pedal box brake pedal connects to the brake booster with a push rod that is about 5.5" long and had a round hole about 1/2" in diameter that connects to the brake pedal.
Anyone have any insight into why the differences???
It looks to me like I need to add about 2 - 2.5" to the automatic push rod to make these parts work together.
The standard box brake pedal arrived with a master cyl push rod attached which is about 10" long with a rounded point to connect with the booster/master cylinder. The automatic pedal box brake pedal connects to the brake booster with a push rod that is about 5.5" long and had a round hole about 1/2" in diameter that connects to the brake pedal.
Anyone have any insight into why the differences???
It looks to me like I need to add about 2 - 2.5" to the automatic push rod to make these parts work together.
Laughing Gas
Joined: Jan 2014
Posts: 1,077
Likes: 500
From: Kenai
I've read on here there were 27 (I think) different combinations of brake boosters for these trucks. Your best bet might be to have the one that fits your application and have it rebuilt. Good luck
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Mountain Pass
Joined: Oct 2023
Posts: 163
Likes: 59
From: Kaslo, BC, Canada
Solution - At least the solution U came up with
Turns out that, with superficial differences, the automatic pedal box has the pedal pivot points set about two inches closer to the firewall than the does the standard pedal box.
My solution is to use the automatic pedal box with the standard trans pedal set. had to add a brake switch push point and fab up some bushing supports for the outsides of the box but other than that it worked out quite well.
My solution is to use the automatic pedal box with the standard trans pedal set. had to add a brake switch push point and fab up some bushing supports for the outsides of the box but other than that it worked out quite well.
Lead Driver
Joined: Mar 2004
Posts: 8,922
Likes: 153
All auto pedal boxes have no bushings, just a through a bolt. All manual boxes have a bushing attached on each side of the box to take the extra stress of the clutch. There are many different pedals and boxes depending on the year and application.
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