power booster rod length

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Oct 20, 2003 | 08:48 PM

teds74ford

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power booster rod length

Hey, This isn't so much a problem (now that I fixed it)as it is a little FYI. I bought a reman power booster for my 74, and the first trip out, the rear brakes locked up. I had an awful time putting it in. After some thinking, I took it apart and measured the output rod length, reinstalled it in the truck, and it was too long. The distance from the pedal out pushed the rod out and was applying constant pressure to the master cylinder. I took some measurements, and hand fabbed a spacer out of 1/8" steel plate, and now it works perfect. I don't know if anyone has had this problem, but maybe this will help. I cruised the junkyards to see if I was missing something, but they didn't have a spacer. I don't know what was wrong, but this little trick worked for me

Oct 20, 2003 | 09:22 PM

neverenough

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The push rod is adjustable you know.?.?

Oct 20, 2003 | 09:38 PM

teds74ford

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Yeah, I know. Still, shouldn't It line up with the pedal? That part wasn't adjustable, just the master cylinder input rod. Ted

Oct 21, 2003 | 07:01 AM

chevdog

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Some of the remanufactured and/or aftermarket boosters seem to wind up with rods that are a bit different. If it works, you should be fine.
I use a Bosch 7" booster in my 57 and after 3 master cylinders I realized that the rod was also a bit too long. I just could not get the rear brakes bled right. I also fabbed a 1/8" spacer - that took care of the problem right away. That was several years ago - no problems since.

Oct 21, 2003 | 11:11 AM

neverenough

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I haven't ran into that problem before, but, I wouldn't think a little preload on the booster would hurt as long as you can adjust the rod going to the MC.

Oct 21, 2003 | 07:35 PM

b.osborn

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Joined: Jun 2003

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From: Alberta

unhook the pedal let the booster rod come back all the way then pull your pedal all the way up measure the difference of the rod hole and pedal hole pull the booster back off and shorten the shaft the amount you measured reweld and VOILA your brakes
will be better then ever.

JBORN

67 f250 4x4
68 f100 4x4
74 f250 crewcab shorty 4x4

Oct 22, 2003 | 07:54 PM

Ford by Birth

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Joined: Oct 2003

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From: iowa

here's some more fyi, if the truck had cruise control, then the booster is different, the cruise control boosters have longer rods, found that out on my 79 f-150 2 wd