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dexleo2 01-11-2017 02:05 PM

new member looking for help
 
Hello all,

New member and I really looking for some idea's on a problem I'm having on a 1978 ford f150 4X4 with a 351M. Okay here is my problem when I bought the truck the brake pedal would stick to the floor I could pull it back up with my foot under it and yes the brakes worked its just the pedal would not return up. So I Pulled the vacuum booster line out of the booster and the pedal returned to the upright position. So i bought a replacement booster with master cylinder, I kind of thought why not do them both together who knows how long the master cylinder would last so I replaced them both. Well same problem with the vacuum booster replaced.. Brakes work but pedal will not return... I'm out of ideas. again if I pull the vacuum line out of the booster the pedal will return... I'm at a loss any advice would be greatly appreciated.

smokey 01-11-2017 03:42 PM

Sounds like you got a bad booster. New doesn't always mean good.

fatherdoug 01-11-2017 03:52 PM

I seem to remember several different choices on the '78 booster/master cylinders, such as with or w/o cruise control, etc., etc. Make sure you have the right application, also.

dexleo2 01-11-2017 05:04 PM

thanks for the replies and you guys have kind of confirmed what I was fearing, So then is there a particular method to test the vacuum booster? I'm sure its the right part it matches the one that I took off of it assuming it had the right one on it...

BKW 01-20-2017 09:57 PM

1973/79 F100/350: There are TWENTY TWO different brake pedals, NINETEEN different master cylinders, SEVENTEEN different P/B boosters, SEVEN different clutch pedals, I kid you not!

Whatever booster is used, it has to match the brake pedal.

There's an ID number stamped on the brake pedal, post what it is.

dexleo2 01-22-2017 09:03 AM

WOW... thats something I would have never guessed that many different styles are out there.. I just had my shoulder reworked and once it gets healed up and I have more movement in it I will get that number posted.. Thank you.


Quote:

Originally Posted by BKW (Post 687803)
1973/79 F100/350: There are TWENTY TWO different brake pedals, NINETEEN different master cylinders, SEVENTEEN different P/B boosters, SEVEN different clutch pedals, I kid you not!

Whatever booster is used, it has to match the brake pedal.

There's an ID number stamped on the brake pedal, post what it is.


cbaker65 01-23-2017 09:38 PM

Quote:

Originally Posted by dexleo2 (Post 687851)
WOW... thats something I would have never guessed that many different styles are out there.. I just had my shoulder reworked and once it gets healed up and I have more movement in it I will get that number posted.. Thank you.

One trick you can try ,is a mirror ,or take snap shots at the pedal
with a camera or phone!...:cooldude:

dexleo2 03-18-2017 07:09 PM

Well shoulders feeling great.. The weather is great... So i tore into the truck, Decided to tear the booster and master cylinder off again and check all the linkages and such. Well Needless to say I found the problem. The bolt in the bottom of the linkage on the out side of the firewall was rusted up and was the case of my problem.. So now on to the steering issues now that the brakes are back up and running!!!! Thanks for the idea's guys your the best!!!!

DNFXDLI 03-18-2017 07:28 PM

Glad to hear that you got it sorted out.

Jasperrc 03-20-2017 08:22 AM

Good deal!


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