70 F100 brake problem
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70 F100 brake problem
I have a 70 F100 sport custom that has been sitting for around 7 years. I was working on the front brakes but I can not get the passenger side front to set up, the drivers side will. I have looked at the wheel cylinder and it looks good, but I am not getting any fluid to it. Where to go now?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Meandtheboy Welcome to 
and the Bumpside Forum. 
Bossman, If you were going to put one of my kids in a 44 year old truck that had been sitting for 7 years you dang well better be putting new wheel cylinders, shoes, and anything else needed to STOP the darn thing before he ever got a chance to get behind the wheel. Brake parts are not that expensive, hospital bill can be.
Don't know what engine/tranny is in the truck but buying a 73-79 F100 donor with like setup can supply power steering and disc brakes for a better & safer ride.
John
and the Bumpside Forum. Bossman, If you were going to put one of my kids in a 44 year old truck that had been sitting for 7 years you dang well better be putting new wheel cylinders, shoes, and anything else needed to STOP the darn thing before he ever got a chance to get behind the wheel. Brake parts are not that expensive, hospital bill can be.
Don't know what engine/tranny is in the truck but buying a 73-79 F100 donor with like setup can supply power steering and disc brakes for a better & safer ride.
John
Laughing Gas
Joined: Mar 2010
Posts: 1,028
Likes: 5
From: San Francisco East Bay
Meandtheboy Welcome to and the Bumpside Forum.
Bossman, If you were going to put one of my kids in a 44 year old truck that had been sitting for 7 years you dang well better be putting new wheel cylinders, shoes, and anything else needed to STOP the darn thing before he ever got a chance to get behind the wheel. Brake parts are not that expensive, hospital bill can be.
Don't know what engine/tranny is in the truck but buying a 73-79 F100 donor with like setup can supply power steering and disc brakes for a better & safer ride.
John
and the Bumpside Forum. Bossman, If you were going to put one of my kids in a 44 year old truck that had been sitting for 7 years you dang well better be putting new wheel cylinders, shoes, and anything else needed to STOP the darn thing before he ever got a chance to get behind the wheel. Brake parts are not that expensive, hospital bill can be.
Don't know what engine/tranny is in the truck but buying a 73-79 F100 donor with like setup can supply power steering and disc brakes for a better & safer ride.
John
Probably be worthwhile to change all of the rubber parts on the brake lines as well.
Learn how to set the "Proportioning Valve" correctly.
I've tried to explain to my son that trucks don't need to go fast in order to get the job done.
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That is the plan to put new brakes on it just trying to get everything to work. That was why we were trying to get fluid over to the passenger side before, I go putting on the new parts and having to pull them back off. There is no way I would turn my son loose in a truck. That has been sitting seven years without going though everything I am not stupid. I have pulled the lines loose at the wheel cylinder and no fluid. Would it be in the Proportioning Valve? The pedal doesn't go down much when you push it. Thanks for the Welcome.
Laughing Gas
Joined: Mar 2010
Posts: 1,028
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From: San Francisco East Bay
That is the plan to put new brakes on it just trying to get everything to work. That was why we were trying to get fluid over to the passenger side before, I go putting on the new parts and having to pull them back off. There is no way I would turn my son loose in a truck. That has been sitting seven years without going though everything I am not stupid. I have pulled the lines loose at the wheel cylinder and no fluid. Would it be in the Proportioning Valve? The pedal doesn't go down much when you push it. Thanks for the Welcome.
If either well is empty, I'd suspect a leak in one of the lines (probably at a fitting).
If both of the fluid wells are full, it's probably a plugged line.
Post Fiend
Joined: Sep 2006
Posts: 14,325
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From: Island Southeast Alaska
Think on this Bud. I have had more than a few times seen the inside of the rubber flex hose crack in such a way that it will flap over and work like a valve and shut the fluid off. Take the line loose at the first junction before the flex hose and see if fluid comes out.
Man I got a freakin house full all of a sudden. Basically the inside if the flex hose can and will plug off the line completely and nothing will pass through no matter how hard ya try. just a thought. And ya can't see it.
Man I got a freakin house full all of a sudden. Basically the inside if the flex hose can and will plug off the line completely and nothing will pass through no matter how hard ya try. just a thought. And ya can't see it.
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Hotshot
Joined: Mar 2013
Posts: 14,255
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From: Phoenix, Az.
I'd start at the master cylinder and work out. Crack the line going in to the M/C. Have your Son push pedal down to the floor and hold it there 'till ya tighten the line back up. Got flow? If so keep working toward that bad side untill you find where there is no more flow. BTW, I know you want to find the problem 1st, but I agree with all the above. I'm sure you would not do anything unsafe. Please understand, we don't know you yet. And brakes are your/his LIFE! 
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Thanks for the help found the rubber line on the passenger side plugged up. Replaced both of those and the wheel cylinders. Master cylinder seems to be working fine. Now for the back ones and we will be one step closer to rolling down the road. Thanks again!
Lead Driver
Joined: Jan 2011
Posts: 9,858
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From: missouri
yea the old rubber hoses can be tricky sometimes.. i have had them block up completely and also have had them block up in one direction.. the brakes would lock up after being applied.. and not let loose till the bleeder is opened.. so in my opinion it is always best to replace any "old" hoses both frt. and rear...
Laughing Gas
Joined: Mar 2010
Posts: 1,028
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From: San Francisco East Bay
yea the old rubber hoses can be tricky sometimes.. i have had them block up completely and also have had them block up in one direction.. the brakes would lock up after being applied.. and not let loose till the bleeder is opened.. so in my opinion it is always best to replace any "old" hoses both frt. and rear...
The culprit turned out to be the rebuilt M/C.
Last edited by Thipdar; Apr 24, 2014 at 06:12 AM. Reason: fixed a typo
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