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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Brake Master Question

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Old May 31, 2020 | 06:59 AM
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Brake Master Question

Good morning gents. Does anyone know offhand on the brake master cylinder for a 72 f250 two wheel drive if the front portion of the cylinder goes to the front or rear of the vehicle. I am losing some fluid out of there and no lines seem to be leaking so I am guessing wheel cylinders from sitting. Any help is appreciated.
 
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Old May 31, 2020 | 10:40 AM
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On my 70 f250 I have disc front rear drums. The rear part of the M/C, which is the larger portion, is for the front brakes. The front, or smaller portion, is for the rear drums. Do you have disc front?
On my 72 f250 4x4 with all drums it is the same. The larger portion for the front and smaller for the rear.
 
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Old May 31, 2020 | 03:07 PM
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Also, Ford did have a problem with the cover gasket leaking. And, if with disc brakes the brake fluid will go down as the pads wear.
 
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Old May 31, 2020 | 04:45 PM
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It is probably your master cyl that is leaking internally bypassing the piston.
 
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Old Jun 1, 2020 | 06:52 AM
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My 71' F250 has the same. Front Disc and rear drums with the master cylinder cap leaking some. I have checked the lines and the power booster for any hints of leaks and found nothing. Supposedly the caps and rubber are known for constant seepage.
 
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Old Jun 1, 2020 | 11:28 AM
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I was able to get the leak sorted out. I have drums all the way around and the front portion of the master was for the rears. The culprit of the leak was the rear driver side wheel cylinder. I was also in for quite a surprise when I had to remove the entire axle in order to remove the drum, which fought me valiantly. I then took the truck for its first trip on the road in over 5 years. It was quite a momentous moment. I have been working every weekend on this thing for the last month+ to just get it worthy to go get gas under its own power.




 
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Old Jun 1, 2020 | 11:36 AM
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That's good news. Where are you in VA? I'm between Stuart and Martinsville. Lots of 67-72's down here. We also have a Virginia Chapter.
 
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Old Jun 1, 2020 | 01:08 PM
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Originally Posted by GLR
That's good news. Where are you in VA? I'm between Stuart and Martinsville. Lots of 67-72's down here. We also have a Virginia Chapter.
I am in Roanoke but the truck is kept in Buchanan (about 30-45 mins north of Roanoke).
 
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Old Jun 1, 2020 | 03:36 PM
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The junction of 581 and I81 is about 75 miles from our house.
 
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Old Jun 2, 2020 | 10:53 AM
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Originally Posted by 72Longboy
get gas under its own power.
Congratulations. That's a great feeling when all that work pays off.
Truck looks good there getting a sip of go juice.
So what's the project for THIS weekend? Never ends, right?
 
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Old Jun 2, 2020 | 11:09 AM
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Gas is about 40 cents higher up there than down here
But, as mentioned it's a good feeling when it's "on the road again"
 
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Old Jun 2, 2020 | 12:09 PM
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On a dual drum/disk master, the larger reservoir will be the drum circuit.
 
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Old Jun 3, 2020 | 09:58 AM
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Originally Posted by jsc83
Congratulations. That's a great feeling when all that work pays off.
Truck looks good there getting a sip of go juice.
So what's the project for THIS weekend? Never ends, right?
The project for this weekend is to try to tighten up the manual steering box. It will turn a good 1/4 to 1/2 a turn in either direction before it actually directs the truck. At this point the steering wheel is just for looks. It was quite terrifying driving down a one lane back road. I might also crawl back under the truck to see what is up the the shifter since it moves a great degree side to side while in gear. Also, the gas price is so high because that station was right off the interstate in kind of a dead zone.
 
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Old Jun 3, 2020 | 12:11 PM
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When you tighten the box up make sure both front wheels are of the ground.
 
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Old Jun 3, 2020 | 12:17 PM
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And pointed straight ahead.

Also don't forget to check for worn/loose tie rod ends, drag link etc.
Seized or tight king pins will also cause wandering even when everything else is good
 
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