Posted by Skyhighballoon(MO) on October 10, 2019 at 14:45:55 from (135.245.48.76):
In Reply to: C-65 Brakes posted by MF165FARMER on October 10, 2019 at 08:48:32:
I bought a 75 C65 grain truck a few years ago and had to go through the brakes. I replaced the master cylinder, hydrovac unit under the cab and both wheel cylinders in the left front and right rear wheels. I got all my parts from Napa but you might find some online if you know part numbers.
Not only do you have to bleed it well starting at the master cylinder, then at the hydro unit then at each wheel, you also need to jack up each wheel and turn the little star adjusters to get the shoes as close as you can to the drums w/o dragging. This reduces the amount of fluid the master cylinder has to push to get braking action. I have brakes on the first push but it's close to the floor even after fixing and adjusting. 2nd pump I have a full firm pedal.
The standard master cylinder has a 1.5" piston if I remember right. I remember looking around on Rock Auto and finding an optional master cylinder with a 1.75" piston that looked like it would fit. That larger piston would move more fluid when pushed the pedal and might help eliminate some of the pumping.
I also have a 74 C60 and it doesn't have the same mushy pedal issue...go figure...I just think think there is enough give in all the tolerences in the system that it takes a LOT of adjustment to get really good brakes on these old trucks...some harder to get than others.
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