Posted by wore out on October 10, 2019 at 09:08:06 from (64.255.159.199):
In Reply to: C-65 Brakes posted by MF165FARMER on October 10, 2019 at 08:48:32:
Quoting Removed, click Modern View to see
First off, if you need to pump the brakes 3 times to get brakes, first bleed EVERYTHING, then set up all the brakes, 'cause it's certainly unsafe to drive that way!
If you have a wheel cylinder leaking, the brake backing plate on that wheel will be wet and/or stained from the leaked fluid.
If no sign of that and the truck has a frame-mounted brake booster ("Hydrovac"), likely it's leaking internally and the brake fluid is being sucked into the engine intake manifold and burned.
If you have been working with it lately and it's been losing fluid that way, there should be signs of brake fluid in the vacuum hose from the hydrovac to the intake manifold. If you need to replace it, and are lucky, there will be a steel tag dangling from the bolt in the big clamp that holds the diaphragm area together, this is the number you need to order one.
If you need to deal with a wheel cylinder the only way to figure out what you need is to get it apart and check for casting numbers on the cylinder and measure it's bore diameter, as even cylinders with the same casting numbers may have different bore sizes.
Not only is it likely that wheel cylinders are different between C60 and C65, there are many, many possible differences within the same series, depending upon what axles and brakes were originally "spec'ed" on your specific truck.
GOOD LUCK, and hope you have a big checkbook, getting into the brakes on an old medium-duty truck is typically NOT cheap!
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