Posted by Janicholson on March 16, 2011 at 19:47:26 from (67.72.98.45):
In Reply to: Break on a Super H posted by Farmallman2010 on March 16, 2011 at 17:29:43:
If one is way more sensitive than the other, it may be beacuse the brakes wear in a way that causes them to over react to their servo action. They are designed to self energize. when the disk expander is moved by the linkages, the motion of the disks helps drag the plates farther apart. This assists in braking effort with less pedal pressure. If the balls are rusty, or the ramps they run in have grooves, or the friction material is too thin, or there is sticky grease or glaze on the disks, the problem will occur. The total stack height clearance should be about .050 to .080" measuring the disks and plate, then comparing that total to the housing space between the tractor friction surface, and the housing surface. (and adjusters on the rod not pre pulling the expander)
New friction disks may not provide this reduced clearance due to wear on the housing and plates and brake cover. (Worn steel surfaces)
If this is the case, the housing can be machined thinner at its inner contact surface to bring the stack into proximity.
Non-directional sanding of components with 250 grit paper will help when putting them together.
A skiff of silver anti-seize compound on the balls and ramps works for me. Others believe they should be dry, others use a bit of graphite and a tiny bit of grease to hold the graphite on the balls and ramps. Do not lube them liberally.
Leaky shaft seals are also a problem, and if leaking must be replaced.13:17:00 67.72.98.45
The measurement from the mating surface of the housing casting (where it attaches to the tractor) to friction surface down in its depths is important.
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