STEVE S. - If your #100 is all original, meaning not a conglomeration of several other vintage tractors to make one, it should have the wet internal disk brake. Yes, they can "squeal" under some circumstances. First question is do You have Hy-Tran or some other type of oil in the rearend? Squealing is reduced with Hy-Tran, but can still happen. First thing I'd do is adjust your clutch & brake per the instructions in the 70/100 operator's manual. Most squealing happens when the brake is starting to engage while the clutch is still engaged when pushing the pedal down. Unless you hear metal-on-metal rubbing or squealing when you apply the brakes there's no real urgency to repair the brakes as long as you still have good brakes to stop you on any hill you work on.
The CC wet internal brake is one of the most durable brakes on ANY garden tractor ever built. I'm sure my old #70 still has the 48 yr old factory original brake pucks in it, and just to show-off, when I backed it off the tailgate of my truck 3 weeks ago when I delivered it to SON, I stopped in the middle of the ramps which were at a 40 degree angle. No squeaks, groans, just smooth stopping, and the clutch with my best pair of OEM clutch plates, my best slighty used friction disk, all new springs & T/O bearing works perfectly, driveshaft stops in 1-2 seconds when shifting from neutral into any gear, engagement point is gradual and wide, no slippage or grabbing. Same faultless operation from the 48 yr old brake pads.
If adjusting the brakes and maybe an oil change to fresh Hy-Tran doesn't stop the squealing, new friction pucks should. They're a whopping $12 each (2 required), plus the reduction gear housing gasket is $5.50, and the o-ring to seal the diecast brake piston is only $2.75. Rearend/final drive removal is recommended unless you have the ability to safely tip the tractor's nose up vertically and support it safely, which also allows the old oil to drain more completely. I was able to get about 4-1/2 quarts of Hy-Tran in my #70 by doing that. Engine & battery removal is probably wise if you tip the tractor up too.
Remove the front cover on the reduction housing after removing the brake adjusting bolt & lock nut & driving the pivot shaft for the brake lever out. A ball bearing and a short push rod are behind the brake lever. Pry the brake disk forward & back to allow it to clear the splined end of the lower transmission shaft. The brake piston & frt pad will slide out. Most times the rear pad has to be broken up with a screwdriver or punch and removed in pieces, clean everything well, and install the new parts & reassemble, fill with Hy-Tran, and your good for another 50 yrs.
Ohh, and if you have the engine, driveshaft & clutch out of your CC 100, replace the teaser spring in the clutch too. ($5.00) I rebuilt the clutch in my 72 3-4 yrs ago to replace the T/O bearing & install a stock pressure spring and reused a 2-3 yr old teaser spring and I now have to replace the broken teaser spring. I knew better than that!
The wet internal brake is just another reason why the NF GD CC's are the BEST CC's!
FRANK C. - I know many people swap & trade tractors ALL the time. But IMO, by doing that you miss the best reason for owning a CC. Three weeks ago I passed on Dad's '65 vintage #70 to it's THIRD Generation owner. I've had my #72 for 32-1/2 yrs, and my 982 has been around here for 14 yrs come Labor Day. They're all working tractors, and just knowing that they all are ready, willing, and able to complete ANY job I start with them always brings a smile to my face when I start them up. If I have a problem while using them, it's not because of some hack-job repair a prior owner did. I don't mind spending money to fix them up and repair them at all. I get my value from them by the L-O-N-G trouble-free use I get from them. In the 35 yrs I've had yard work to do, not including the years I lived at home, I've only had FOUR CC's, the 70, 72, 129, & 982. I wonder how many off-topic tractors or Big Box store tractors I'd have worn out in that time. Most of those years I've mowed over 2 acres a week.