Right side brake peddle on 8n ford tractor is locked up

Bad master cylinder? Does the master cylinder have any brake fluid in it? Can you completely remove the bleeder bolt? Do you know how to bleed a master cylinder? I assume the truck has power brakes.

Please check and see if there is a steel brake line from the clutch pedal to the transmission, because I think you might have a "hydraulic" clutch.
This means there is a master cylinder near the clutch pedal and a "slave cylinder" mounted on or near the transmission.
Over time, the slave cylinder can fail, and the tractor will no longer shift for you because the pedal will not release the clutch.
The slave cylinder would need replacement or rebuilt.
God bless your efforts.

gasket not sealing properly you could try to put silicone on the bolt itself let it dry at least 24 hours then try it. you may need a new gasket make sure you tighten them in sequence usually middle right left top bottom to get a flat tightened match

these use by directional braking like the volvos have used for decades.that is the left rear brake works with the right front brake and right rear brake works with the left front brake.this is how the brake lines are connected to work for the braking system.so when you have a brake leak you will have to bleed the opposite brake to get the air out.this maybe your problem also if the abs system has air in it then it will have to be bleed of air.

If it was mine, I would buy a service manual for it. You didn't mention the year but the link below will take you to the eBay listing for them:
Ford 8N manuals

Peddle jumping is your anti lock brakes activating. Rumbling could be anti lock recycling or your brakes are grinding and need replacing

http://www.amazon.com/exec/obidos/ASIN/0872887537/tractordata-20

The adjuster is on the right side just in front of the rear wheel. its the clutch rod / brake rod . you will see a spring on the shaft with two nuts one used to lock the adjustment. loosen the nuts and turn the nuts so the nuts go towards the back of the tractor. keep checking the peddle for brake .

the brake peddle won't work then the pads are probably gone or the brake caliper might be seezed up the braking system is under the right side rear tire check the system if i can further help e-mail me at [email protected] thanks,wade

Hello
Exactly the same problem with my Belarus 562. On my tractor this problems was on the right side of the tractor, there are 2 off brake hubs at the right side (pedal brake and hand brake). Guess that it will be the same problem if it is on the left side of the tractor.
The problem is the innermost brake hub. This part is fitted with 2 off guide/shear pins. These pins shall fit tight to the tractor body holes and to the hub. The hub is made of cast steel and easily cracks around the guide pins.
This makes some slack between the guide pin and the hub. When you engage the brake ti ts in fact these two guide pins that locks the hub from rotation, any slack in the guide pins will be bad, as the hub will rotate/move. This in turn will allow the brake discs to engage at the perimeter, and not only at the sides as they shall do.
By reversing the tractor a little the brakes loosens as the discs rotate the other way and thereby rotating the hub back to its position.
It is also important that the balls in the expansion plates are in good condition as well as the grooves (seat) for the balls.