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You have to measure the inside diameter of the drum.
Disk brakes should appear as shiny plates with the calipers on top and in full view. Drum brakes will appear as a 'bowl' which make telling them apart instant.
Contact a Massey Ferguson dealer tell them your Model and Serial number. By giving the dealer S/N they can tell you everything about the tractor including engine, horse power and any accessories that came on the tractor from the manufacture. The dealer will probably be able to tell you anything about add-ons by previous owner(s). WIth the S/N they can also tell what wiring bundle was installed on your tractor
Rear brakes do not have to be replaced too often. It's really hard to tell without looking at it. What you can do is to replace front brakes and test drive it, if you feel that your car brakes works just fine you do not need to replace rear brake shoes.
If you can see the brake caliper and rotor, then it has disc brakes. If all you see is a large drum then it has shoes. If you can see the front brakes thru the wheels, you can identify disc brakes. If the rear look like the front, then they are also disc brakes. However if the rear look much different, then chances are they are drum.
Impossible to answer unless you tell us name and year of vehicle. -They are NOT all the same !
I have a Massey 50. It is really hard to tell you over the computer how to adjust it. I went to Tractor Supply Co. and ordered a service manual from them for like 32 dollars. It has exploded views, and really defined directions on how to do it. After reading it and seeing the pictures on what they want you to do, it's pretty easy.
You may want to take your car to a shop for it to be looked at and maby they can tell you after it has been checked.
you should tell them to be a brain surgeon
The DX and LX models with the 4 cylinder engine have front disc and rear drum brakes. The LX and EX models with the V6 engine have four wheel disc brakes. You can tell these cars at a glance by their five lug wheel hubs and dual exhaust pipes. The 4 cylinder EX models come with front disc and rear drum brakes standard, but if they are equipped with antilock brakes (ABS) then they come with four wheel disc brakes.
The drum brakes are in the rear of most passenger cars and trucks, disc brakes are typically on the front of the vehicle. It is also the most widely used brake than any other brake style.
4 wheel ABS brakes are standard on the Mercury Mountaineer in 1999