TW20 Brakes

6620 · Apr 20, 2020

Had a new master cylinder installed on my tw20. Once that was done, the brake pedal was crisp. barley touch it and you were stopped. That was great, until I drove it to my other farm,8 miles away when I slowed down to turn off the blacktop onto the gravel, the right wheel locked up. I backed up and took off in a lower gear and all was fine. Didn't know what caused it. Used it a couple of days. Then when I went to drive it back to the main farm, about a half mile out, I noticed that I hadn't raised my lift arms from the prior attachment. Raised them and both brakes locked up. Put it in a lower gear got it off the road. The brake pedals were stiff as a rock, couldn't budge them. Came back an hour later, brakes were fine and drove it the rest of the way back. Now you have to push the pedals down about a third to get them to grab. Any ideas of what's wrong now? Thanks for your opinions.

juniur · Apr 20, 2020

What fluid did you use in the master cylinder?

Steve@Advance · Apr 20, 2020

Check the pedal adjustment.

The piston in the master cylinder must be able to fully return when the pedal is up.

If the pedal is binding, or the rod is holding the piston in, the bypass hole will be covered and the system will build pressure, binding the brakes.

Also the wrong fluid will swell the cups. Most use brake fluid, but some use mineral oil. You MUST know what type the system requires. The wrong fluid will swell the cups, cause much grief!

Gary H. · Apr 21, 2020

There is adjustment on the rods. Make sure you have free play before the rod hits the plunger.

paul · Apr 21, 2020

TW20 uses mineral oil. Not regular brake fluid.

Paul

6620 · Apr 21, 2020

Mineral oil from Ford dealer. I would bet that they didn't leave enough free play. Thanks for the education.

6620 · Jul 7, 2020

Second verse. I got the dealer to put a new master cylinder on the tractor, bled the brakes. I asked if they set the free play at 1/8 inch, since that is what the tech manual says. The kid said, " No I just eye balled it". I know the kid has been through diesel school (John Deere to be exact). But if the manual says 1/8 inch then we better measure. Don't know if that is what made them go bad this last time or not. A week or so later. I was tilling and used the left brake for a turn. After that it would just go to the floor. No problem, still had the right brake. Well yesterday planting some wheat/beans. Went to back up into a corner. Planter rolled right into the water way. Neither brake worked. Checked the fluid supply, still over full as the kid put it. So now I am wondering, If the plungers are stuck all the way forward, how do we get them back. If I get the dealer to do the work, I think he will need to get me a different mechanic. Any Thoughts (Please)

TW20 Brakes

6620

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juniur

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Steve@Advance

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Gary H.

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paul

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