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Farmall & IHC Tractors Discussion Forum
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Brakes on 450

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OldFarmall450

04-24-2016 09:29:52




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Like I said earlier, the brakes on my 450 are in poor condition. Not having a manual, yet, could someone walk me thru adjusting them and/or replacement? I don't want to start turning screws and not know what I'm doing. Again, I'm fairly mechanically inclined, (please overlook my trying to pull start a locked up motor), just looking for advise.

Thanks




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jim_uny

04-24-2016 17:18:13




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
just did my farmall 400 which is similiar to 450. make sure that inner axle seal is NOT leaking at all. this oil will cause brake disc pads to gum up and not stop.



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jim_uny

04-24-2016 17:17:54




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
just did my farmall 400 which is similiar to 450. make sure that inner seal is NOT leaking at all. this oil will cause brake disc pads to gum up and not stop.



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OldFarmall450

04-24-2016 13:04:41




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
Jim, thanks for the detailed information...sounds about like changing brake pads on my truck!!!! :lol:
Seriously though, that's a ton of info...no wonder the tractor mechanic charges so much! My head hurts from just reading your reply. I just THOUGHT I was mechanically inclined...

Again, thanks everyone.



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OldFarmall450

04-24-2016 12:57:10




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
old, I tried to send you a pm, but got a msg saying they are disabled...idk what that's about..mebbe a moderator can help me there.

anyway, feel free to email me at eterry8779@sbcglobal.net



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old

04-24-2016 14:40:49




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 12:57:10  
If you use classic in the bottom right corner of the box you will see a place that says send e-mail just click on it. If you use modern just click on my handle and it will do the same thing



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Janicholson

04-24-2016 10:08:14




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
Farmall middle years disk brakes are somewhat painful if not messed with every year. The disks look OK even when worn. the housing and inside wear surface are also prone to wear, as well as the expander that actuates the system. There are two disks that are splined to the differential pinion shafts. These turn far mor rapidly than the rear axles. The system works by a link from the pedal pulling on two linkages that rotate a pair of flat plates on opposite directions. The plates have three steel balls placed between them on opposing grooved ramps. As the plates rotate, the balls ride up the ramps and wedge the plates apart. This smashes the friction disks between the plate and tractor on the inside disk, and between the plate and housing on the outside disk. The expander allows one of the two plates to be held against a stop. The other turns in the direction of rotation, and is assisted in this movement by the friction (this causes a self energizing "servo" action that reduces pedal effort dramatically) The servo action happens in the opposite direction when backing up.
The wear usually found is great enough that the angle of pull of the links is wrong and excess pressure on the pedal is near worthless. To actually repair the brakes, it is necessary to compensate for the wear by machining the mating edge of the housing to remove the excess clearance. New disks can limit the amount removed, but the end result must be a total clearance on the M through 450 tractors of between .030 and .045". this can be measured by placing all the components correctly into the housing (flat on the bench) and measuring from the mating surface to the inside of the inner disk. Make sure the components are centered to assure stack height is as short as possible. Much more than .060" and it will have low performing brakes. Springs and pivots need to be looked at and replaced as worn. Don't use oil or grease on the components. Clean and sand the ball tracks (no dips or dents are allowed, and really condemn the plate if found) The balls can have surface rust (cleaned up with 400 paper) but no pits or deformities. Tri Flow or other PTFE dry lube on the balls and links is OK. Adjust pedal pull rod length to allow about 2.5 inches of pedal travel where your foot pushes. and that both are very close to the same adjustment. Jim

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GordoSD

04-25-2016 13:11:54




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 Re: Brakes on 450 in reply to Janicholson, 04-24-2016 10:08:14  
Jim. What is the measurement for the Super H disc brakes, and brand new discs? I have done a number of disc brake rebuilds and plane .060 off the drum for a starting point.



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Janicholson

04-25-2016 20:08:05




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 Re: Brakes on 450 in reply to GordoSD, 04-25-2016 13:11:54  
slightly less, .028 to .040 works. Jim



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old

04-24-2016 09:54:25




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 Re: Brakes on 450 in reply to OldFarmall450, 04-24-2016 09:29:52  
Send me an e-mail and I'll scan that page in my manual for you. Not real hard to work on and on most I have found that the brakes do not work well because the balls between the pads get stuck and rusty.



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cornerpost

04-24-2016 17:39:42




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 Re: Brakes on 450 in reply to old, 04-24-2016 09:54:25  
What old said about getting rust off the balls so they can smoothly roll and expand plates against discs. Here it's pretty flat so rust more an enemy than wear.



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