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F500 Brake Job

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  #151  
Old 08-08-2018, 09:35 PM
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The Volkswagen diesels and my 300 TD Mercedes use a lot of curved hardened flat washers under many of the engine bolts. They aren't domed like a Bellville washer, but curved like the brim of a cowboy hat. What is the TTT and TTY sequence? Sorry
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  #152  
Old 08-08-2018, 11:12 PM
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The TTT sequence is Torque, Turn, Tighten. A fastener is torqued to a certain value and then turned a predetermined amount of degrees depending on the fastener properties and the application. I think it was originally a German thing, but it's fairly widespread now in heavy equipment.
TTY is Torque, Turn, Yield. Whereas the fastener is drawn up to the maximum elongation or stretch at the threshold of the yield point. This part is rocket science and requires special wrenches that give continuous feedback. I have also seen (but not used) hydraulic tensioners where they pull a stud tight against a surface with so many tons of pressure, and then the nut is just spun on finger tight and the pressure is released.

Sorry about the Back to the brake job.
 
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  #153  
Old 08-09-2018, 09:10 AM
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Once I put the brake shoes and drum back on. How do I adjust? Turn both adjusters until slight rubbing of the drum and then back then off two or three clicks so drum spins free?

When I say “spins free”, I have to spin it. It does not coast with a push.
 
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  #154  
Old 08-09-2018, 01:14 PM
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Originally Posted by HVFDFIREFIGHTER1618 View Post
Once I put the brake shoes and drum back on. How do I adjust? Turn both adjusters until slight rubbing of the drum and then back then off two or three clicks so drum spins free?

When I say “spins free”, I have to spin it. It does not coast with a push.
There is a procedure outlined in the shop manual. You do have one, right?
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Old 08-09-2018, 02:04 PM
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Thanks for the explanation, Bob. I had never heard the terminology before. Volkswagen and Mercedes use a similar procedure to the TTT you described. Volkswagen angle torques their bolts beyond the yield point and they have to be replaced after each use. Mercedes angle torques to just under the yield point and the bolts are reusable. Now back to our regularly scheduled programming.
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  #156  
Old 08-09-2018, 07:31 PM
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I do have a manual.

Got the brake shoes today. Pretty happy with them. 14 rivets in each and bonded!





 
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Old 08-09-2018, 07:52 PM
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Cool. Nice looking job, but it doesn't look like they were arced. Does that brake arrangement not have primary and secondary shoes?
 
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  #158  
Old 08-11-2018, 08:07 AM
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There are two square head nuts on the pumpkin. I am assuming the lower is the drain and the upper is the fill? Book says capacity of 13 1/2 pints of hypoid or multipurpose sae 80.


 
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Old 08-11-2018, 08:13 AM
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Brake line block. Are the three threads all the same size? The two side look like fine thread. The top (a hose coming from Lon line from master) looks to be made regular thread?

1/4 “ od lines.
Master to back bracket is 113”
bracket to block (this is a hose) 18.5”
block to driver side is 21.5”
block to passenger side is 39.5”


 
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Old 08-11-2018, 12:42 PM
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Originally Posted by HVFDFIREFIGHTER1618 View Post
There are two square head nuts on the pumpkin. I am assuming the lower is the drain and the upper is the fill? Book says capacity of 13 1/2 pints of hypoid or multipurpose sae 80.


That is a jacking bolt. It doesn't go through.
 
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  #161  
Old 08-11-2018, 04:27 PM
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When I put this on the back side of the lower wheel cylinder, does the hole in the bolt need to face up towards the brake fluid inlet?


 
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Old 08-11-2018, 05:28 PM
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Originally Posted by HVFDFIREFIGHTER1618 View Post
There are two square head nuts on the pumpkin. I am assuming the lower is the drain and the upper is the fill? Book says capacity of 13 1/2 pints of hypoid or multipurpose sae 80.
This is the Drain/Fill port. the old fluid will have to be sucked out


 
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Old 08-11-2018, 06:34 PM
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Ok, look at the two components carefully and then think about it for a moment. Notice that the hole in the bolt goes into the wheel cylinder, and that the bolt is necked down around the hole. Where would any fluid go? Don't forget that two copper washers are required.

Originally Posted by HVFDFIREFIGHTER1618 View Post
When I put this on the back side of the lower wheel cylinder, does the hole in the bolt need to face up towards the brake fluid inlet?


 
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  #164  
Old 08-11-2018, 07:40 PM
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Maybe I don’t have the right manual. This is the one I have. It’s a small book like a quarter page. I do have a parts manual also. The shop manual doesn’t say a lot as to R&R.


 
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  #165  
Old 08-11-2018, 07:44 PM
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I got the new brake lines on and the shoes. Question? How tight should the castle nut be that holds the shoe one? I have new cutter pins for them but did not bend yet because I am unsure how tight the nit needs to be. I have not put fluid in the lines yet. Went to two stores and they did. It have a bleeder. Guess I will make my own out of a 2 liter bottle and some hose.
I did get heavy duty brake.



 
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