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01-23-2023, 12:59 PM | #1 |
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Join Date: Oct 2022
Location: Edmond, OK
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Brake rod straightness
Rebuilding brake system to get the 30 coupe road worthy. Just rebuilt cross shaft and all brakes at the wheels. Reinstalling the rods soon and noted several have minor curves or minor bends. Are the rods suppose to be true straight?
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01-23-2023, 01:05 PM | #2 |
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Re: Brake rod straightness
From what I understand yes, they need to be true and straight. I just did the 4 on my 29 Fordor. They aren't that expensive, I got mine I believe from Synders.
Dave |
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01-23-2023, 01:47 PM | #3 |
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Re: Brake rod straightness
One of the differences between mechanical and hydraulic brakes is equal application pressure at all four wheels, hydraulics equalize on application with proper shoe adjustment, the mechanicals rely on a proper foundation, the mechanical linkage needs to be true, and proper shoe adjustment. Bent or curved rods will ‘absorb’ application pressure,giving poor equalization and function.
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01-23-2023, 02:20 PM | #4 |
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Re: Brake rod straightness
Use original rods where you can. In the past (10-15 years), repo rods would stretch …may be better now??
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01-23-2023, 05:12 PM | #5 |
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Re: Brake rod straightness
Replace the rods and any other connecting parts.
This is one place you don’t want to be cheap! Enjoy. |
01-23-2023, 05:32 PM | #6 |
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Re: Brake rod straightness
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01-23-2023, 07:03 PM | #7 |
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Re: Brake rod straightness
Use a vise, they can be made straight very easily.
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01-23-2023, 10:04 PM | #8 |
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Location: Edmond, OK
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Re: Brake rod straightness
I applied some heat and straighten them all this afternoon. Used a long metal ruler as straight edge. Most off 1/4-1/2” Bend. Vehicle had some weird springs and home wire attaching them, probably the reason some got bent. Feel good about them now. Let them cool, sanded and painted.
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01-24-2023, 08:40 AM | #9 | |
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Re: Brake rod straightness
Quote:
Going from the original "equalization" system (Ford went out of his way to have equal pressure on all four brake shoes on the early split cross shaft cars) to the more modern "solid center cross shaft" Ford "gave up" some of that equalization. Stretching of the rods/torsion of the cross shaft gives an "approximation" of the equalization theoretically possible. I.e. there is a certain "spring" made into the system by its design. An equivalency for hydraulic systems would be "air bubbles." AND Given that the Ford brakes are "manually" adjusted at each wheel anyway, and by their nature and human estimation "more or less" equally adjusted, the approximation was thought "good enough." I guess I would say a "minor" bend is fine. In your adjusting you manually compensate for that anyway. But straight is where you start. The first tree branch you run over will have other ideas. Joe K
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Shudda kept the horse. Last edited by Joe K; 01-24-2023 at 08:45 AM. |
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01-24-2023, 08:57 AM | #10 |
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Re: Brake rod straightness
And, as to original versus repop parts - the jury is favoring new parts, but not always.
A rather severe accident occurring as a result of the "center link" breaking at what appeared to be a weld at the "eye" caused the Service Brakes to fail - all four wheels. This is Snyder's picture for that particular rod - but it doesn't match the pix in my mind's eye. The issues seemed to be to be not properly made, the swelling for eye originally done by "upset" and the repop being an "applied weld." Joe K
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Shudda kept the horse. Last edited by Joe K; 01-24-2023 at 09:04 AM. |
01-24-2023, 11:08 AM | #11 |
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Re: Brake rod straightness
I have had a front reproduction brake clevis snap completely in half when stopping . It sounded just like a rifle shot . It happened to be made from cast Iron!! It should have been made from forged iron . This might have been a older reproduction part because I haven't seen any more like this in quite awhile . You might check your spare parts collection for some of these clevis.
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01-24-2023, 12:35 PM | #12 |
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Re: Brake rod straightness
Brian, are the weird springs the anti-rattle springs?
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01-24-2023, 03:52 PM | #13 |
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Location: Edmond, OK
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Re: Brake rod straightness
No it’s a random spring and baling wire. Home made repair I’m sure of it. One of the pins was installed in the wrong opening on the Clevis end too.
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