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EFV-8 Club Forum / General Ford Discussion / Brake pad length

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Discussion Topic: Brake pad length -- page: 1 2

supereal

03-21-2010 @ 10:48 AM

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The early hydraulic brakes were "Lockheed". The later, '49 and up, are "Bendix" type.

Pauls39

03-19-2010 @ 6:20 PM

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Your 39 brakes are not truely self energizing like the later Ford brakes. The larger pad on the forward shoe does much of the braking when you are going forward.
Sound like your brake guy dosen't understand these brakes. I would recommend using the original type of shoes, larger pad forward smaller pad on the opposite shoe.

supereal

03-19-2010 @ 12:11 PM

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The long/short configuation was used thru 1948. As Ford didn't use hydraulic brakes until 1939, I don't know why "earlier models" would apply. I'm not a brake engineer, but brakes should be applied evenly, not grab. As the system pressure increased, it is fair to assume that the secondary (short) shoe would come into play. One of the main drawbacks of drum brakes is "fade", caused by heat. It follows that longer lining create less heat than short one due to differences in surface area.

Steve S

03-19-2010 @ 11:33 AM

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That makes sense, and I just called my lining shop about it. He tells me that earlier models used the long/short configuration and that my '39 should have them all the same length. I don't have a clue if he's right or not.

Perhaps I'm mistaken in my thinking, but a shorter pad may grab harder since it's the same pressure being applied but over a smaller surface area?

jerry.grayson

03-19-2010 @ 10:44 AM

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The secondary shoe does not matter much, but the primary shoe does most of the braking and I would want it to be as long as possible. It sounds like your parts guy does not understand how early Ford brakes work.

supereal

03-19-2010 @ 7:38 AM

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Standard diameter is 12". The "book" says not to turn them more than .060

Steve S

03-18-2010 @ 10:12 AM

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I don't have any point of reference, as this is my first truck of this type! It will be some time before it's running anyway...

On a related note, does anyone know how far the brake drums can be turned? I can't find it in any manual.

supereal

03-18-2010 @ 9:56 AM

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I wouldn't worry too much. As said, the composition of the linings is most important. If you find that the braking is poor, I'd change them. Most of us don't drive our cars at high speeds. If you do, I'd practice a few panic stops just to be sure you can do it if necessary.

Steve S

03-18-2010 @ 9:38 AM

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Thanks, that makes sense. Assuming the pad material is correct, should I be concerned with the four identical pads?

supereal

03-18-2010 @ 8:57 AM

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The brakes have a long (primary) shoe toward the front, and a short (reverse) show facing to the rear. We often find them reversed. The configuration is to put the maximum force of braking onto the anchor, not the wheel cylinder. Be wary of "one size fits all" linings, as they are often made of very hard materials that reduce braking power. When asbestos was banned from brake linings and clutch facings, the substitute materials often were inferior. Mechanical brakes suffered the most when woven linings became scarce.

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