JB7, JD7, or JB8

[coachdtierney54]

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[coachdtierney54]

These are my front brakes I think I bit off more than I can chew...

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[CSFJ]

looks as though the brake pad is doing a little home machine work on that rotor. A decent manual should walk you through removal and reinstall, the only catch is those things are ungodly heavy.

 

[coachdtierney54]

So new rotors are needed?

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[CSFJ]

Depends on how long it's been grinding. These old trucks came with a lot of meat on those rotors, but without taking a mic to it to get a proper measurement, you can't say. first step in either situation though, will be to get the hub off.

 

[coachdtierney54]

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[coachdtierney54]

Is this enough? Sorry but I'm very new to this...

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[CSFJ]

A tape isn't going to be accurate enough. most of the service limits are measured in the hundredth, or thousandth of an inch. You'd need to get a micrometer on it to get a real measurement from the thinnest points of the rotor, or take the rotor to where you'd have it turned and let them measure it.

 

[coachdtierney54]

Gotcha. Thanks for the info. After pricing these, I hope they can be saved. Even rockauto had them for about $100 each...

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[coachdtierney54]

What tools do I need to remove it?

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[CSFJ]

you're going to need to get a service manual for your truck. I don't have anything here that covers the c30 front brakes, and most videos on line seem to cover the k30 fronts. I've never played with the dually trucks, so I don't have a definitive answer on what you'll need, I can only guess and make assumptions based on other stuff I've worked on.

 

[chengny]

Rotor thickness specs (as new, minimum machinable, and discard) for the various JB classes:

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[chengny]

Gotcha. Thanks for the info. After pricing these, I hope they can be saved. Even rockauto had them for about $100 each...

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See the post directly above for the thickness below which they cannot be machined. Also the minimum thickness for machining should be stamped somewhere on the rotor.

 

[chengny]

What tools do I need to remove it?

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Below is some info on 1985 C30 front brake maintenance. I hope they are legible.


Caliper R & R and brake pad renewal:

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Rotor R & R:

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