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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Brake questions.

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Old May 25, 2010 | 10:21 PM
  #1  
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Brake questions.

Does anyone know the minimum thickness that the rotors and drums on a 85 F150 can be turned to? I have to knock them off to change pads and shoes and doubt they have ever been turned so I was going to chuck them up and turn them. I realise that it is supposed to be stamped into the steel but the pitting is pretty bad after 25 years.

Thanks.
 
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Old May 26, 2010 | 12:30 AM
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F150 2wd

Max drum diameter prior to machining 11.090 inches.

Drum discard diameter 11.120 inches

Drum nominal diameter 11.030 inches

Front disc minimum thickness before machining 1.150 inches

Front disc discard thickness 1.120 inches

Front disc nominal thickness 1.185 inches
 
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Old May 26, 2010 | 06:28 AM
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I should have mentioned that it is a 4WD. My bad.
 
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Old May 26, 2010 | 07:48 AM
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The minimum thickness should be stamped on the rotors and drums.
 
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Old May 26, 2010 | 09:23 AM
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Or cast into them.

-Enjoy
fh : )_~
 
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Old May 26, 2010 | 09:26 PM
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I think I mentioned that they are illegible due to pitting.
 
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Old May 26, 2010 | 10:33 PM
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Originally Posted by flipklos
I think I mentioned that they are illegible due to pitting.
You must be assuming that anyone else actually read that far into your post......
Sorry, I don't know the exact specs for the 4x4 front rotors, but I'd bet they are very similar to the 2wd, since the pads/calipers are the same. Rear drums would be the same, as the are the same parts.
 
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Old May 26, 2010 | 10:48 PM
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Originally Posted by Franklin2
F150 2wd

Max drum diameter prior to machining 11.090 inches.

Drum discard diameter 11.120 inches

Drum nominal diameter 11.030 inches

Front disc minimum thickness before machining 1.150 inches

Front disc discard thickness 1.120 inches

Front disc nominal thickness 1.185 inches
I checked, 4wd is the same.
 
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Old May 27, 2010 | 06:29 AM
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Thanks, I will mic them up.
 
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Old Jun 6, 2010 | 09:59 PM
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Rotors were shot. One side had pads worn at an angle. Replaced rotors and pads.
Drums looked ok. No adjuster cable though. Installed adjuster cables and now have very, very good brakes.

Thanks for the help yall.
 
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