09-03-2021, 01:08 PM
When you checked temps on front :
Was that the temp at the brake drum , or wheel itself ?
Were you doing stop and go , like in urban area ?
Also , you mentioned the shop adjusted " shackles " ? Not sure about the brakes on the 1980 , but ours has Rockwell / Meritor brakes which have slack adjusters for the "S cams " which move the brake shoes . Cool truck guys refer to them as "slacks" . When these are adjusted properly there is no contact between shoes and brake drum ( no brake applied on front ) provided the drum isn't out of round .
After replacing front brake drums , shoes , wheel bearings , etc , I drove about 20 miles on the Interstate . Light braking only on exit ramp with Jake , checked temp , +- 100 . I was mostly checking to make sure the new bearings were set correctly , not building heat . Hub , drum , wheel were all close to the same . Return trip with a little more braking , I saw about 115 degrees . Point being , wheels won't heat up a lot with light or no braking , just the heat generated by the tires .
I have a new TPMS , but only about 30 miles experience with it so far .
Anyway , if you could jack up one front wheel at a time , see if it turns freely .
That would tell you a lot .
Was that the temp at the brake drum , or wheel itself ?
Were you doing stop and go , like in urban area ?
Also , you mentioned the shop adjusted " shackles " ? Not sure about the brakes on the 1980 , but ours has Rockwell / Meritor brakes which have slack adjusters for the "S cams " which move the brake shoes . Cool truck guys refer to them as "slacks" . When these are adjusted properly there is no contact between shoes and brake drum ( no brake applied on front ) provided the drum isn't out of round .
After replacing front brake drums , shoes , wheel bearings , etc , I drove about 20 miles on the Interstate . Light braking only on exit ramp with Jake , checked temp , +- 100 . I was mostly checking to make sure the new bearings were set correctly , not building heat . Hub , drum , wheel were all close to the same . Return trip with a little more braking , I saw about 115 degrees . Point being , wheels won't heat up a lot with light or no braking , just the heat generated by the tires .
I have a new TPMS , but only about 30 miles experience with it so far .
Anyway , if you could jack up one front wheel at a time , see if it turns freely .
That would tell you a lot .
1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed
Chris and Sharon Hand