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Old 06-28-2019, 02:05 PM   #13
lolife99
67-72 parts collector,…
 
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Join Date: Nov 2002
Location: Mid-MO
Posts: 22,717
Re: Front brake dragging, 83 GMC

Quote:
Originally Posted by Jeepwm69 View Post
I was attempting to interpret how the calipers are listed.


ACDELCO 18R640 {#18035829} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info

FitsFront Left; with 11-5/32in x 2-3/4in Brakes
OrFront Left; Heavy Duty System; w/ 11" X 2" Brakes


ACDELCO 18R639 {#18035828} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info

FitsFront Right; with 11-5/32in x 2-3/4in Brakes
OrFront Right; Heavy Duty System; w/ 11" X 2" Brakes


ACDELCO 18R623 {#18035812, 18R737} Professional; Non-Coated, Includes: Semi-Metallic Pads and Hardware; Reman. Info One of our most popular parts

Front Right; Standard System; w/ 11" X 2" Brakes
The 11x2-3/4 and 11x2 refers to the rear brake shoe size on those vehicles.
Go out to your truck and measure your rotor width first.

Per RockAuto,...
It looks like 18FR623 and 18FR624 are for the light duty 1" rotors.
And 18FR639 and 18FR640 are for the HD 1-1/4" rotors.
__________________
Keith

Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823

Last edited by lolife99; 06-28-2019 at 02:51 PM.
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