Quote:
Originally Posted by MikeB
BTW, I think standard brake codes are JB1 or JB3. HD brakes are JB5, JD3, or JD5. If you still have your glove box sticker, it should tell you which brakes the factory installed on your truck.
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JB1 is manual brakes.
JB3 is the lightest power system, and has the 1" rotors.
JB5 and above has the 1.25" rotors.
We built so few with the 1" rotors that I usually assume the person has the 1.25" version - and I'm usually right.
Here is the brake release chart for an '87, as an example:
http://67-72chevytrucks.com/vboard/s...d.php?t=510519
