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JB6 Brake System what is this?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mudstud, Jan 22, 2003.

  1. Mudstud

    Mudstud 1/2 ton status

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    On a 14 bolt ff what is JB6 Brake System? It lists this in the parts book for brake shoes. What is it?
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    That's the option code for the brake system.

    If I remember correctly the JB6 is a non-hydraboost system with the 13" shoes.
     
  3. morphed86k10

    morphed86k10 1/2 ton status

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    I thought hydroboost just dealt with the power steering pump and brake master cylinder?
     
  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    The hydraboost system replaces a vacuum booster on a 1 ton or diesel application. It provides the power assist via hydraulics for the brakes, it uses the p/s pump to provide the hydraulic pressure.

    The JB6 code is a GM option code for a combination of parts: **I think** vacuum assist booster, larger master cylinder and 13" rear drum brakes. The JB8 code is for the hydraboost system with 13" rear drum brakes.

    Here is a break down of the brake option codes (unfortunately the descriptions are a little vague):

    JB1 : BRAKE, MANUAL, DISC/DRUM, 4300 LBS
    JB3 : BRAKE, POWER, DISC/DRUM, 4600 LBS
    JB5 : BRAKE, POWER, DISC/DRUM, 6400 LBS
    JB6 : BRAKE, POWER, DISC, DRUM 7200 LBS
    JB7 : BRAKE, POWER, DISC, DRUM 8400 L85
    JB8 : BRAKE, POWER, DISC, DRUM 10000 LBS
     
  5. Mudstud

    Mudstud 1/2 ton status

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    Thanks for the info.
     

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