Brake problem on 2500hd

Discussion in 'Trucks and Trailers' started by QuadRacer041, Feb 12, 2010.

  1. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Posts: 364

    I have an 06 2500hd crew cab. Lately I've noticed that when I hit the brake the pedal it feels spongey right before the truck comes to a stop, real low wheel speed.What could that be? Air getting in the system somehow? I haven't had any service on the brakes done recently, I dont know how it could have started. Any ideas? I talked to a buddy of mine who is a mechanic at a dealership (not chevy though) and said that he thinks it could be an ABS sensor going bad. After he said that it kinda make sense because the action I get from the brake pedal when it happens feels like the abs is kickin in.
    Any info would be greatly appreciated.
     
  2. unkownfl

    unkownfl LawnSite Gold Member
    Posts: 3,838

    To me when I feel the ABS kick in it pushes the pedal back towards me so it doesn't feel sponge in my opinion of ABS. Sounds like the master cylinder is allowing fluid to bypass the plunger. With the truck stopped while the engine is running hold the pedal down and see if it continues to go to the floor with steady pressure.
     
  3. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Posts: 364

    ok, maybe spongey isnt the correct word i should have used. The pedal kicks back at me yes....same feeling you get when the abs hits.
     
  4. Alpha Property

    Alpha Property LawnSite Senior Member
    Posts: 409

    i pulled my ABS fuse.... best thing i could have done, i was having the same kind of problem pulling into parking spots
     
  5. Alpha Property

    Alpha Property LawnSite Senior Member
    Posts: 409

    the only way to fix this other than just pulling the fuse and scrapping ABS all together is to replace both front wheel barrings. The problem is the ABS sensor is inside of the hub/barring assembly and as they start to wear, not get worn out, just wear, the grease starts to come out of the barring pack and gets flung all over the inside of the hub and lands on the sensor for the ABS.... and theres no way to take the sensors out of the hub, you just have to replace the assembly
     
  6. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Posts: 364

    So if I pull the abs fuse it will stock that brake pedal action?
     
  7. Alpha Property

    Alpha Property LawnSite Senior Member
    Posts: 409

    yea, it will act normal, just no ABS, the only real downside is your ABS light and your parking brake light will come on on the dash.... but they eventualy burn out lol
     
  8. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Posts: 364

    Is there any I can make a paperclip jumper to make the abs light flash to get any codes?
     
  9. Alpha Property

    Alpha Property LawnSite Senior Member
    Posts: 409

    as far as i know no there isnt, the ABS system is still working as its designed to do, its just the sensor in the hub is covered in grease and isn't taking an accurate reading at low speeds, and low speeds while turning
     
  10. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Posts: 364

    I didn't think grease would affect how the magnits worked? Can it be cleaned?
     

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