truck bogs down when brakes are pressed

Discussion in 'Maintenance/Repair' started by Central Scrutinizer, Nov 5, 2011.

  1. Central Scrutinizer

    Central Scrutinizer Member

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    This is driving me nuts! When i press the brake pedal my truck bogs down then revs up. I cant seem to find any vaccuum leaks, i checked for leaks with propane. would this be a syptom of a bad check valve? any ideas?
     
    Central Scrutinizer, Nov 5, 2011
    #1
  3. TRUCK ACTION

    TRUCK ACTION Grand Toyotaholic

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    Only vacuum @ brake system would be @ the power booster.
    I'd check all the hoses & the unit for problems!:cool:
     
    TRUCK ACTION, Nov 5, 2011
    #2
  4. B.Y.E.

    B.Y.E. Toyotaholic

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    Your idle is probably set to high... The surging is the injectors cutting out (ECU thinks truck is slowing to a stop when the brakes are applied). Lower the idle down a bit and it should stay steady. :waytogo:
     
    B.Y.E., Nov 5, 2011
    #3
  5. Central Scrutinizer

    Central Scrutinizer Member

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    BYE, you sir, are the man. truck is running mint!
     
    Central Scrutinizer, Nov 6, 2011
    #4
  6. vancetater

    vancetater Enthusiast

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    Your break vacume booster is bad this has happen to me a few times on my 87 runner and an other one I have currently so replace your booster and will solve the problem deffinatly
     
    vancetater, Nov 6, 2011
    #5

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