Brakes and clutch adjustment.

Discussion in 'Peterbilt Forum' started by ralin10, Jul 27, 2014.

  1. ralin10

    ralin10 Bobtail Member

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    Apr 24, 2014
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    Hello everyone, can you guys explain how to adjust the brakes and clutch on a Peterbilt 2005 378 model.
     
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  3. Powder Joints

    Powder Joints Subjective Prognosticator

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    Sep 25, 2007
    Rosamond, SoCal
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    You do not adjust the clutch.

    If it needs it you need your shop to adjust it.
     
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  4. aplustrucking

    aplustrucking Bobtail Member

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    Nov 19, 2014
    Sayre, Oklahoma
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    With your brakes release brakes chock the wheels tighten slack adjusters all the way back off 1/4 turn. The clutch you need to remove the inspection plate on the bottom of the trans, there will be an adjustment bolt, may have to turn the motor to get to it. Have some one depress the clutch and adjust counterclockwise to desired clutch feel.
     
  5. tmslogistics

    tmslogistics Light Load Member

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    Mar 10, 2015
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    Unable to turn clutch adjustment bolt. Any pointers? I've had it explained to me, but my first time to do the adjustment myself.

    Thanks in advance for your help.
     
  6. Longhood379

    Longhood379 Medium Load Member

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    Nov 30, 2009
    Cremona AB
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    there should be some type of lock, either a plate with a bolt or you have to push the adjusting bolt in, as mentioned the clutch pedal has to be depressed to turn the pressure ring (via the adjusting bolt) the recommended procedure is to set the linkage so that the clutch brake is tight with the pedal just off the floor, then set the pressure ring to give 1/2 to 9/16 space between the release bearing brake surface and the brake disc. this should give you at least 1 1/2" of pedal free travel (not that pedal travel is an indicator)
    If the truck has auto slacks you should not have to adjust them, in fact if you do need to adjust auto slacks they need repair or replacement.
     
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  7. Loaderlou

    Loaderlou Medium Load Member

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    Feb 24, 2014
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    And remember the most important thing, grease is cheap, use it regularly.
     
  8. KWmech

    KWmech Light Load Member

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    Jun 16, 2012
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    This is incorrect, you turn the adjuster clockwise to adjust it. Says so right on the clutch.
     
  9. bigguns

    bigguns Road Train Member

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    Omega,GA
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    A 2005 truck should have auto slacks and not need adjusting. Depending upon the make there are different procedures for making adjustments. Old thread but the advice still applies.
     
  10. gunner76

    gunner76 Medium Load Member

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    auto slacks don't always work properly.
     
  11. 140mower

    140mower Bobtail Member

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    Jan 20, 2015
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    Exactly..... They require a full brake application or close to it to get them to adjust. Nothing is truly maintenance free, and brakes are the last thing I'd trust to auto adjust with-out regular checking.
     
    The Man said Ride Thanks this.
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