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1994 Isuzu elf 150

All specs for front and rear drum brakes minimum machine thickness and mfr's drum thickness mfr's shoe thickness please?

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  • Cars & Trucks Master
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The spec is on the drum

Posted on Nov 06, 2013

Testimonial: "thankyou for your input very helpful.i dont have a drum in question as this is an assessment course i doing and all i need are answers relating to the subject'"

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  • Cars & Trucks Master
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Why are you concerned with the minimum thickness measurements?
If you do not have the knowledge to get the info I feel you should be passing this task to a qualified tech, who would likely have this info at their disposal and do the task correctly.
Brake work is not for the untrained. I know there is a culture of re-machining drums and discs but go to a parts house or ebay and fit new.
Then you know they will hold up when you most need them.
Most discs and drums have the min thickness figures cast in them. When pads and shoes are worn, they're worn. Pads about 1/8th even pad left, shoes 50% of original thickness unless mfr says otherwise.
This advice is based on you knowing your capabilities.

Posted on Nov 06, 2013

Testimonial: "i am a student doing a course for panelbeating and thi s is a question on one of my assessment sheets AND YES i do know how to dismantle and repair thankyou i am not naive i do know what im doing!"

  • 1 more comment 
  • Marvin
    Marvin Nov 07, 2013

    The general rule of thumb for pads and brake shoes is that when they are worn to 70% of original thickness you should plan for new brakes within no more than 1000 miles or sooner if you are hard on brakes or live in a hilly area or commute in stop and go.

  • Marvin
    Marvin Nov 07, 2013

    I also agree about new verses machined. Brake rotors are much more prone to warping if they are cut down in the machining process and the whole job will need to done again. There is a parts supplier on line that sell high quailty parts for way below local prices, the web address is www.rockauto.com

  • Timllfixit Nov 07, 2013

    I wasn't infering you were not capable but you were asking for wear limits on a '94 vehicle which gave the impression you had concerns about wear limits. If you had made your question a little clearer I could have answered in one line like Dennis did. Regards.

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Rear DRUM instructions are first If you would Like Pictures and all They Must Be Emailed as TOO LARGE For FixYa's Format im at aol.com
Just use my Knickname@ and let me know where to send.


  1. Raise and support rear of vehicle, then remove wheel and tire assembly.
  2. Remove brake drum. If brake drum cannot be removed easily, insert a suitable screwdriver through hole in backing plate, then push adjuster lever away from adjuster and back of adjustment tension.
  3. Remove tension spring, using a suitable tool, then remove rear shoe hold-down spring and pin. Remove rear brake shoe and anchor spring, Fig. 7.
    1. On Land Cruiser models, remove front hold-down spring using a suitable tool, then disconnect the parking brake cable from the parking brake bellcrank, Fig. 7.
    2. On Pickup, 4Runner, 4WD T100 and 4WD Tacoma models, remove front shoe hold-down spring and pin, using a suitable tool, then disconnect No. 1 parking brake cable from No. 3 parking brake bellcrank.
    3. On 2WD T100 models, proceed as follows:
      1. Remove E-ring, then automatic adjusting lever and C-washer, then parking brake lever. Disconnect brake line from wheel cylinder using a suitable container to catch fluid.
      2. Remove wheel cylinder. Remove following parts from wheel cylinder: two boots, two pistons, two pistons cups and spring.
    1. On models except 2WD T100, remove front brake with strut, then disconnect parking brake cable from front shoe. Remove parking brake cable No. 2.
    2. Remove adjusting lever spring, then the adjuster from front shoe.
    Inspection
    1. Measure brake drum inside diameter. Inside diameter should be 11.61 inches,
      1. Measure brake shoe lining thickness, Fig. 3. Minimum thickness should be .04 inch on models except on T100 models and .039 inch on T100 models.
      2. Inspect brake lining and drum for proper contact and replace drum or shoes as necessary.
      3. Inspect wheel cylinder for corrosion or damage.
      4. Inspect backing plate for wear or damage.
      5. Inspect bellcrank components for bending, wear or damage.
      6. Apply a suitable lubricant to backing plate contact areas.
      Installation
      1. On 2WD T100 models, proceed as follows:
        1. Apply lithium soap base glycol grease to piston cups, pistons and boots.
        2. Assemble and install wheel cylinder.
        3. Connect brake line to cylinder.
      1. Apply high temperature grease to following parts:
      1. Apply a suitable lubricant to adjuster bolt threads and end.
      2. Assemble adjuster to lever, then install adjuster lever spring.
      3. On Land Cruiser models, install parking brake lever cable to parking brake shoe, then attach cable to bellcrank.
      4. On Pickup, 4Runner, 4WD T100 and 4WD Tacoma models, install No. 1 parking brake cable to parking brake lever shoe, then attach the other side of cable to No. 3 bellcrank.
      5. Position front shoe in place with end of shoe inserted into piston, then install shoe hold-down spring and pin using a suitable tool.
      6. Assemble anchor spring to front and rear shoe, then install rear shoe with end inserted in piston.
      7. Install rear shoe hold-down spring and pin, then the tension spring.
      8. If necessary, adjust bellcrank as follows:
        1. Lightly pull bellcrank in direction "A", Fig. 8, until there is no slack in part "B".
            1. Rotate adjusting bolt until dimension "C" is .016-.031 inch.
            2. Lock adjusting bolt with locknut, when connect parking brake cable to bellcrank.
            3. Install tension spring.
          1. Ensure proper parking brake travel.
          2. Pull adjusting lever cable upward, then release and ensure adjusting bolt rotates. If bolt does not rotate, check for improper installation of rear brakes.
          3. Adjust strut to shortest possible length, then install drum.
          4. Pull parking brake lever fully upward. Repeat process several times.
            1. Remove drum, then check for proper clearance, Fig. 4. Clearance should be .024 inch. If clearance is not as specified, check parking brake system.
            2. Install brake drum, then bleed and refill brake system.
            3. Install wheel and tire assembly, then lower vehicle.

FRONT ROTORS & PADS
  1. Remove caliper.
  2. Remove cap and snap ring, Fig. 10, then remove cone washers with tapered punch.
  3. Insert suitable length bolts into flange bolt holes, then tighten bolts evenly and remove flanges.
  4. Remove free wheel hub cover and snap ring, then remove nut, spring washer and cone washer with suitable tapered punch.
  5. Remove free wheel hub body and gasket.
  6. Remove locknut, lock washer and adjusting nut.
  7. Remove axle hub and brake disc as an assembly.
  8. Remove oil seal and inner bearing from hub.
  9. Reverse procedure to install. Torque adjusting nut to 43 ft. lbs., then back off nut. Torque nut to 18 ft. lbs. Using spring scale attached to hub bolt, check that preload is 1.4-12.6. Install lockwasher and locknut, if equipped. Torque locknut to 35 ft. lbs., and recheck preload. Secure lockwasher by bending one tab inward and one tab outward.
  1. Raise and support front of vehicle, then remove tire and wheel assembly.
  2. Remove clip and hole pins, Fig. 9.
  3. Remove anti-rattle spring and shim(s) if equipped, then remove brake pads.
  4. Lubricate caliper housing with suitable brake grease at pad contact points.
  5. Reverse procedure to install.

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