Question about 2000 Chevrolet Silverado 1500

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00 Chevy EHCU HELP

I have a 00 Chevy Silverado and recently replaced the rear brake line due to blown rusty one but i had to remove all brake lines going to the EHCU due to the transfercase and tortion bars in the way to get to them indivdualy.. so i had to bend them out of my way and didn't take note on where they go after i got the new line in. i have 5 lines to connect. 1 front master cyl brake line 1 rear master cyl brake line 1 front drivers brake line 1 front pass. brake line 1 rear brake line
(1)...(2)...(3) 3 across the top
(4)...(5) 2 across the middle
(C)...(C) 2 capped lines i believe are to bleed the echu not sure thou Since i had all lines off do i need to bleed the unit itself or just go thru reg. bled sequence Passenger rear, drivers rear, passenger front, then driver front.

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  • Anonymous Aug 29, 2009

    ok bleed each indivdualy.. but back to the main question which brake line goes where lol....
    3 top 2 middle and 2 bottom that are capped

  • Charlie Davis
    Charlie Davis Sep 03, 2012

    so how do these line go back into the EHCU?



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Bleed each separately

Posted on Aug 29, 2009

  • Anonymous Aug 29, 2009

    the best thing to do would be to take it to a mech well have one come to you



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Bleeding the EHCU

Bleeding the EHCU requires the use of the TECH-1 scanner or its equivalent and the appropriate cartridge. Additionally, 3 tools, J-39177 or equivalent, are required. Bleeding cannot be performed without this equipment.
The EHCU must be bled after replacement or if air is trapped within the unit. It must be bled after bleeding the master cylinder and before bleeding the individual wheel circuits.
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  1. Open the internal bleed valve 1 / 4 - 1 / 2 turn each.
  2. Install one tool J-39177 on the left bleed stem of the EHCU. Install one tool on the right bleed stem and install the third tool on the combination valve.
  3. Inspect the fluid level in the master cylinder, filling if needed.
  4. Slowly depress the brake pedal and hold it down.
  5. Open the left bleeder on the front of the unit. Allow fluid to flow until no air is seen or until the brake pedal bottoms.
  6. Close the left bleeder, then slowly release the pedal. Wait 15 seconds.
  7. Repeat Steps 4, 5 and 6, including the 15 second wait, until no air is seen in the fluid.
  8. Tighten the left internal bleed valve to 5 ft. lbs. (7 Nm).
  9. Repeat Steps 3-7 at the right bleeder on the front of the unit.
  10. When bleeding of the right port is complete, tighten the right internal bleed valve to 5 ft. lbs. (7 Nm).
  11. Remove the 3 special tools.
  12. Check the master cylinder fluid level, refilling as necessary.
  13. Bleed the individual brake circuits at each wheel.
  14. Switch the ignition ON . Use the hand scanner to perform 3 function tests on the system.
  15. Carefully test drive the vehicle at moderate speeds; check for proper pedal feel and brake operation. If any problem is noted in feel or function, repeat the entire bleeding procedure.

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