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How to replace the ABS power unit on a P38 - pictures

by: Auto Express team
27 Sep 2017
Go to: How to replace the ABS power unit on a P38
  • Step 1
    <span>The ABS power pump assembly is under the bonnet, between the battery and the ABS modulator. First depressurise the system.</span>
  • Step 2
    <span>Disconnect the multi-plug which is located at the rear of the ABS power pump. The spring retaining clip may need to be picked loose.</span>
  • Step 3
    <span>Located under this multi-plug is a second multi-plug which is the main power supply and will disconnect electrical power from the unit</span>
  • Step 4
    <span>The unit is secured to the valance on three rubber-mounted feet, two at the front and one at the rear. Undo and remove the nuts.</span>
  • Step 5
    <span>Using a suitable hose clamp, clamp off the hose connecting the reservoir to the power unit then remove the pipe from the power unit.</span>
  • Step 6
    <span>On the side of the unit, undo the banjo bolt on the high-pressure pipe, then remove the high-pressure pipe from the unit, along with the washer.</span>
  • Step 7
    <span>The complete ABS power unit should now be free, and you will be able to carefully lift it away from the engine bay.</span>
  • Step 8
    In this case a used unit from a reliable source will be fitted to the vehicle at the owner’s request. It appears clean, with fluid openings plugged.
  • step 9
    <span>On the replacement unit, a plug should be in the HP bore to stop dirt entering the pump. This can be removed prior to connecting.</span>
  • Step 10
    <span>A protective cap should have been fitted into the reservoir pipe entry to keep dirt out. This can also be removed prior to connecting.</span>
  • Step 11
    <span>Unless new ones have been supplied, before discarding the old unit remove the rubber mounts from the feet and fit them on to the replacement</span>
  • Step 12
    <span>Locate the replacement power unit correctly into position clear of other parts and refit the three securing nuts and tighten them.</span>
  • Step 13
    <span>Reconnect the two multi-plugs, then refit the hose from the reservoir to the replacement power unit, then remove the hose clamp.</span>
  • Step 14
    <span>Refit the banjo bolt through the high-pressure pipe and washer, then connect the high-pressure pipe to the replacement power unit</span>
  • Step 15
    <span>Once these pipes have been connected, the replacement ABS power unit should now be fully in position and working</span>
  • Step 16
    <span>The brake system may need to be bled. This should be done using the bleed screw on the side of the brake boost/ABS modulator.</span>

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