Features

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

The ABS power pump assembly is under the bonnet, between the battery and the ABS modulator. First depressurise the system.
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.
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Located under this multi-plug is a second multi-plug which is the main power supply and will disconnect electrical power from the unit
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.
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Using a suitable hose clamp, clamp off the hose connecting the reservoir to the power unit then remove the pipe from the power unit.
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.
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The complete ABS power unit should now be free, and you will be able to carefully lift it away from the engine bay.
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.
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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.
A protective cap should have been fitted into the reservoir pipe entry to keep dirt out. This can also be removed prior to connecting.
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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
Locate the replacement power unit correctly into position clear of other parts and refit the three securing nuts and tighten them.
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Reconnect the two multi-plugs, then refit the hose from the reservoir to the replacement power unit, then remove the hose clamp.
Refit the banjo bolt through the high-pressure pipe and washer, then connect the high-pressure pipe to the replacement power unit
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Once these pipes have been connected, the replacement ABS power unit should now be fully in position and working
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.
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