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Power wires insulation has crumbled away.

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Old Sep 14th, 2020, 23:59   #1
Moose850
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Default Power wires insulation has crumbled away.

I have to remove the ABS pump on. Any tips particularly when it comes to bleeding system after refit?

Can the plastic cap be removed as I need to fit two new power cables as the insulation has gone brittle and is crumbling off? These cable go up into the black plastic cap.
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Old Sep 15th, 2020, 09:41   #2
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I have to remove the ABS pump on. Any tips particularly when it comes to bleeding system after refit?

Can the plastic cap be removed as I need to fit two new power cables as the insulation has gone brittle and is crumbling off? These cable go up into the black plastic cap.
Yes, it can be removed. Easy to remove when the pump is off, a nightmare in car. You can just cut these wires up towards the top end, add heatshrink and solder the join.
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Old Sep 15th, 2020, 11:20   #3
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Yes, it can be removed. Easy to remove when the pump is off, a nightmare in car. You can just cut these wires up towards the top end, add heatshrink and solder the join.
That's good news. Any bleeding issues likey? None is this 'auto-bleed' using OBD scanner I hope like more modern stuff.

I normally start furthest wheel but someone said with Volvo you start nearest?
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Old Sep 15th, 2020, 23:29   #4
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No idea, never had to remove a pump - so wouldn't like to comment.
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Old Sep 16th, 2020, 08:36   #5
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I removed the three torx screws that hold the unit to its mounting bracket and unclipped the brake pipes on the firewall and it came away from the turret a good few inches without disconnecting brake lines or putting any stress on the brake lines at all. There is a technique to getting the top off - just s queeze inthe right place and a tease with a screwdriver.

The insulation had crumbled off each cable to about 3/4" from the top where they go into the motor so it was a good call to remove the cap, a 'short' would have happened sometime soon. It is obviously an age related problem so a god thing to keep an eye on. I check two other cars of similar age and both showed signs.
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Old Sep 16th, 2020, 21:14   #6
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I've noticed the same thing on the last couple of pump units I've swapped out - must be the heat of the engine bay, or perhaps the heat generated by the current flowing through them when the pump motor is at full chat? Copious layers of elecrical insulation tape carefully applied also does a fine job if your nervous about cutting the supply cables to apply heatshrink.

Re: bleeding. Start on the O/S/R then N/S/R followed by O/S/F finishing N/S/F. I use a pressurised one man brake bleed kit & purge twice to be on the safe side. Brake fluid is cheap. Brake failure is not 😬.

Happy bleeding. Cheers
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