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Replacing knuckle - abs and wheel hub questions

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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Replacing knuckle - abs and wheel hub questions

Post by smacknab » Tue Mar 03, 2020 12:08 pm

A while ago I drilled out a caliper bolt to replace my calipers, but I accidentally drilled into my knuckle in the bolt channel. I'll soon be replacing my struts so I figured it was a good time to swap the knuckle with a used part I got from a salvage. The wheel bearing on the used knuckle is a little noisey but pretty smooth, so I'm not sure if I should swap the old bearing onto the new knuckle, or if at 210k miles I should swap both the front wheel hubs. Does anyone have any insight on the average lifetime of a wheel hub, and if the FAG hubs from FCP are fine, or if it's better to go with Volvo here?

The other question I had was about the abs sensor, as the knuckle also came with the wire/sensor. Is it better/easy to keep my current abs wire on, or should I keep the wire that's attached to the knuckle. I believe this came off a 2000/01 C70.
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Re: Replacing knuckle - abs and wheel hub questions

Post by abscate » Tue Mar 03, 2020 3:03 pm

Do you eat lots of 🥔?


FAG are fine. I’ve had three go from 110-180k miles
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Re: Replacing knuckle - abs and wheel hub questions

Post by scot850 » Tue Mar 03, 2020 3:13 pm

As for the ABS wire, it comes down to if you can remove it from the hub. If the hubs become really crusty in your area with rust, it might make sense to swap it all over including the wire.

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Re: Replacing knuckle - abs and wheel hub questions

Post by callahanoffroad » Tue Mar 03, 2020 6:01 pm

Personally I would just go ahead and replace the hubs and bearings while they're off. I had to do mine at 200k and 220k respectively. Make sure you have the correct Volvo bolts for the hubs. Hex head bolt will rub on the axles ask me how I know hahahahaha
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Re: Replacing knuckle - abs and wheel hub questions

Post by smacknab » Tue Mar 03, 2020 7:43 pm

Thanks for all the tips. I jacked the car up to test the play in the wheel at 3+9 & 12+6 and found no play in the 12+6 direction, so i think they may be fine.. still an item that I will have on my list to replace.

What's bothering me more right now is that I had some decent play at 3+9 on both sides, maybe 1/2 inch(?) with a solid feeling clunk at the 'end' of each direction of play. I just replaced the inner and out tie rods recently.. does this mean a bad steering rack? Diagnostics I'm reading on steering racks only use driving indicators like vagueness, dead spots, sticky steering etc. its a little harder to steer than other cars in a parking lot, but not too bad.
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Re: Replacing knuckle - abs and wheel hub questions

Post by abscate » Wed Mar 04, 2020 2:36 am

That does sound like rack, but control arms and ball joints last 100k In urban areas
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Re: Replacing knuckle - abs and wheel hub questions

Post by smacknab » Wed Mar 04, 2020 5:38 am

If it's the steering rack I'm dumping it's body by the dock in South Boston
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Re: Replacing knuckle - abs and wheel hub questions

Post by abscate » Wed Mar 04, 2020 5:42 am

It is a bit of a drag but there are much worse things.

Marblehead is the preferred drop zone, after removing the wheels and leaving it on cement blocks
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Re: Replacing knuckle - abs and wheel hub questions

Post by smacknab » Wed Mar 04, 2020 12:03 pm

I'm trying to have that Buddhist 'the cup is already broken' mentality
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Re: Replacing knuckle - abs and wheel hub questions

Post by abscate » Wed Mar 04, 2020 1:02 pm

Its more like a Zen - the cup half full of code P0455
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