Steering rack bolts - location (photos?)

4.2 V8 32v Naturally Aspirated - 414 bhp
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lugars4
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Steering rack bolts - location (photos?)

Post by lugars4 » Mon Apr 15, 2024 9:23 am

So i think i have play in my steering rack, hear a knocking the wiggling the wheel, its not joints etc.

I read a lot about loose mounting bolts, i can only see the passenger side one, its not moving.

The drivers side has two bolts, one top, one bottom.
Wishing to check the top one first, i cant see it anywhere, it must be around the brake fluid reservoir?

Any advise appreciated.

I wonder if this knocking is what i thought was suspension related since i purchased the car in 2010, with new shock fitted, etc, it never went away..... fingers crossed.
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

r8wut
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Re: Steering rack bolts - location (photos?)

Post by r8wut » Mon Apr 15, 2024 5:16 pm

Have read it seems to be a fairly common issue that the Steering rack bolts become loose.. although that does seem odd to me.

As far as I'm aware, there are 3x steering rack bolts - two on top, one underneath:
Steering Rack Track Tie Rod Ends1.png
Think one is located underneath the ECU, under the plenum chamber / skuttle panel

r8wut
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Re: Steering rack bolts - location (photos?)

Post by r8wut » Mon Apr 15, 2024 5:19 pm

Have you replaced or checked the front Drop links and front ARB bushes?

Also, check the upper control arms , and Top mounts at the same time?

I reckon any of those could potentially also cause the dreaded knocking..

r8wut
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Re: Steering rack bolts - location (photos?)

Post by r8wut » Mon Apr 15, 2024 5:28 pm

Actually, whilst on the topic of the Steering Rack...

Wonder how many owners renew / flush their Steering rack fluid?

I checked mine last month..

what can I say .. it was putrid / rank in both look + smell - never been changed
IMG_20240321_161356.jpg
IMG_20240321_161812.jpg
IMG_20240321_164614.jpg
IMG_20240321_165504.jpg

r8wut
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Re: Steering rack bolts - location (photos?)

Post by r8wut » Mon Apr 15, 2024 5:33 pm

Made the mistake years ago with another vag car - left the old PS Fluid (read overlooked) in there for ~20years...

huh.

Surprise. Surprise.

The Steering Rack eventually developed a leak..

Had to replace the entire Steering Rack on the driveway - on my back. Nice. :boohoo:

lugars4
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Re: Steering rack bolts - location (photos?)

Post by lugars4 » Mon Apr 15, 2024 8:21 pm

Thats now on my list to do, thank you.

Where did you drain it?
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

lugars4
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Re: Steering rack bolts - location (photos?)

Post by lugars4 » Mon Apr 15, 2024 8:27 pm

So i found the top bolts, one is hidden under the brake vacuum booster. Can just seeit if you look with a torch from the drivers side, had to blow the area out with an air line and there it was.

And its Tight! Both top ones are, and dont move when rocking the wheel and hearing the noise.

So it's something else.

Replaced rod ends and can feel the inners have no play.

Sound is coming from the rack itself, i am 90% sure now. So seeing this in the workshop manual. Has anyone had their rack adjusted for backlash play?
Easy to access from below, i am wondering?
Steering Rack Adjust.pdf
(42.17 KiB) Downloaded 12 times
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

r8wut
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Re: Steering rack bolts - location (photos?)

Post by r8wut » Mon Apr 15, 2024 11:27 pm

Well. I didn't know the RS Steering rack was adjustable.. that's interesting

Here's a close-up of that rack adjusting screw:
Audi RS Steering rack1 8E2422053S.jpg
Audi RS Steering rack2 8E2422053S.jpg
Let us know if any rack adjustments cures your knocking..

In terms of PS Fluid renew / flush, never found any drain plug as such - so you can either disconnect the hose from the bottom of the PS reservoir to drain - or syphon out all the old fluid, which is what I usually do.

Give the reservoir a good clean, and fill with new fluid. Then, purge the rack of any air / get rid of any air-locks by turning the wheels side to side - with the reservoir cap off and engine off. (easier to do when wheels are off the ground).

Do this a couple of times over a few years (or as you determine) .. to flush the system .. and you'll notice the difference in steering feel.

lugars4
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Re: Steering rack bolts - location (photos?)

Post by lugars4 » Fri Apr 19, 2024 7:56 am

Thanks, i will have a go at adjustment over the weekend, having just replaced all the front suspension, its certainly the rack and driving yesteday i was reminided it's worse when cold.
May make sense if the rack/fluid warms up, its also right above the exhaust manifold so will get some heat off that, maybe something expands, who knows.

Not sure how easy it will be to access the adjuster, cant find any examples of anyone doing it on the B7 RS4.
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

JamesBaby
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Re: Steering rack bolts - location (photos?)

Post by JamesBaby » Fri Apr 19, 2024 10:20 am

I have done a write up here on how to flush the fluid out:
viewtopic.php?f=121&t=131868&start=30#p917323

lugars4
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Re: Steering rack bolts - location (photos?)

Post by lugars4 » Fri Apr 19, 2024 11:10 am

Thats great, thank you.

Nice easy maintenance job and certainly due at 18 years old now.
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

se4njb7
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Re: Steering rack bolts - location (photos?)

Post by se4njb7 » Thu May 30, 2024 7:28 am

lugars4 wrote:
Fri Apr 19, 2024 11:10 am
Thats great, thank you.

Nice easy maintenance job and certainly due at 18 years old now.
Did you fix it? I think I may have the same problem as you. I’ve ordered new rack bolts to replace anyway but this might be the problem if the new bolts don’t cure the knock

lugars4
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Joined: Tue Apr 27, 2010 3:34 pm
Location: Kent

Re: Steering rack bolts - location (photos?)

Post by lugars4 » Thu May 30, 2024 10:48 pm

I dont beleive the rack is knocking. Looking at DRC re-charge now.

The rack bolts were tight.

The knock i feel / hear rocking the wheel with engine off, goes away with engine running. But it was a concern. However our other VW car appears to do the same, so maybe a knock when rocking the wheel is normal without the power steering running?
06 - B7 RS4 Saloon - Milltek Non-Res Valved. BMC Filter.

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