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[Terbs]

What are the torques for wishbones, I have a large torque wrench here. I believe I am right in thinking that this must be done with car on the ground ?
Anything is worth a try

[Entwood]

What are the torques for wishbones, I have a large torque wrench here. I believe I am right in thinking that this must be done with car on the ground ?
Anything is worth a try

not just on the ground, but with the front end loaded up .. equivalent to 2 adults IIRC ...

[chrisgixer]

What are the torques for wishbones, I have a large torque wrench here. I believe I am right in thinking that this must be done with car on the ground ?
Anything is worth a try

Ask him what he actually did. What torque did they tighten the bolts too...?

See of he knows for a start.



If you have poly fitted it doesn't matter if wheels are loaded or not, as poly have no orientation and are not attached to the inner or outer like oe rubber ones.

But, if oe rubber bushes are fitted, the bolts must be torqued wheels loaded/car in the ground/suspension at normal ride height.

[Lazydocker]

Hmmm... Symptoms could also match air/water in the brake fluid

[05omegav6]

Hmmm... Symptoms could also match air/water in the brake fluid

Even though the car pulls up square on the brake rollers

[cd 2.2]

Just a stab in the dark ... but ... Have you checked your track rod ends?? They can do very strange things and can get amplified under braking and acceleration  I have experienced this first hand with my brothers BL Princess after we changed the pair of track rod ends a year ago, Only covered 2000 miles and n/s failed, very shortly followed by the o/s one! The car swerved around under any kind of braking and didn't behave so good when accelerating    Just a thought as no one else has mention it as a possibility and lets face it, these are the things that stop your wheels from turning wherever the hell they like. If these parts are failing it COULD cause this issue, If no-one has looked there yet I sure as hell would 

Got to be worth a look

[Terbs]

Its been up on lifts, with men underneath with pry bars etc, etc, etc going all over the joints and such.

Had a thought...would faulty discs cause this, say a crack in the central vent bits, or a distorted disc. But there again, I suppose that would have showed when it went in for brake testing

[cd 2.2]

Original symptom as I reported in original thread a few months back, outside lane M3, 70mph or thereabouts, car in front braked, I hit mine and promptly swerved left into the middle lane. Luckily, I had overtaken a car and there was a gap for me.
No work had been done on the car. Went to WIM after first wishbone replacement, then again after the second wishbone replacement.

If you had a cracked disc that is inherently dangerous ... I had a front disc shear off a long time ago, It was my old 1984 Audi 80 1.6 E (oooh sporty lol) and I was slowing down fast from 60mph approaching a road end. Didn't know there was a problem until I had enough pressure on the brakes to shear off the braking surface of the disc from the centre! The result was a sudden and catastrophic failure of the primary braking system, pooh coming out and nearly hitting a tree! I'm still thankful to this day that no traffic was on that junction, god knows what the carnage would have been 

Another thought I had is this ... What if you have a BAD tyre Maybe the internals of one of the tyres have failed (you did say it happened first on the motorway while heavy braking from 70mph)! you could look all day for that problem and never, ever find it ... that is until the tyre completely failed and blew out 

Have you tried swapping the fronts onto the rear to see if there is any improvement???  As in my mind you have checked just about everything else ... Tyres is about the only other thing I could think of it being and very easily overlooked! It wouldn't even matter if they were brand new, If they were on the car during the heavy braking incident they could still have failings and you may have a warranty claim

[chrisgixer]

Its been up on lifts, with men underneath with pry bars etc, etc, etc going all over the joints and such.

Had a thought...would faulty discs cause this, say a crack in the central vent bits, or a distorted disc. But there again, I suppose that would have showed when it went in for brake testing

No, not really. Wheel speed is much higher frequency than "swerve" speed, if you see what I mean.

What effect does the swerve have on the steering? I know you went into it but it needs a bit more detail to separate braking from steering.

For instance, as you brake, is the pull directly related to brake force. The more you brake the more it pulls. Let off the brake and the pull subsides accordingly.

Then add to that what the steering does. For instance, brake and the car bears left and you steer into it to keep straight. Or, the act of braking physically turns the steering wheel in your hands, so the car goes left while the steering turns right.( or vice versa )

[Terbs]

I am going out in it in a minute to test it and report back. Its quiet round here, but have some good, 'try out' roads, but I won't do anything stupid.
I do agree about tyres....years ago my Senator shook you to bits at 60mph, perfect till then. Went to various gearbox, propshaft, suspension experts, problem was caused by mismatched rear tyres!!!!

I do have two Omega's so could swap some bits around to see if there is any difference.

[joff]

I fitted e-bay wish bones to my DTI about six weeks ago with new drop links, put two CDX wheels and tyres on that i got from a member on here with good tyres (Omega is a CDX), took it to a local tyre company to have tracking done as i did not have time to get up to WIM for a full check. On the way to the tracking garage car was driving fine, tracking done and car not as good, MoT and car passed 100%, since then car pulls to the left and i get a knocking from both sides on front, fitted new steering idler the other week and still the same. I have some time Sunday/Monday to have a look and am now thinking track rod ends which i have a new set of to go on. First thing i am going to check is that the garage did the bolts up correctly on the track rod adjusters

[chrisgixer]

Original symptom as I reported in original thread a few months back, outside lane M3, 70mph or thereabouts, car in front braked, I hit mine and promptly swerved left into the middle lane. Luckily, I had overtaken a car and there was a gap for me.
No work had been done on the car. Went to WIM after first wishbone replacement, then again after the second wishbone replacement.

So since the m3 incident, has anything affected the symptoms in all that work done?

[Terbs]

No Chris...drove exactly the same.

However I have just been out around the village, and I don't think the swerve is anywhere as bad as it was. One that is noticeable is the snatch of the steering wheel to the right. !!!
At 20-30mph....car running straight...hands off wheel, normal braking, steering wheel snatches about a couple of inches to the right, car stays fairly straight.
10mph....press brake, steering wheel snatches right...car stays straight.
Light braking.....minor snatch if any, car straight. then hit pedal hard...snatch to right.
The what was a dangerous swerve to the left is not as bad and only seems to appear if applying brakes on a left bend, no snatch to the right as obviously pressure is on the steering wheel in the turn. Same applies to a right bend.
I think Al is possibly right about the wishbone bushes. It seems the cheapest way to go, then see what happens.
I don't suppose you are around over the weekend to have a drive of it.

[chrisgixer]

I'm about today. No problem. If you have any ramps chuck them in the boot.

Sounds like what TB had. Loose wishbone bolts. Or failed rearward bushes could do the same.

It might be that the original bushes failed, and they replaced the wishbones and didn't tighten the bolts enough. Which would replicate the same symptoms.

[TheBoy]

Hmmm, yes, sounds familiar to TBE, which started doing this all of a sudden. It becomes remarkably predictable once used to it. Mine turned out to be the rearward bolt had slightly loosened (presumably, as it had been fine for months previously), allowing a bit of movement under heavy braking.