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Old 01-04-2018, 12:02 AM
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Morning all,

What might cause a car to pull to right under (only heavy) braking, and also, subtley pull the car to the left under acceleration??

Tyre pressures perhaps? "

2 seperate coincidental factors? My front calipers are in good shape, but the brake lines are original - could that cause an imbalance if one is getting tired?

I'm currently running knobbly old winter tyres with big blocks so perhaps thats a factor too..?
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Old 01-04-2018, 01:15 AM
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Tyres pressures are the most likely cause, followed by a seized or sticky caliper.
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Old 01-04-2018, 01:52 AM
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Tyre pressures first, if none of the callipers are getting hot (front or back) brake lines are either sound or bust so not so likely, Have you hit one of our famous British pot holes lately? that might have put the geo out.
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Old 01-04-2018, 02:59 AM
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Originally Posted by richmc View Post
Tyre pressures first, if none of the callipers are getting hot (front or back) brake lines are either sound or bust so not so likely, Have you hit one of our famous British pot holes lately? that might have put the geo out.
I'm certainly not ruling out potholes - I seem to seek out more than my fair share. But I would have expected that to make the car pull one way or other all the time, rather than just under harsher inputs?
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Old 01-05-2018, 12:40 AM
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Usually rear tyre pressure or wear. I used to drive to work around a number of roundabouts on which I used to have some fun. My rear left tyre wore quicker than the right and I noticed a slight pull when they were over half worn, plus a little shimmy when going over catseyes etc. A worn rear toe arm bush might exacerbate it too.

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Old 01-05-2018, 12:56 AM
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Checked the pressures last night - sure enough the nearside rear was low. It has helped a little, but it still veers about under hard braking. In trying to diagnose, I've also found that the offside front is locking up fairly easily, so perhaps it is a caliper after all..
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Old 01-05-2018, 01:12 AM
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Originally Posted by S2Bray View Post
I'm certainly not ruling out potholes - I seem to seek out more than my fair share. But I would have expected that to make the car pull one way or other all the time, rather than just under harsher inputs?
Not necessarily - the car has passive RWS and toes-in under braking loads for additional stability. Or in the case of cross-toe/thrust angle, additional instability.

If it's not defective tyres or a sticky brake, probably alignment. Even a knackered compliance bush will make the suspension do weird things.
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Old 01-05-2018, 12:04 PM
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I would also take a look at your rear trailing arm bars - check them for free play as well as the above.
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Old 01-08-2018, 02:37 AM
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Thanks all
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Old 01-08-2018, 04:17 AM
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Originally Posted by Nick Graves View Post
Not necessarily - the car has passive RWS and toes-in under braking loads for additional stability. Or in the case of cross-toe/thrust angle, additional instability.

If it's not defective tyres or a sticky brake, probably alignment. Even a knackered compliance bush will make the suspension do weird things.
It toes out under braking (when the rear is higher in its suspension travel). It toes in during compression, under load (ie when on throttle, to increase stability under acceleration). Hence lift off oversteer kills so many!
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