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Author Topic: Pulling when braking  (Read 503 times)

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danzigfan

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Pulling when braking
« on: Yesterday at 10:51:51 »

Hi guys, I had a 'little" misshap last year...I hit a concrete barrier with front right side. The wheel got also hit and from then on car pulls to the right when braking. I did full geometry setup twice, replaced bushings preventively, suspension has no play anywhere. Drives straight and doesn't wonder on the road, no shaking, no wobble whatsoever.
I'm puzzled, what else should I look into? Should I replace front brake calipers in case right one is sticking or grabbing force is different?
Thanks in advance, Stan
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danzigfan

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Re: Pulling when braking
« Reply #1 on: Yesterday at 11:05:48 »



This was the damage
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cam.in.head

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Re: Pulling when braking
« Reply #2 on: Yesterday at 14:13:39 »

if the full alignment geometry was done correctly then this should have picked up on any alignment irregularities from anything unseen that  could have got bent in the bump .this should have shown if the subframe had moved or wishbone damage affecting the castor angle.i would have expected the camber to have moved ?but should have been reset anyway .
SO  and saying that it still drives and tracks straight we should be ok here
 next you need to be sure that the caliper is free as it should be AND comparable to the other side in respect of piston ease of movement,slide pins ,and any other obvious differences if any .you would think that pulling to the right would indicate a problem with the left brake realy but hopefully something should be obvious ,check for any bracket distortion too from

 the impact also worth swapping front wheels side to side too (unless tyres are directional)
w
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cam.in.head

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Re: Pulling when braking
« Reply #3 on: Yesterday at 14:44:25 »

so to sum up .
basically if the car drives fine untill you touch the brakes then this means one of two things .
either something is moving when you brake through wear,looseness or softness
OR  the brake is doing something different to the other side
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danzigfan

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Re: Pulling when braking
« Reply #4 on: Yesterday at 15:23:09 »

So the best option would be to go to mechanic or MOT place, whoever has the rollers where I could see braking force on wheels probably.
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Doctor Gollum

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Re: Pulling when braking
« Reply #5 on: Yesterday at 15:39:33 »

The alignment adjustment allows for a limited range of tolerance and does nothing to correct the position of the wheel relative to the axle centre line. If the right wheel is back from the original axle centre line then the car will pull that way when you add weight to the front end, ie under braking. An inspection brake test will rule out brake imbalance which is the road your mind is going down.

The following is belts and braces, but the critical point is that unde no circumstances do you take any measurements against a removable body panel.

If the wheel got hit then start with a detailed inspection and measurement of the front subframe mounting points. You'll need access to a four post lift and the tyre and tyre pressures must be identical to ensure an accurate height measurement.

Measuring the diagonals will confirm if the subframe is still square. Bolt to bolt.

Do the same with the chassis rails independently of the subframe measuring the length and height at both ends. The front where the reinforcement bar bolts on and where the rails end  on the floorpan.

Do the same with the top mount centre to the rear bolt of the opposite bonnet hinge and opposite upper/outer headlight bolt.

Do the same with the diagonals from the end of the chassis rails where the reinforcement bar bolts to the opposite corner of the lower radiator support.

If any of these are out by more than a few mm then the chassis needs tweaking straight.

If these all match up, within a couple of mm, very carefully inspect the bolt heads on the subframe mounts to see if there's and witness marks from the subframe having moved during the impact.

If there are marks then the subframe was hit hard enough to move it. Reposition it.

Replace the wishbones, struts, and wheel bearing and the wheel if it doesn't run true when spun.

Then realign it.

You could skip to the replacing parts section, but if the right chassis leg or subframe are tweaked, then you're wasting your time.
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Doctor Gollum

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Re: Pulling when braking
« Reply #6 on: Yesterday at 15:40:02 »

So the best option would be to go to mechanic or MOT place, whoever has the rollers where I could see braking force on wheels probably.
Only to rule out brake imbalance.
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danzigfan

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Re: Pulling when braking
« Reply #7 on: Yesterday at 15:43:30 »

Ok....will check brake imbalance first and then onto measuring the frame...Thanks
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