11 replies to this topic

[Fangio]

On track days, I'm beginning to experience some braking issues with the car tugging/fidgeting left & right under hard braking after high speed straights. I've recently upgraded to EBC grooved disks, but I've been running braided hoses, 5.1 AP racing fluid, Carbone Lorraine RC6 front & 5+ rear, for quite some time. I'm on R888s 16 front & 17 rear. Anyone had similar experience or got any ideas or suggestions? Thanks.

[fiveoclock]

Apart from 5+ at the rear (I have 6 on the rear) thats the same set up as me, I have no issues. Have you checked the geo recently?

[techieboy]

Have you checked the geo recently?

Check all of the suspension for play as well. Could be a warn ball joint or bushes past their best.

[Mike (Cliffie)]

Yup, sounds more geo than brakes.

[Fangio]

Geo done about 6 months ago so I think should still be ok. I'll get the wheels off tomorrow and give everything a good look over.

[kipper]

On track days, I'm beginning to experience some braking issues with the car tugging/fidgeting left & right under hard braking after high speed straights. I've recently upgraded to EBC grooved disks, but I've been running braided hoses, 5.1 AP racing fluid, Carbone Lorraine RC6 front & 5+ rear, for quite some time. I'm on R888s 16 front & 17 rear.

Anyone had similar experience or got any ideas or suggestions?

Thanks.

I've got a slight problem with my set up at the moment. I run the AP big brake kit, and up graded to CL RC5's all around just before last years national. Since then have done a couple of more track days, but have experienced a progressive judder
with feed back through the steering wheel. The problem occurs under light to moderate braking but disappears under heavy braking.
Just had the rotors skimmed 1 thou off of one disk and 3 thou off the other which was the worst of the two. Both disks are now running within 1 thou of perfect alignment with the bells. Beveled all of the pads and wet and dried, surfaces of the pads on a surface plate. Refitted and still have the vibration. Thinking of going back to the DS500 on the fronts and try again to see if it can get rid of the vibrations.

Also run A048's and 16/17" combination.

Dave

[fiveoclock]

Geo done about 6 months ago so I think should still be ok.

Not necessarily

[fiveoclock]

On track days, I'm beginning to experience some braking issues with the car tugging/fidgeting left & right under hard braking after high speed straights. I've recently upgraded to EBC grooved disks, but I've been running braided hoses, 5.1 AP racing fluid, Carbone Lorraine RC6 front & 5+ rear, for quite some time. I'm on R888s 16 front & 17 rear.

Anyone had similar experience or got any ideas or suggestions?

Thanks.

I've got a slight problem with my set up at the moment. I run the AP big brake kit, and up graded to CL RC5's all around just before last years national. Since then have done a couple of more track days, but have experienced a progressive judder
with feed back through the steering wheel. The problem occurs under light to moderate braking but disappears under heavy braking.
Just had the rotors skimmed 1 thou off of one disk and 3 thou off the other which was the worst of the two. Both disks are now running within 1 thou of perfect alignment with the bells. Beveled all of the pads and wet and dried, surfaces of the pads on a surface plate. Refitted and still have the vibration. Thinking of going back to the DS500 on the fronts and try again to see if it can get rid of the vibrations.

Also run A048's and 16/17" combination.

Dave

You haven't got a buckled wheel have you or a flat in the rim

[Seb.F]

Was going to say. Sounds like a wheels taken a knock.

[slindborg]

The geo is probably fine.... but there is probably a joint or bush fcuked causing movement under braking (probably does it on acceleration but you might not notice)

[kipper]

On track days, I'm beginning to experience some braking issues with the car tugging/fidgeting left & right under hard braking after high speed straights. I've recently upgraded to EBC grooved disks, but I've been running braided hoses, 5.1 AP racing fluid, Carbone Lorraine RC6 front & 5+ rear, for quite some time. I'm on R888s 16 front & 17 rear.

Anyone had similar experience or got any ideas or suggestions?

Thanks.

I've got a slight problem with my set up at the moment. I run the AP big brake kit, and up graded to CL RC5's all around just before last years national. Since then have done a couple of more track days, but have experienced a progressive judder
with feed back through the steering wheel. The problem occurs under light to moderate braking but disappears under heavy braking.
Just had the rotors skimmed 1 thou off of one disk and 3 thou off the other which was the worst of the two. Both disks are now running within 1 thou of perfect alignment with the bells. Beveled all of the pads and wet and dried, surfaces of the pads on a surface plate. Refitted and still have the vibration. Thinking of going back to the DS500 on the fronts and try again to see if it can get rid of the vibrations.

Also run A048's and 16/17" combination.

Dave

You haven't got a buckled wheel have you or a flat in the rim

Rims fine, never taken a knock, tyres good as well.

[Fangio]

I thought I should update on this. I fitted an ABS cut-off switch which I was able to play with at a track day last week. ABS on, I still had the fidgeting left & right under hard braking. ABS off, problem gone away. Braking all controlled in a straight line with no tugging left & right on the steering wheel. Had a few lock up situations where I'm just going to have to fine tune my right foot braking sensitivity, but in all cases it was safe and manageable. Actually with ABS off I felt my driving was in general far smoother and more controlled than with it on. I'm happy now that the problem is definately down to the poor performance of the standard ABS system at extremes of operation. While I'm comfortable without ABS in dry conditions on track days I think I'll now begin the search for the Exige/Elise S2 upgraded 4 way ABS module for use in the wet. Thanks for all the advise.