gypo86
24th August 2006, 07:37 PM
I have a problem with my ae86's front end shuddering under braking. This shudder gets worse the slower the car gets under braking and the steering wheel shakes.
I had Rx7 4spot calipers put on the front end by IDB in Melbourne.
The setup is three or so years old now but the calipers where reconditioned and the disc were new at the time.
The problem has gradually gotten worse over two and a half years. Other front end parts have been replaced; ball joints, tie rod ends but not the steering rack which I have been told is good? The car has koni's King springs 35mm drop and Whiteline sway bar
I have had the disc machined 3 times in a year and a half.
I think it the discs, mechanics have said there is no problem but the problem never really disappears after machining the discs and it soon comes back come. It has been getting worse.
My theory is that the slots in the discs are causing it?
You see the slots in the discs point in the same direction on either side of a disc, not a mirror image.
That is if you look at the LHS front disk through the wheel the slots radiate from the centre out in an anti-clockwise direction.
If you look on the inside of the LHS front disk it also radiate from the centre out in an anti-clockwise direction also?
Now get this, on the RHS its different sort of, the slots on both sides of the RHS disc radiate out from the centre in a clockwise direction ??
This does not sound normal to me!! The disc were made up by IDB, I think they fudged it but has it causing my problem.
I thought that the slots would angle away from the approaching pad as the disc rotates,
As in slots radiate out from the centre:
RHS outside in an anti-clockwise direction
RHS inside clockwise
LHS outside clockwise
LHS inside anti-clockwise
I also know that the pistons are sticking some or stiff (“not a problem" said the last mechanic?), which could be contributing to the problem, by possibly pushing the tip of the pad into the disc and grabbing the slot?
Please any advise would be appreciated, thanks
I had Rx7 4spot calipers put on the front end by IDB in Melbourne.
The setup is three or so years old now but the calipers where reconditioned and the disc were new at the time.
The problem has gradually gotten worse over two and a half years. Other front end parts have been replaced; ball joints, tie rod ends but not the steering rack which I have been told is good? The car has koni's King springs 35mm drop and Whiteline sway bar
I have had the disc machined 3 times in a year and a half.
I think it the discs, mechanics have said there is no problem but the problem never really disappears after machining the discs and it soon comes back come. It has been getting worse.
My theory is that the slots in the discs are causing it?
You see the slots in the discs point in the same direction on either side of a disc, not a mirror image.
That is if you look at the LHS front disk through the wheel the slots radiate from the centre out in an anti-clockwise direction.
If you look on the inside of the LHS front disk it also radiate from the centre out in an anti-clockwise direction also?
Now get this, on the RHS its different sort of, the slots on both sides of the RHS disc radiate out from the centre in a clockwise direction ??
This does not sound normal to me!! The disc were made up by IDB, I think they fudged it but has it causing my problem.
I thought that the slots would angle away from the approaching pad as the disc rotates,
As in slots radiate out from the centre:
RHS outside in an anti-clockwise direction
RHS inside clockwise
LHS outside clockwise
LHS inside anti-clockwise
I also know that the pistons are sticking some or stiff (“not a problem" said the last mechanic?), which could be contributing to the problem, by possibly pushing the tip of the pad into the disc and grabbing the slot?
Please any advise would be appreciated, thanks