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Front discs on 3.2 GT

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I'm getting a slight pulsing through the brake pedal when I'm braking coming up to a junction for example which makes me think my discs might be warped. However, I've just had the rear discs & pads replaced and the front discs and pads were replaced 6 months / 4,000 miles ago. My suspicion is the front discs as I've not done any harsh braking since the rears where fitted (I've been carefully bedding them in) but I could be wrong....

The first question I have is if it is the front discs that are causing the problem, is it wise to replace them with drilled discs rather than the standard ones bearing in mind the rears will still be standard...?

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front discs vibrating through steering or through floor rear, i would notify garage or supplier about problem and ask for warranty repair
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Our front GT disks are original and on nearly 60k miles.

Pads were changed for Performance Friction items at 20k too.
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With the GT 3.2 having the Brembo setup on the front you should be wary of caliper siezure, though you have 4 pistons on each, one of the pistons may have siezed meaning there is an imbalance of force onto one of the disks as you break, but youmust also consider the condition of the suspension components too when this happens, any 1 of the 8 bushes that mount the wishbones could be causing movement of the arms and vibrating as a result of braking. warped disks are rare due to the shear size of the things but if the hub was dirty before the disk was fitted then it would naturally be siting off kilter and causing this pulsing.
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My discs are probably very, very slightly warped too. I'm confident all the rest of the car is up to scratch. It doesn't worry me cos it's hardly noticable.

But one approach, is to have a brake specialist take the discs off and see if they are indeed warped (I presume they'd use a machine much like a wheel balancer to spin the disc to see if it's 'true' or not). If they are indeed warped, they may be able to machine them back to normal, presuming there's enough meat in them (should be, if only 4K miles). And obviously, if the discs are fine, you know the problem exists elsewhere - like the other guys have suggested, in the suspension.

If you do replace the discs, whether they are drilled or grooved, is up to you. It won't necessarily help prevent warping; in theory it might, cos they might cool better, but other factors like how much braking you do, and the quality of the metal in the discs, etc, can have an impact. Brembo offer some nice drilled discs; I personally use Tarox (non-drilled) grooved F2000 discs. On a street car (as opposed to track), I personally think such discs are mostly bling. But nothing wrong with that - if you're replacing the discs anyway, they can be similar cost to OE.

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warping is not necessarily buckled as usually thought

its a general term for high spots and low spots on surface,can be caused by bedding in
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Yeah daily traffic conditions are terrible for bedding in new cars discs or for that matter...NEW discs. You are better of modulating your braking VERY carefully with new discs intraffic or, go for a REALLY long drive down a hill at high speed and then slam on the brakes slow, then med and finally hard and agressively until the car stops adn repeat that perhaps 3 or 4 times. This is my bed-in process which creates a nice face from the deposits of the pad to that of the disc causing it to have a nice bedded surface free from the stop/start traffic conjestion that is anathema to rotors when new.

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