Judder under braking

Hi, after some advice please. I’ve put down a deposit on a 20vt6. On the test drive there was mega judder under braking. Felt like warped discs, but Is there anything else that can cause this on a coupe? It’s fitted with mtech grooved discs.

I agreed to buy subject to this being resolved, but the seller has offered a price reduction without changing the discs or pads as his garage couldn’t get hold of the parts in time. That’s my fault as I asked to collect on Easter Monday.

I have the same issue on mine - when I have not driven enthusiastically for a while...

My discs are exactly the same too.

A fast drive with lots of braking hard and hey presto the judder is gone.

Thanks, I did wonder if it might be glazed pads. I believe the car has been extensively tracked prior to being bought last year, so possibly might not have been driven enthusiasticly enough.

Also think it might have a cracked manifold, as was ticking when cold.

That is the give away of a crack for sure - could you see any white residue on the manifold or was the heat shield still in place?

Heat shield was still in place so couldn’t see the manifold.

Good luck with this one and looking forward to updates over the weekend

I’m a sucker for blue, so it’s a foregone conclusion!

Me too, having 2 Porto and a Blitz

Whilst the brakes have a judder, do they have any bite?
I have the MTEC discs and my biggest complaint is the lack of feel and bite, rather than necessarily their stopping power.
Like your judder, that may be more a pad issue than the discs?

The judder can be build up of pad material on the disc which clears under repeated hard braking - just don't stop completely when you are in this process. A dual carriage way late at night is a good place to do this.

Have a read of this guide for cleaning the brakes.

Thanks Gunzi, I’ll give that a try when I pick it up.

Has picking your new coupe up and "testing" the brakes cured the issue?

I bang on about this often but....have you checked the tyre pressures?

Hope its resolved.

MM

I haven’t had chance to do any heavy braking yet, but I’ll be checking tyre pesssures and swapping wheels front to rear as I think I’ve got a bent wheel.