Mk4 L400 Slight Judder Under Hard Breaking

[Graham Gardner]

My mk4 has a slight judder when braking hard from speed, passenger side, I suspect that the disc is warped or the brake pads are compromised in some way, any other suggestions are welcome?

[steve2006]

Brakes would be the 1st things to check but it can be caused by suspension issues too, upper control arm balljoint, lower balljoint and other components with rubber bushes.

[Graham Gardner]

Brakes would be the 1st things to check but it can be caused by suspension issues too, upper control arm balljoint, lower balljoint and other components with rubber bushes.

Thanks, I will check the brakes first. Can you correct my spelling mistake in the title please?

[plastic orange]

Discs don't last too long, so I'd suggest you have a warped one. My car appears to need discs every 20k according to it's history file. I've replaced 2 sets in my ownership so far - starts off with a mild shake on light braking, developing more as mileage increases. Hard braking seemed fine though.

Pete

[Malc]

Wow, can't understand why your car needs new discs every 20k miles. Mine seem everlasting ( almost )

Malc

[Graham Gardner]

Discs don't last too long, so I'd suggest you have a warped one. My car appears to need discs every 20k according to it's history file. I've replaced 2 sets in my ownership so far - starts off with a mild shake on light braking, developing more as mileage increases. Hard braking seemed fine though.

Pete

That's exactly how my 400 behaves, thanks Pete

[Graham Gardner]

I'll start by replacing the discs, where the best place to get them, might as well do the pads and the calliper seals?

[plastic orange]

I've had Lexus and blueprint discs - both lasted the same time. I'm trying pagid parts this time.

Pete

[Graham Gardner]

I've had Lexus and blueprint discs - both lasted the same time. I'm trying pagid parts this time.

Pete

Ordered a set, discs and pads, off Pagid from Europarts £132 all in, not bad, just got to get my brother to 'volunteer' to fit them

[plastic orange]

They are very easy to fit and you'll notice an improvement immediately. The pagid discs seem pretty good so far - done about 2,000 miles so far. I used Ferodo premium pads though.

Pete

[Graham Gardner]

They are very easy to fit and you'll notice an improvement immediately. The pagid discs seem pretty good so far - done about 2,000 miles so far. I used Ferodo premium pads though.

Pete

I fitted the Pagid discs, brake sensor and pads, the juddering has gone, phew!

Strangely though, the offside disc had been fitted, WITHOUT the two retaining screw, they had been sheared off! The car has a full service history, I have have found a receipt for the disc and their fitting from two years ago by a motor engineer company in Glasgow, to be honest, I'm appalled that a reputable company should have done such a shoddy repair. I have drilled the studs out and recut the threads, it took me about half an hour, this is exactly why I now do all my own repairs and servicing (with help and guidance from my brother, a trained Jaguar engineer) you seemingly can't trust anyone?

[plastic orange]

My lexus doesn't have the locating bolts either (not sure if any were actually fitted originally) - and it was serviced by Lexus until I got it. I never bothered though as the wheel clamps things tight.

Glad you're sorted for another few miles as you'll be re-visiting this again.

Pete

[Graham Gardner]

My lexus doesn't have the locating bolts either (not sure if any were actually fitted originally) - and it was serviced by Lexus until I got it. I never bothered though as the wheel clamps things tight.

Glad you're sorted for another few miles as you'll be re-visiting this again.

Pete

What, the brakes?

[plastic orange]

Unfortunately they don't last too long. Hopefully the Pagid parts will last longer than the 20k of Lexus or Blueprint parts.

Pete

[Graham Gardner]

Unfortunately they don't last too long. Hopefully the Pagid parts will last longer than the 20k of Lexus or Blueprint parts.

Pete

I've been reading about that but that's fine, I only do around 5k miles a year in the LS400, that'll be 4 years from now

[Keynsham1]

Could a shudder be caused by the rear brakes? I had the same symptoms and replaced the front discs and pads. It didn't really solve the problem but I know the rears are pretty shot. I will check the run out of the fronts first as I remember that there is a very tight tolerance of around 0.002"