Marks on rear Brake discs

[Fluff34567]

Hi, I have a 4m caravelle and noticed the rear disc braking surface is rusty on both discs. I haven't looked at the disc face thats on the inside. Faces are I would describe as glazed rust, not shining raw like the front.

Does the brake system use a shuttle valve to distribute different brake pressure front rear or is it normal ?

 

[ThreeBridgeT6]

You're clearly not driving fast enough, and braking far too early! Drive it like you stole it! Being serious however, I think that modern vehicles' systems distribute more force to the front discs as the front of the vehicle becomes heavier during braking, to avoid the rear wheels locking up and skidding. Obviously ABS will come in at this point too. Mine (not 4M) are evenly shiny, and if I ever start to drive it like I stole it, the passenger seat voice activated autopilot soon chips in!

 

[Fluff34567]

Actually it is driven rather gently hahaha will smash the brakes and see what happens

 

[Loz]

Grinding Noise From Rear Brakes

so what do you think about these. Over the last week or so I’ve noticed a grinding noise from the rear brakes (over the music) Car has done 16000 miles over 2 years - used at weekends for the first 18 months and now used most days for a 40 mile commute on the motorway Front brakes look fine...

www.t6forum.com

https://www.t6forum.com/threads/how-to-changing-rear-disks-rotors-and-pads.12710/

 

[Big Al]

Load it up in the rear..... really heavy stuff and it`ll help too. Unladen vans are all the same.

 

[Loz]

Once the rust sets in there is no real way to recover them without replacement.
I am sure that the disks I had from the factory were poor quality as the replacement Brembos are fine and I have left it standing more than ever in the last 12 month.

 

[Purdster]

Agree with that. One of the threads referenced above was mine and it’s been fine ever since - even with much less used since last March

 

[Big Al]

Once the rust sets in there is no real way to recover them without replacement.
I am sure that the disks I had from the factory were poor quality as the replacement Brembos are fine and I have left it standing more than ever in the last 12 month.

Yes, I fully understand that, it was more for light surface rust to assist in keeping it at bay. " Brake discs rusty"... its open to interpretation.

 

[Stu1974]

Does anybody know what causes these marks on the rear discs.
Can is making a grinding noise when brakes are pressed very softly.

 

[Niall.b]

think you need a set of pads by the looks of it

 

[Dellmassive]

those disc rotors look scored, lipped and pitted.

how many miles in the van?

when were rear pads/discs changed?

its normally two sets of pads per disc change (rough average)


check the pad to see how much meat left on them? . . . post a pic?

but as above, could be time for new pads and discs.

 

[Pete C]

Could just be a bit of corrosion - T6 rear discs seem to be prone to this.
I would check your pads, and if there is plenty of pad left, then do some heavy braking somewhere safe to see if the discs clean up.
It’s hard to tell from the photo how big the wear lip is.

Pete

 

[Stu1974]

I’m going Into the garage in the morning for new discs and pads. Just to be sure.
As im away for two weeks from Saturday,
What discs and pads to people recommend?

 

[JOG]

I’m going Into the garage in the morning for new discs and pads. Just to be sure.
As im away for two weeks from Saturday,
What discs and pads to people recommend?

EuroParts are usually discounting Bremo

 

[Dellmassive]

OEM or decent Patent.

I've always used Pagid . . but i have a set of Brembo to try next.


some more info:

Service Parts List - What Goes Where -

Service Parts List - What Goes Where - Here is a Basic list for all Parts required for Servicing which will be updated moving forwards: Brakes: Pads: 308mm F Pagid Brake Pad (Front Axle) Product Code: 101441298 340mm F Pagid Pagid Brake Pad (Front Axle)Product Code: 101441868 340mm F Brembo...

www.t6forum.com

.

 

[Howzat]

Brembo and some silicone grease for me = non squeaky brakes. Nothing worse than your bus actually sounding like a bus.

 

[Skyliner33]

Brembo and some silicone grease for me = non squeaky brakes. Nothing worse than your bus actually sounding like a bus.

Doesn’t putting Si grease on the discs reduce their effectiveness?

 

[Howzat]

It does but they will last longer.
Just to be clear, DON'T GREASE YOUR DISKS!!!

 

[Stu1974]

Just goes to show don’t take what they look like on the outside. Both discs binding and scored badly on inner side of disc. All new fitted now and drive alike new.

 

[DXX]

Just goes to show don’t take what they look like on the outside. Both discs binding and scored badly on inner side of disc. All new fitted now and drive alike new.

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Hopefully those pads are chipped from levering them over the lip on the disc and weren’t damaged in service?
From the photos I estimate the discs are still inside the wear limit but the corrosion pitting finally got them.