P38. Odd rear brake disc wear.

allanw · Mar 5, 2021

Hi all. I wondered if anyone has seen an odd wear pattern on rear discs where the pads are only acting on the outer half inch surface of the disc? They are new discs and pads. Pistons and sliders are free. It's like the discs are thicker on the outside edge than the rest of the friction surface? I have never seen this before.

pwood999 · Mar 5, 2021

Sliders could be too free?

Are pads correct way up ? Depends on make but some are different inside & outside the disc.

https://www.ferodo.co.uk/blog/directional-brake-pads.html

Or
https://www.delphiautoparts.com/gbr/en/resource-center/fitting-directional-brake-pads-right-way

allanw · Mar 5, 2021

pwood999 said:
Sliders could be too free?

Are pads correct way up ? Depends on make but some are different inside & outside the disc.

https://www.ferodo.co.uk/blog/directional-brake-pads.html

Or
https://www.delphiautoparts.com/gbr/en/resource-center/fitting-directional-brake-pads-right-way

Pads just standard mintex .In fact they are the second new set I have tried in case the first ones were not flat.

pwood999 · Mar 5, 2021

But do 2 of the 4 have the C shape cutout in the metal backplate?

It changes the pad to disc angle to reduce wear & squeal.

allanw · Mar 5, 2021

pwood999 said:
But do 2 of the 4 have the C shape cutout in the metal backplate?

It changes the pad to disc angle to reduce wear & squeal.

No cut outs. No mention on the box either.

pwood999 · Mar 5, 2021

Is there any wobble on the sliders ? Or perhaps they are bent ?

allanw · Mar 5, 2021

pwood999 said:
Is there any wobble on the sliders ? Or perhaps they are bent ?

All seemed ok but I will check again tomorrow. Thanks all.

Grrrrrr · Mar 5, 2021

allanw said:
Hi all. I wondered if anyone has seen an odd wear pattern on rear discs where the pads are only acting on the outer half inch surface of the disc? They are new discs and pads. Pistons and sliders are free. It's like the discs are thicker on the outside edge than the rest of the friction surface? I have never seen this before.

Both sides of the disc?

Can you get a Vernier guage and see if the disc is the same thickness all the way?

P38. Odd rear brake disc wear.

allanw

Active Member

pwood999

Well-Known Member

allanw

Active Member

pwood999

Well-Known Member

allanw

Active Member

pwood999

Well-Known Member

allanw

Active Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

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