allanw

Active Member

• Mar 5, 2021

• #1

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

Well-Known Member

Full Member

• Mar 5, 2021

• #2

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

Active Member

• Mar 5, 2021

• #3

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

Click to expand...

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

 

pwood999

Well-Known Member

Full Member

• Mar 5, 2021

• #4

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

Active Member

• Mar 5, 2021

• #5

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.

Click to expand...

No cut outs. No mention on the box either.

 

pwood999

Well-Known Member

Full Member

• Mar 5, 2021

• #6

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

 

allanw

Active Member

• Mar 5, 2021

• #7

pwood999 said:

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

Click to expand...

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

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

• Mar 5, 2021

• #8

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.

Click to expand...

Both sides of the disc?

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