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#4539116 - 10/10/17 01:22 PM New Brake Discs Thickness issue
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
hey all i forgot to take a photo but will get one up tomorrow. the new brake discs i received (vented ones) have a thicker plate on one side and thinner on the other. is this normal or a manufacturing issue? its the same on both of the discs in the box.
iv seen this on some pagid discs for the aygo and its now happened with the fremax discs i bought for the ford fiesta.
how can this happen from 2 different brands of discs for different cars?

i thought with brake discs the plates should be even thickness on each side?
_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4539119 - 10/10/17 01:28 PM Re: New Brake Discs Thickness issue [Re: slybunda]
The Critic Offline


Registered: 08/30/04
Posts: 19802
Loc: CA
This is normal- some applications will have one side that is thicker than the other.
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#4539175 - 10/10/17 02:24 PM Re: New Brake Discs Thickness issue [Re: slybunda]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2038
Loc: Slovenia
Never seen discs like that.... They must be even on both sides...
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#4539180 - 10/10/17 02:30 PM Re: New Brake Discs Thickness issue [Re: The Critic]
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
Originally Posted By: The Critic
This is normal- some applications will have one side that is thicker than the other.


Thats odd would it cause vibration or other issues?
_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4539227 - 10/10/17 03:14 PM Re: New Brake Discs Thickness issue [Re: slybunda]
Char Baby Offline


Registered: 05/25/05
Posts: 10020
Loc: ROCHESTER, NY
I have rotors like that. I believe(I'd have to look) the inside(piston side) is thicker than the outside.
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#4539240 - 10/10/17 03:27 PM Re: New Brake Discs Thickness issue [Re: slybunda]
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
I just checked and yes the caliper piston side is thicker. Very odd
_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4539246 - 10/10/17 03:32 PM Re: New Brake Discs Thickness issue [Re: slybunda]
Dave9 Offline


Registered: 08/28/17
Posts: 176
Loc: Cincinnati, USA
Check your old rotors. If they wore evenly on both sides then unequal thickness replacements will have a shorter service live. If they wore more on the piston side then that would suggest the new ones are Just Right for the application.

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#4539260 - 10/10/17 03:41 PM Re: New Brake Discs Thickness issue [Re: slybunda]
LeakySeals Offline


Registered: 02/18/11
Posts: 6568
Loc: Hudson, NH
pics?
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#4539334 - 10/10/17 04:29 PM Re: New Brake Discs Thickness issue [Re: slybunda]
PandaBear Offline


Registered: 08/05/02
Posts: 14215
Loc: Silicon Valley
It actually make sense as the piston side is more likely to wear out faster, especially if they use different material between inside (more bite) and outside (low dust).
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#4539763 - 10/11/17 02:51 AM Re: New Brake Discs Thickness issue [Re: slybunda]
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
iv attached some pics. overall disc thickness iv measured with the vernier caliper is 20mm at different points so it is in spec for overall thickness. however one plate is around 7.4mm thick and the other plate is around 6.5mm thick.
the plate thats caliper piston side is the thicker one.


_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4541040 - 10/12/17 09:36 AM Re: New Brake Discs Thickness issue [Re: slybunda]
WyrTwister Offline


Registered: 01/13/13
Posts: 1516
Loc: Texas
Never seen that either .

Are you saying one side of the rotor is thicker than the other ?

Wyr
God bless
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Wyr
God bless

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#4541060 - 10/12/17 10:05 AM Re: New Brake Discs Thickness issue [Re: slybunda]
UG_Passat Offline


Registered: 05/27/08
Posts: 1970
Loc: NJ
Considering that most cars uses 1-piston calipers, being thicker on the piston side makes sense, provided that the rotors are balanced properly at the factory
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#4541403 - 10/12/17 05:31 PM Re: New Brake Discs Thickness issue [Re: WyrTwister]
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
Originally Posted By: WyrTwister
Never seen that either .

Are you saying one side of the rotor is thicker than the other ?

Wyr
God bless


yes one side is thicker
_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4541417 - 10/12/17 05:57 PM Re: New Brake Discs Thickness issue [Re: slybunda]
WyrTwister Offline


Registered: 01/13/13
Posts: 1516
Loc: Texas
Wondering it was intended to be that way or if the center line of the casting is off ?

That way on both sides of the car ?

Best wishes , :-)
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Wyr
God bless

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#4541784 - 10/13/17 01:46 AM Re: New Brake Discs Thickness issue [Re: WyrTwister]
user52165 Offline


Registered: 10/21/11
Posts: 1331
Loc: CA
All you guys saying you never saw this either:

Have not seen many different model discs, or

Saw it but didn't pay attention and did not notice. Not a huge difference but always measureable.

Very common and also very common that pads do not wear evenly inner vs outer.

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