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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > What front brake Part Number



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      02-03-2021, 08:32 AM   #1
Geo248
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Hi all,

Got a judder under braking, and I believe that my front rotors are warped. This is on a 2007 325d touring.

I'm currently looking to buy some replacement disc rotors, and real OEM is throwing up two part numbers (see below). Would I only be looking at the 300x24 part number, or am I reading this all wrong?

On a side note, if anyone knows a good place to buy replacements, I'd be grateful!

Thanks all!
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      02-03-2021, 08:43 AM   #2
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Post a picture of your front calipers; thats the easy way to tell.

but the 330x24 is likely the one. the 348s are the utility option (special rough road package, police or fleet vehicles etc)
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      02-03-2021, 10:22 AM   #3
edycol
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Quote:
Originally Posted by neilvan View Post
Post a picture of your front calipers; thats the easy way to tell.

but the 330x24 is likely the one. the 348s are the utility option (special rough road package, police or fleet vehicles etc)
348x30 are front rotors on 335i, 335d
330x34 are rear rotors on 335i and 335d
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      02-03-2021, 10:44 AM   #4
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Quote:
Originally Posted by edycol View Post
348x30 are front rotors on 335i, 335d
330x34 are rear rotors on 335i and 335d
The car in question is a 325d and for front rotors only. Europe had different options than we did and those are the 2 sizes listed by realoem as shown

Also the rear rotors for north american 330/335i and d are 336 x 22. 330x24 front rotors we had on the 330i (and z4/x1)
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      02-03-2021, 10:48 AM   #5
edycol
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Quote:
Originally Posted by neilvan View Post
The car in question is a 325d and for front rotors only. Europe had different options than we did and those are the 2 sizes listed by realoem as shown

Also the rear rotors for north american 330/335i and d are 336 x 22. 330x24 front rotors we had on the 330i (and z4/x1)
You are right, 330x24 was front on 330i.
325d will have smaller rotor that can fit 16" wheel which was base wheel for numerous models in Europe. So 2007 will probably be 300x24.
I worked on some acquisition of police vehicles in Europe (330d among them) and BMW's already have brakes that are track ready or heavy duty ready, so no change there.
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      02-03-2021, 03:29 PM   #6
Guy Fieri
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E90 LCI 328i  [5.00]
330x24mm rotors most likely, but you can verify if you look at the stampings on your caliper.

Eg: 57/24/300 = 300mm diameter, 24mm thickness
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      02-03-2021, 09:51 PM   #7
edycol
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This web site has both 348mm and 330mm:
https://www.onlinecarparts.co.uk/car...isc.html#10106
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      02-04-2021, 06:29 AM   #8
Geo248
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Thanks for all your help on this! I'll check the calliper when I'm out of work and see. I had a hunch it would be 300x24, but couldn't work out if the alternative part number was for an option at purchase.
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      02-04-2021, 11:36 AM   #9
edycol
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Quote:
Originally Posted by Geo248 View Post
Thanks for all your help on this! I'll check the calliper when I'm out of work and see. I had a hunch it would be 300x24, but couldn't work out if the alternative part number was for an option at purchase.
It could be.
I owned E61 525d, 197hp version. It is heavy engine, so I would not be surprised if you have larger rotors, 330mm version possibly. 300 was coming on 325i, US specs. 325, 328 etc. 330i in US was coming with 330mm rotors. So, due to weight of 325d, I would not be surprised if you have bigger rotors.
One way to figure out that is whether you car has an option to fit 16 inch wheels. If you manual has listed only 17, 18 and 19 inch options, you have larger rotors as 16 inch wheels cannot be fitted on 330mm rotors.
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