[orangepeelforest]

Hey guys, I'm wanting to rack your brain to see what I am missing here.

I have a 2016 F30 340i and am in progress of doing the hybrid brake upgrade of putting M235i/M240i rear calipers on. Ive purchased the calipers and had them powder coated already.

Here is where I am having issues. I disassembled them and brought them to the powder coat place. promptly threw out the old packings and dust boots because I had new ones already on order. Upon reassembly the new o rings and dust boots are not fitting. Ive now purchased 2 different sets of caliper rebuild kits and they just are way to big.

Here is the part numbers I am using

Caliper: 20.b433.02 and 20.b434.02
rebuild kit: 15441 from Carlson as well as 15441 from auto-zone (duralast i think)

Anyone have any input on why none of these rebuild kits are working? I've got 2 more kits coming from Rock Auto (RAYBESTOS WK3318) tomorrow that I will try.

Here are some pictures

[OSUClevage]

So you're going to the 370mm front / 345mm rears?

If so, I purchased the following rebuild kits just last week and can verify that they fit perfectly:

Manufacture: Centric
Front: 143.34039 (40mm pistons)
Rear: 143.34040 (40mm pistons)

https://www.zeckhausen.com/catalog/i...5096_5774_6220

I'd also pick up a bottle of brake caliper assembly lube if you haven't already.

[orangepeelforest]

on https://www.zeckhausen.com/, I noticed that the M235i has a rebuild set that is for a 40mm piston and the 340i has 44mm rear pistons.

I can only think of two conclusions about my issue.

1: maybe the caliper was mislabeled and is actually for a different vehicle. I dont think this is the case as the seller is selling a ton of parts from a flooded 2015 M235i (I do have the VIN)

2: BMW changed the internals of the caliper from 40 to44mm pistons at some point and it hasn't been noticed. by the general public. I doubt these get rebuilt that often so this could be the case.

Anyway i found some other part numbers.

Centric 143.34040 should be for the 44mm piston rears on the 340i https://www.zeckhausen.com/catalog/p...ducts_id=16887

Centric 143.35031 should be the 40mm pistons on the rear of "?? SOME ??" M235i vehicles
Caliper rebuild kit - rear (40mm pistons) to rebuild one 2-piston caliper

It seams that Zeckhausen has the correct info even though getbmwparts.com shows the same part number for the M235i and the 340i caliper.


Jason

[orangepeelforest]

Originally Posted by OSUClevage

So you're going to the 370mm front / 345mm rears?

If so, I purchased the following rebuild kits just last week and can verify that they fit perfectly:

Manufacture: Centric
Front: 143.34039 (40mm pistons)
Rear: 143.34040 (40mm pistons)

https://www.zeckhausen.com/catalog/i...5096_5774_6220

I'd also pick up a bottle of brake caliper assembly lube if you haven't already.

im going 340(stock)/345 rear.

That part number for the rear shows 44mm pistons here https://www.zeckhausen.com/catalog/p...ducts_id=16887

I just measured my rear pistons and they are 40mm so ive got 3 different kits on order. hoping one works since im headed out of town next week and would like to get it finished before i leave.

Here is what i ordered:
Centric Parts 143.35031
Centric Parts 143.42041
RAYBESTOS WK3318

Thanks for the information.

[OSUClevage]

Originally Posted by orangepeelforest

im going 340(stock)/345 rear.

That part number for the rear shows 44mm pistons here https://www.zeckhausen.com/catalog/p...ducts_id=16887

I just measured my rear pistons and they are 40mm so ive got 3 different kits on order. hoping one works since im headed out of town next week and would like to get it finished before i leave.

Here is what i ordered:
Centric Parts 143.35031
Centric Parts 143.42041
RAYBESTOS WK3318

Thanks for the information.

Sorry, that rear (40mm) was a typo, lol. Meant 44mm. At least I got the centric part number right

[OSUClevage]

I should have just linked this thread:

https://f30.bimmerpost.com/forums/sh....php?t=1454642

[orangepeelforest]

Originally Posted by OSUClevage

I should have just linked this thread:

https://f30.bimmerpost.com/forums/sh....php?t=1454642

Thanks yeah I found your thread after I posted mine.

[johnung]

Originally Posted by orangepeelforest

Hey guys, I'm wanting to rack your brain to see what I am missing here.

I have a 2016 F30 340i and am in progress of doing the hybrid brake upgrade of putting M235i/M240i rear calipers on. Ive purchased the calipers and had them powder coated already.

Here is where I am having issues. I disassembled them and brought them to the powder coat place. promptly threw out the old packings and dust boots because I had new ones already on order. Upon reassembly the new o rings and dust boots are not fitting. Ive now purchased 2 different sets of caliper rebuild kits and they just are way to big.

Here is the part numbers I am using

Caliper: 20.b433.02 and 20.b434.02
rebuild kit: 15441 from Carlson as well as 15441 from auto-zone (duralast i think)

Anyone have any input on why none of these rebuild kits are working? I've got 2 more kits coming from Rock Auto (RAYBESTOS WK3318) tomorrow that I will try.

Here are some pictures

I've used the centric caliper rebuild kits from Zeckhausen and they fit perfectly. When in doubt, call Dave Zeckhausen. Dave is a brake guru.

[orangepeelforest]

Originally Posted by johnung

I've used the centric caliper rebuild kits from Zeckhausen and they fit perfectly. When in doubt, call Dave Zeckhausen. Dave is a brake guru.

I'll call him tomorrow to verify if what I have will fit. Going to be an expensive lesson if those calipers don't fit my car.

[OSUClevage]

My front 370mm and rear 345mm caliper piston diameters with o-ring and gasket rebuild kit parts.

[johnung]

Originally Posted by orangepeelforest

I'll call him tomorrow to verify if what I have will fit. Going to be an expensive lesson if those calipers don't fit my car.

Use the realoem website to lookup rear caliper part numbers for M Sport brakes for your car and compare to part numbers for the rear calipers that you purchased.

[orangepeelforest]

Originally Posted by johnung

Use the realoem website to lookup rear caliper part numbers for M Sport brakes for your car and compare to part numbers for the rear calipers that you purchased.

Good call, i forgot about realoem and was looking on getbmwparts.com

the part number of the M235i rear brake caliper with the 40mm piston is:
01 Caliper housing left 1 11/2012 34216860737
01 Caliper housing right 1 11/2012 34216860738

and for the 340i they are:
06 Caliper housing left 1 34216799461
06 Caliper housing right 1 34216799462

[johnung]

Originally Posted by orangepeelforest

Good call, i forgot about realoem and was looking on getbmwparts.com

the part number of the M235i rear brake caliper with the 40mm piston is:
01 Caliper housing left 1 11/2012 34216860737
01 Caliper housing right 1 11/2012 34216860738

and for the 340i they are:
06 Caliper housing left 1 34216799461
06 Caliper housing right 1 34216799462

Talk to Dave Zeckhausen. He is the best!

[orangepeelforest]

Originally Posted by johnung

Talk to Dave Zeckhausen. He is the best!

I talked to him this morning. He believes that the m235i calipers are not going work on an f30. he said that he believes the rotor offset will not be correct. When my rebuild kits come tomorrow I'll put everything together and see how/if they work.

I am hopeful but not optimistic that they will actually work with my car

[orangepeelforest]

just in case anyone is following this or runs into the same problem as me, M235 brakes will fit the f30.

I used an f30 345x24 rear rotor and m235i rear calipers. you can find the part numbers in my post above.

[thatBimmerBloke]

Originally Posted by orangepeelforest

just in case anyone is following this or runs into the same problem as me, M235 brakes will fit the f30.

I used an f30 345x24 rear rotor and m235i rear calipers. you can find the part numbers in my post above.

I've been lurking around on the 2addicts forum lately, looking for the same rear calipers to match the front brembos.

[Logicoeur]

So was anyone able to confirm the reason bmw went with a new part number for the 2piston rear Brembos? Is it real y'all just a color change?

[Polo08816]

Originally Posted by OSUClevage

So you're going to the 370mm front / 345mm rears?

If so, I purchased the following rebuild kits just last week and can verify that they fit perfectly:

Manufacture: Centric
Front: 143.34039 (40mm pistons)
Rear: 143.34040 (40mm pistons)

https://www.zeckhausen.com/catalog/i...5096_5774_6220

I'd also pick up a bottle of brake caliper assembly lube if you haven't already.

Originally Posted by orangepeelforest

on https://www.zeckhausen.com/, I noticed that the M235i has a rebuild set that is for a 40mm piston and the 340i has 44mm rear pistons.

I can only think of two conclusions about my issue.

1: maybe the caliper was mislabeled and is actually for a different vehicle. I dont think this is the case as the seller is selling a ton of parts from a flooded 2015 M235i (I do have the VIN)

2: BMW changed the internals of the caliper from 40 to44mm pistons at some point and it hasn't been noticed. by the general public. I doubt these get rebuilt that often so this could be the case.

Anyway i found some other part numbers.

Centric 143.34040 should be for the 44mm piston rears on the 340i https://www.zeckhausen.com/catalog/p...ducts_id=16887

Centric 143.35031 should be the 40mm pistons on the rear of "?? SOME ??" M235i vehicles
Caliper rebuild kit - rear (40mm pistons) to rebuild one 2-piston caliper

It seams that Zeckhausen has the correct info even though getbmwparts.com shows the same part number for the M235i and the 340i caliper.


Jason

When I DIY'd my M Sport Brake Option rebuild, I remember the rear caliper pistons being larger than the front.

[OSUClevage]

Originally Posted by Polo08816

When I DIY'd my M Sport Brake Option rebuild, I remember the rear caliper pistons being larger than the front.

Yeah, the 345 rear, 2 piston calipers use a 44mm piston.

[Logicoeur]

OP did the RAYBESTOS WK3318 kit work for you? I want to get bleeder caps in the set as well. Everywhere I look this reybestos part number lists the M3 and M4 so I know it should fit the 2pot Brembos with 44mm pistons. Just want to make sure.