Swapping e92 335i front brakes to the rear

gtillz · 09-08-2015, 04:06 PM

So with my new font brakes being shipped to me I got to thinking, is it possible to swap the front calipers and rotors to the rear? Or will the brake booster not provide enough power to the rears for it to work efficiently. I'm getting the ECS big brake front kit which is 6 piston.

feuer · 09-08-2015, 06:04 PM

Quote:

Originally Posted by gtillz

is it possible to swap the front calipers and rotors to the rear?

No!

Quote:

Originally Posted by gtillz

I'm getting the ECS big brake front kit which is 6 piston.

What a waste of money that would be!

gtillz · 09-09-2015, 05:27 PM

Quote:

Originally Posted by feuer

Quote:

Originally Posted by gtillz

is it possible to swap the front calipers and rotors to the rear?

No!

Quote:

Originally Posted by gtillz

I'm getting the ECS big brake front kit which is 6 piston.

What a waste of money that would be!

That wasn't the question, was it now ...

feuer · 09-09-2015, 05:38 PM

I answered your question...

techwhiz · 09-09-2015, 07:02 PM

Quote:

Originally Posted by gtillz

That wasn't the question, was it now ...

He did answer the question.
You can't put the fronts in the rear. No go.

Tom Droze · 09-09-2015, 07:06 PM

Quote:

Originally Posted by gtillz

So with my new font brakes being shipped to me I got to thinking, is it possible to swap the front calipers and rotors to the rear? Or will the brake booster not provide enough power to the rears for it to work efficiently. I'm getting the ECS big brake front kit which is 6 piston.

Amongst the many issues you would have in swapping the front brakes to the rear is that the front brake rotors do not have emergency brake drums.

tc535i · 09-09-2015, 07:20 PM

Quote:

Originally Posted by Tom Droze

Amongst the many issues you would have in swapping the front brakes to the rear is that the front brake rotors do not have emergency brake drums.

they just use the inside of the rotor hat iirc

but it's gonna be a different diameter likely

add on the mounting issues with a completely different width rotor, caliper mounting bracket won't line up, etc

just not gonna happen, so many more issues than the brake booster

gtillz · 09-17-2015, 08:00 PM

Quote:

Originally Posted by techwhiz

Quote:

Originally Posted by gtillz

That wasn't the question, was it now ...

He did answer the question.
You can't put the fronts in the rear. No go.

Want to apologize. You're right he did answer the question and I now am educated on the matter. Much appreciated

jfranci3 · 09-21-2015, 12:06 PM

Here's the answer to your question: NO!

Here are the reasons:
1)The front brakes mechanically won't fit
2) Hydraulicly , front brakes have way more piston area. With the proportioning valving, You're probably getting 10-30% of the hydraulic fluid back there filling 70-90% more piston area, so they won't do much.
3) The fronts have 2x the pad size, so they'd be very trick to proportion right. Your rear brakes don't do much probably 10% (under hard braking) to 30% of the work. If you apply too much pressure to the rear, they'll lock instantly and you'll spin instantly - this is why cars with 2wheel abs have it in the rear. It's better to be undersized in the rear than oversized. The only cars that can use front calipers in the rear are 911s and low mid-engined long wheelbase cars - and they use SMALL front calipers in the rear.
4) THey don't have an emergency brake. THis is why you see the secondary brake on lambo rears.
5) A properly sized rear brake calliper is important for feel. Screwing this up will cause your brakes to feel like s***.
6) It'll throw your ABS, TC, and Stability Control WAY off. It'll throw your suspension tuning off.

So aside from looks, there are only HUGE negatives. Your best bet would be to get the largest OEM rear brake you can retrofit.

09-08-2015, 04:06 PM	#1
gtillz New Member 3 Rep 8 Posts Drives: e92 Join Date: Jan 2015 Location: South Florida iTrader: (0)	Swapping e92 335i front brakes to the rear So with my new font brakes being shipped to me I got to thinking, is it possible to swap the front calipers and rotors to the rear? Or will the brake booster not provide enough power to the rears for it to work efficiently. I'm getting the ECS big brake front kit which is 6 piston.
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09-09-2015, 05:38 PM	#4
feuer Major General 4289 Rep 9,224 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	I answered your question...
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09-21-2015, 12:06 PM	#9
jfranci3 Private 8 Rep 58 Posts Drives: Not yet Join Date: Jul 2012 Location: Chicago iTrader: (0)	Here's the answer to your question: NO! Here are the reasons: 1)The front brakes mechanically won't fit 2) Hydraulicly , front brakes have way more piston area. With the proportioning valving, You're probably getting 10-30% of the hydraulic fluid back there filling 70-90% more piston area, so they won't do much. 3) The fronts have 2x the pad size, so they'd be very trick to proportion right. Your rear brakes don't do much probably 10% (under hard braking) to 30% of the work. If you apply too much pressure to the rear, they'll lock instantly and you'll spin instantly - this is why cars with 2wheel abs have it in the rear. It's better to be undersized in the rear than oversized. The only cars that can use front calipers in the rear are 911s and low mid-engined long wheelbase cars - and they use SMALL front calipers in the rear. 4) THey don't have an emergency brake. THis is why you see the secondary brake on lambo rears. 5) A properly sized rear brake calliper is important for feel. Screwing this up will cause your brakes to feel like s***. 6) It'll throw your ABS, TC, and Stability Control WAY off. It'll throw your suspension tuning off. So aside from looks, there are only HUGE negatives. Your best bet would be to get the largest OEM rear brake you can retrofit.
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