Blue 4/2 Pot Caliper Torque Specs

[Zoomz_7]

I plan on tackling disassembly of the Brembo calipers in order to prep them for powder coating. Now the only issue is I’m not sure of the torque specs. On similar Brembos (evo and sti) forums claim 80ft/lbs, 33ft/lbs, and 125ft/lbs. What would the torque be for our bolts that hold the two halves? When it comes to something like this, last thing I want is a leaking caliper or snapped bolts.

[ErikB]

not sure if you ever found your answer, but keep in mind that these are probably M8 or M10 e-torx bolts threading into aluminum. I searched around too and I see numbers that vary based on the length & diameter of the bolts, thread depth, as well and if the caliper has o-ring seals or just two flat face mating. take these as reference, not the actual number but should ballpark you.
https://rennlist.com/forums/964-foru...ml#post2334852

https://forums.nicoclub.com/caliper-....html#p6820488

just remember, the 70ft lbs some guys state seems pretty high. No way its going to be over 100.

I would scribe a bolt had to the body, a clocking mark. Loosen one and then use a torque wrench to move it back, might take a few tries but see if you can zero in on the setting. Start at 25ftlbs, if the wrench clicks/beeps before you clock back to the right position, then you exceeded, if not, raise it in 5lb increments. Hopefully that makes sense. I didnt see any exact calipers being discussed and since it varies based on several factors, just try and find it slowly.

[Zoomz_7]

Originally Posted by ErikB

not sure if you ever found your answer, but keep in mind that these are probably M8 or M10 e-torx bolts threading into aluminum. I searched around too and I see numbers that vary based on the length & diameter of the bolts, thread depth, as well and if the caliper has o-ring seals or just two flat face mating. take these as reference, not the actual number but should ballpark you.
https://rennlist.com/forums/964-foru...ml#post2334852

https://forums.nicoclub.com/caliper-....html#p6820488

just remember, the 70ft lbs some guys state seems pretty high. No way its going to be over 100.

I would scribe a bolt had to the body, a clocking mark. Loosen one and then use a torque wrench to move it back, might take a few tries but see if you can zero in on the setting. Start at 25ftlbs, if the wrench clicks/beeps before you clock back to the right position, then you exceeded, if not, raise it in 5lb increments. Hopefully that makes sense. I didnt see any exact calipers being discussed and since it varies based on several factors, just try and find it slowly.

Makes sense. I should of tried that before splitting them. I ended up doing 55 ft/lbs front and 30 ft/lbs rear. Most popular torque on similar STI and Evo Brembos. Hopefully they don’t leak I want to try out these new stainless steel pistons.

[bimmerlyfe]

I’m getting my brake calipers powder coated and I’m trying to find the same information. I already split my calipers or else that advice would have been a pretty good idea.

Can someone provide an update if they know the factory torque specs? Or Zoomz can you tell us how your brakes are holding up with the 55/30 torques you used?

Did you use any thread locker? I’m thinking I probably will.

[Zoomz_7]

Originally Posted by bimmerlyfe

I’m getting my brake calipers powder coated and I’m trying to find the same information. I already split my calipers or else that advice would have been a pretty good idea.

Can someone provide an update if they know the factory torque specs? Or Zoomz can you tell us how your brakes are holding up with the 55/30 torques you used?

Did you use any thread locker? I’m thinking I probably will.

The calipers are holding up great with no leaks. I used red threadlocker. Although I snapped my rear brake hard lines during the DIY (seized nuts on the hard lines) and they got replaced by a shop. I asked them to double check my torque on the caliper halves and they reported saying the calipers are fine. When I asked what they checked them to, they could not tell me. All Data and BMW show the calipers are not serviceable. The shop had a contact at Brembo who apparently had those specs.

[uncle ben]

Do you happen to have the old pistons laying around? I’m interested in getting measurements.

[Zoomz_7]

Originally Posted by uncle ben

Do you happen to have the old pistons laying around? I’m interested in getting measurements.

According to RB Performance:
(I bought the stainless steel pistons from here)
Front 40x32.5
Rear 44x32.5

Oem pistons don’t have any markings if I recall correctly.

[uncle ben]

I was curious about the location of the brake seal cutout, and position on the piston.