4 Piston Big Brake Upgrade from 2019-20

[SRQYukon]

Dont know if I could sleep at night if I had plastic caliper covers.

MGP has powder-coated aluminum for Tahoe/Yukon, but they're still a little cheesy and expensive, like

 

[Rocket Man]

Just say no to caliper covers. And yes the NBS larger dual piston rear calipers fit the NNBS. Before this latest mod, it was known to to be the best OEM setup by running the NNBS fronts with the NBS rears- best of both worlds. But now it seems the best setup would be the 2019-2020 fronts with the 00-06 rears. Everything is interchangeable with the exception of wheel issues with these 19-20’s.

 

[SRQYukon]

Nooooo!

 

[ks03]

For whatever reason I never cared much what the calipers look like, I always thought big rotors make it sexy.

 

[Dantheman1540]

Just say no to caliper covers. And yes the NBS larger dual piston rear calipers fit the NNBS. Before this latest mod, it was known to to be the best OEM setup by running the NNBS fronts with the NBS rears- best of both worlds. But now it seems the best setup would be the 2019-2020 fronts with the 00-06 rears. Everything is interchangeable with the exception of wheel issues with these 19-20’s.

I think they were discussing if the NBS 2 piston calipers would fit over a NNBS 13.5" rotor.

 

[joeg]

Can someone measure the barrel clearance needed to fit the 4pot calipers? I know it's probably a longshot, but I'm wondering if you could clear the barrel in an aftermarket 16" wheel. They're -12 offset, so I'm not worried about the width.

 

[Dantheman1540]

On my recent road trip, I was brainstorming about possible rear upgrades and might have come up with something worth checking into. Hummer H@s came with NBS front calipers on their rear axles but a custom 8lug rotor. The rear axle on an H2 is a 9.5sf 14bolt but has a little bigger shafts, and outer bearings (I think that's the main difference). If an NBS front caliper fits on an H2 9.5sf then it might fit an AXN 9.5sf that comes in the NNBS 6.2/2wd trucks which happen to come with 13.5" rotors in the rear.

What else has a 13.5" rotor? Oh yeah the T1 4 piston calipers this post is dedicated to are designed for a 13.5"rotor. So maybe just maybe we could put a T1 4piston caliper and pads on an NNBS 13.5" rear rotor on the back of an NBS rig while retaining the parking brake and have it all bolt up with no more than a simple washer to space it.

Obviously, this has not been put together in person I'm just spitballing and seeing what yall think.

Another issue everybody likes to bring up when talking about brakes is bias, with nearly identical braking power front>rear I would assume the rear would be more likely to lock up. I do know the NBS ABS is fairly good and may be able to overcome this but if not a proportioning valve would be needed.

 

[George B]

On my recent road trip, I was brainstorming about possible rear upgrades and might have come up with something worth checking into. Hummer H@s came with NBS front calipers on their rear axles but a custom 8lug rotor. The rear axle on an H2 is a 9.5sf 14bolt but has a little bigger shafts, and outer bearings (I think that's the main difference). If an NBS front caliper fits on an H2 9.5sf then it might fit an AXN 9.5sf that comes in the NNBS 6.2/2wd trucks which happen to come with 13.5" rotors in the rear.

What else has a 13.5" rotor? Oh yeah the T1 4 piston calipers this post is dedicated to are designed for a 13.5"rotor. So maybe just maybe we could put a T1 4piston caliper and pads on an NNBS 13.5" rear rotor on the back of an NBS rig while retaining the parking brake and have it all bolt up with no more than a simple washer to space it.

Obviously, this has not been put together in person I'm just spitballing and seeing what yall think.

Another issue everybody likes to bring up when talking about brakes is bias, with nearly identical braking power front>rear I would assume the rear would be more likely to lock up. I do know the NBS ABS is fairly good and may be able to overcome this but if not a proportioning valve would be needed.

The only experience with bias was when I gutted a proportioning valve on an 82 Caprice. It had closer to 50/50 bias and would stop ok but there was very little weight transfer to the fronts and steering suffered under even moderate braking if you needed to steer or corner. Might not be apples to apples but maybe the physics apply.

 

[SRQYukon]

On my recent road trip, I was brainstorming about possible rear upgrades and might have come up with something worth checking into. Hummer H@s came with NBS front calipers on their rear axles but a custom 8lug rotor. The rear axle on an H2 is a 9.5sf 14bolt but has a little bigger shafts, and outer bearings (I think that's the main difference). If an NBS front caliper fits on an H2 9.5sf then it might fit an AXN 9.5sf that comes in the NNBS 6.2/2wd trucks which happen to come with 13.5" rotors in the rear.

What else has a 13.5" rotor? Oh yeah the T1 4 piston calipers this post is dedicated to are designed for a 13.5"rotor. So maybe just maybe we could put a T1 4piston caliper and pads on an NNBS 13.5" rear rotor on the back of an NBS rig while retaining the parking brake and have it all bolt up with no more than a simple washer to space it.

Obviously, this has not been put together in person I'm just spitballing and seeing what yall think.

Another issue everybody likes to bring up when talking about brakes is bias, with nearly identical braking power front>rear I would assume the rear would be more likely to lock up. I do know the NBS ABS is fairly good and may be able to overcome this but if not a proportioning valve would be needed.

Has anyone tried a Wilwood master cylinder with the 2019-20 setup to see if it would provide better bias balance? Does it have a larger fluid reservoir?

 

[Dantheman1540]

So far nobody has seemed to need one, I certainly don't feel it would be necessary with my current setup of T1 4pot upfront and NBS 2pot in the rear.