4 Piston Big Brake Upgrade from 2019-20

[fasteddy]

Another point to consider is the spare tire, as you probably don't want to lug one around that doesn't fit the front after the brake install.

 

[corvette744]

Another point to consider is the spare tire, as you probably don't want to lug one around that doesn't fit the front after the brake install.

I no a 33 inch goodyear duratrac will fit but you have to cut the rear of the hitch receiver just a tad.Its tight but does fit.I made 2 cuts one shown and then an angled one for easy up with the hoist so it falls in.

 

[91RS]

We're just working on the fronts right now.
We've had some successful test fits, constrained by 19+ silverado wheels, but no rolling installs yet reported here.
Mine will be soon, just waiting on wheels.

I installed the 21 brakes on a friend's 2005 RCSB. He's been driving it for 6 months or so. A guy he knows also has them on his 03.

Another point to consider is the spare tire, as you probably don't want to lug one around that doesn't fit the front after the brake install.

You just put the spare on the rear and then the wheel from the rear on the front if you have a flat on the front.

 

[Dantheman1540]

Another point to consider is the spare tire, as you probably don't want to lug one around that doesn't fit the front after the brake install.

Or don't carry a spare and have AAA

 

[Dantheman1540]

I have the test caliper from @1BADI5 coming so I will test the common NNBS LTZ20s with and without spacers. I'd test other stuff but all the other wheels I have are 17"s and I don't think a 17" will clear at all.

Anybody near central Florida that wants the test caliper when I'm done?

 

[1BADI5]

I have the test caliper from @1BADI5 coming so I will test the common NNBS LTZ20s with and without spacers. I'd test other stuff but all the other wheels I have are 17"s and I don't think a 17" will clear at all.

Anybody near central Florida that wants the test caliper when I'm done?

Should work with 17's, it was going to work with my PPV wheels with the appropriate spacer

 

[Dantheman1540]

Should work with 17's, it was going to work with my PPV wheels with the appropriate spacer

Oh, I didn't realize that, I thought I saw somewhere that an 18" was the minimum. I'll test with my Methods, PPVs, and OEM NBS denali wheels then! The more info the better might need to start a thread about what is confirmed to fit.

 

[the_tool_man]

Another point to consider is the spare tire, as you probably don't want to lug one around that doesn't fit the front after the brake install.

You can always get a cheap, curbed wheel to carry under there. Back when I had drop spindles on my Expedition (requiring 18" wheels), I couldn't find an 18" spare to fit the metric bolt pattern they used on the '97-02s. So since I had Lightning wheels on the Expy, I bought a curbed Lightning wheel on eBay for less than $100, and mounted one of my old tires on it as a spare. Turns out I never needed it. But I sure didn't want to make a roadside flat twice as bad by having to change two tires.

 

[1BADI5]

Oh, I didn't realize that, I thought I saw somewhere that an 18" was the minimum. I'll test with my Methods, PPVs, and OEM NBS denali wheels then! The more info the better might need to start a thread about what is confirmed to fit.

Hell yeah man, I remember doing all of this on the GMT355 platform (04-12 Chevy Colorado) buying parts and test fitting, confirming, denying or developing solutions to make something work.

Let me know if you need anything. BTW I left some spare caliper bolts and some washer/spacers on there for you're testing pleasures LOL

 

[Dantheman1540]

Hell yeah man, I remember doing all of this on the GMT355 platform (04-12 Chevy Colorado) buying parts and test fitting, confirming, denying or developing solutions to make something work.

Let me know if you need anything. BTW I left some spare caliper bolts and some washer/spacers on there for you're testing pleasures LOL

Oh baby that .69 really helped

 

[1BADI5]

Oh baby that .69 really helped

Absolutely.......a little .69 goes a long ways

Just remember, if it fits, it ships LMAOP

 

[Dantheman1540]

Absolutely.......a little .69 goes a long ways

Just remember, if it fits, it ships LMAOP

View attachment 276495 View attachment 276496

That is good looking packaging, the next person best not expect that from me

Nice work bench setup btw!

 

[1BADI5]

That is good looking packaging, the next person best not expect that from me

Nice work bench setup btw!

Thanks homie, its a simple packing job.

That is good looking packaging, the next person best not expect that from me

Nice work bench setup btw!

Thanks homie.

That packing job is easy.

 

[fasteddy]

Oh, I didn't realize that, I thought I saw somewhere that an 18" was the minimum. I'll test with my Methods, PPVs, and OEM NBS denali wheels then! The more info the better might need to start a thread about what is confirmed to fit.

My 05 Z71 wheels - 17" - cleared, that is the barrel cleared over the caliper and rotor....
It just needed a little spacer to push it out a bit.....
I just don't like using spacers because you lose thread on the stud....

 

[Dantheman1540]

My 05 Z71 wheels - 17" - cleared, that is the barrel cleared over the caliper and rotor....
It just needed a little spacer to push it out a bit.....
I just don't like using spacers because you lose thread on the stud....

Yeah, I'm not a huge fan of the small spacers that make you lose threads, although I did run them for over a year and 30kish miles without any issues. Tires shops didn't even give me a hard time. I think it would be worth it for the bigger brakes, for my application at least.

 

[fasteddy]

Yeah, I'm not a huge fan of the small spacers that make you lose threads, although I did run them for over a year and 30kish miles without any issues. Tires shops didn't even give me a hard time. I think it would be worth it for the bigger brakes, for my application at least.

Your application?
Just downshift and let out the clutch.....LOL

I should have measured, with washers, how much of a spacer my Z71 would need.
It was close.

It's probably the same for all of the pre-19 or pre-caliper wheels....

 

[Dantheman1540]

Your application?
Just downshift and let out the clutch.....LOL

I should have measured, with washers, how much of a spacer my Z71 would need.
It was close.

It's probably the same for all of the pre-19 or pre-caliper wheels....

Compression braking always works but brakes are cheaper/easier to replace than a clutch. Also I find the current Powerstop kit to work fantastic with the factory hydroboost but, I push the limits of this platform towing since I have the power, gearing, and suspension to do so. What's lacking is most certainly the brakes when loaded over 6k or so, especially on a trailer with no brakes like all mine are lacking .

One day I'll upgrade to a 20' equipment trailer with big boy axles, disc brakes, and a brake controller in the hoe. That ain't gonna be anytime soon!

 

[fasteddy]

Off the subject.....totally
What do you tow around?

You need to do the duramax swap with Allison 6speed. Easier swap on the H2's as they are built on a 2500 chassis.
I've seen a Tahoe done, just one, but you have get a totally different rear diff.

I'm on the fence about this one......but still might do it.
Linex'd body though, maintenance issue I think. But 1000lbs of torque on high and tuned down gets 20MPG.
Tunes can be swapped on the fly. Don't you wish you could do that on your Tahoe?

 

[Rocket Man]

For some reason I thought these had bigger rotors than 13.5”. It’s been awhile since I messed with the NNBS swap on my NBS but weren’t they 13”? 13.5 doesn’t scream BBK to me like the 16” Wilwoods I have do. But for the price it’s great for sure. This needs to be the go-to for guys swapping the NBS instead of going to NNBS. Great info guys, keep testing and adding data.

 

[treehan77]

I believe w elbow the gmt800/NBS has better rears anyway than the gmt900/Nnbs but beyond that I dunno