4 Piston Big Brake Upgrade from 2019-20

[1BADI5]

Who knows... I was just thinking outloud.

It's all good man. Nothing wrong with discussion here

 

[fasteddy]

It's all good man. Nothing wrong with discussion here

I agree.....
I could be shaving off critical mass that was engineering into the part for rigidity and heat transfer.
The thing may flex and crack or break under stress while coming down a hill, I could lose brakes and have an offroad excursion.

I would've much preferred to be through functional testing, low speed, high speed, stopping distance, by now, as opposed to working on
"cosmetics".

Its easy to pull the caliper and dress it up after testing as braking is a safety function....pretty is secondary.

I did buy some hardened washers to use as opposed to the home depot .25 cent ones.

 

[AN292]

No chance the OEM spare will fit these in an emergency tire change right? I have 1" spacers.

 

[fasteddy]

No chance the OEM spare will fit these in an emergency tire change right? I have 1" spacers.

Didn't you buy the brake kit?
I would think 1" would be more than enough to fit stock wheels including the spare, but I don't know for sure.
You should test fit it.....it only took me like 45 minutes. Two caliper bolts and tuck the existing caliper up on the control arm without disconnecting it.
I just didn't have a spacer to fully test my 04 Z71 wheel. The 17" wheel clears, it just wouldn't go flush against the rotor.

I bought a 2020 silverado spare and tire off craigslist for $50.

If my wheels don't come in soon, I'm just going to buy a 1" spacer and run wide in the front until they come in.
I just didn't want the spacer to potentially interfere with testing....Like creating vibration, or imbalance.


45 mins will answer your question
See my existing caliper just tucked up on the control arm
2 bolts, slide it off, take off rotor
put on new rotor and bolt up new caliper. without pads is easier.
bolt on spacer
put on wheel, spare....see if its fits.
maybe yours is 60 mins with taking the spacer off and on.




You don't even have to remove the existing rotor or the spacer.
You're just testing for caliper clearance on your wheel and spare.
Just remove the existing caliper...tuck it up and away
Bolt on new caliper over existing rotor....space with washers if desired
Test fit wheels.
Easy Peasy.

 

[fasteddy]

Just for reference
The 18 silverado spare has circular holes
The 19 silverado spare has triangular holes

2018


2019

 

[AN292]

Thanks for that info man. I just ordered the rotors today. Has anyone installed them yet and came back with a report on their performance?

 

[Dantheman1540]

Someone really needs to come up with a rear setup that matches this front, if I'm gonna do it I want to powder my calipers and can't have mismatched front to rear.

 

[FrankU]

Dan , PLUS these vehicles could use a bit more bias on the rear brakes. I could never get used to the nose dive these vehicles take due to the lack of rear brake bias.

 

[mattbta]

Really curious if the caliper will clear this wheel on my Tahoe -- it's from an '18 Silverado. Noticed it has 28mm offset...or at least that's the number on the backside.

 

[91RS]

Someone really needs to come up with a rear setup that matches this front, if I'm gonna do it I want to powder my calipers and can't have mismatched front to rear.

I swear I remember people talking about converting to the GMT-800 2 piston rear calipers years ago but couldn’t find anything on it when I looked last night before I ordered the red Power Stop calipers to match my Brembos. All that came up was converting the 800 to the 900 front brakes. There’s different rear calipers on the the 800 depending on 2WD or 4WD and I’m not sure if the parking brake is the same where the 800 rear rotor would just drop on so I wouldn’t want to blindly order parts. The bracket bolt spacing could be different, too.

 

[Dantheman1540]

Dan , PLUS these vehicles could use a bit more bias on the rear brakes. I could never get used to the nose dive these vehicles take due to the lack of rear brake bias.

Maybe I'm used to it or my suspension minimizes the nose dive but I don't think it's too bad. probably terrible compared to a car but my Tacoma always seems looser than my tahoe.

 

[mattbta]

I swear I remember people talking about converting to the GMT-800 2 piston rear calipers years ago but couldn’t find anything on it when I looked last night before I ordered the red Power Stop calipers to match my Brembos. All that came up was converting the 800 to the 900 front brakes. There’s different rear calipers on the the 800 depending on 2WD or 4WD and I’m not sure if the parking brake is the same where the 800 rear rotor would just drop on so I wouldn’t want to blindly order parts. The bracket bolt spacing could be different, too.

All that I've read says due to bigger rotors, 800 rears were better than 900.

Also -- different size rotors for 800 based on brake options. JL4 has larger (304mm vs 330mm)

 

[fasteddy]

Really curious if the caliper will clear this wheel on my Tahoe -- it's from an '18 Silverado. Noticed it has 28mm offset...or at least that's the number on the backside.View attachment 277208

The guy in the video from the first page got his 2018 18" silverado wheels to fit with a 1/4 inch spacer.
Its was this wheel....2018 Z71?

 

[1BADI5]

I'm looking at the rear dual piston caliper mod next.

Calipers from the 2006 Suburban are dual piston with 330mm/12.99" vented rotors.

I might run up to Autozone this weekend and get some parts to test fit......if they don't work, I'll return them.

 

[fasteddy]

I'm looking at the rear dual piston caliper mod next.

Calipers from the 2006 Suburban are dual piston with 330mm/12.99" vented rotors.

I might run up to Autozone this weekend and get some parts to test fit......if they don't work, I'll return them.

Do you know what the increase in pad area is over my 2003 tahoe? Its 4x4 so it has 2P calipers as well.

 

[mang213]

I seem to remember people swapping to the GMT-800 two piston rear calipers as an upgrade for the 900s.

I did this a year ago [emoji106] works fine, nothing major

Sent from my SM-G960U using Tapatalk

 

[mang213]

I just got the passenger side caliper and my Stoptech ss lines yesterday. Doubt I'll have everything by this weekend but I should be able to mock up what I have and see if my 2010 Z71 18's will clear. Pics to come

Sent from my SM-G960U using Tapatalk

 

[the_tool_man]

Dan , PLUS these vehicles could use a bit more bias on the rear brakes. I could never get used to the nose dive these vehicles take due to the lack of rear brake bias.

I'm curious. How does brake bias affect brake dive? I always thought brake dive was just a function of weight transfer vs. suspension stiffness.

 

[FrankU]

I'm curious. How does brake bias affect brake dive? I always thought brake dive was just a function of weight transfer vs. suspension stiffness.

Bias means that it favors , in this case the front brakes. It feels like the front bias knocks the Tahoe off balance. Whereas I prefer more rear bias to help control the vehicle better. The rear disc brakes on these vehicles is a joke , to me anyways.

The 2006 SSV I had had very good brakes. It had bigger brakes all around and had hydro-boost assist.

 

[treehan77]

You don’t have hydroboost? I’d be upgrading to that before these big brakes…