1991 zr1 bigger brakes with stock sawblades - ZR-1 Net Registry Forums

Johnny5 · 08-26-2022

Anyone install bigger brake calipers for front brakes with stock sawblades? I am looking to upgrade my front brakes + rotors (same size rotor just slotted/drilled) and keep rear brakes stock. I am having issues researching if any kit or C5/C6 brakes would fit our stock sawblade rims. Any input is appreciated. I will be putting braided stainless brake lines and DRM BRAKE Bias spring.

tpr60 · 08-26-2022

I have two stock calipers mounted on each rotor Front and rear. Eight Total Calipers. Copied a kit that was available in the early 90s. Had to make a machine shop run of six mounting brackets. Still have a couple set left if interested ??

Dynomite · 08-30-2022

Quote:

Originally Posted by Johnny5

Anyone install bigger brake calipers for front brakes with stock sawblades? I am looking to upgrade my front brakes + rotors (same size rotor just slotted/drilled) and keep rear brakes stock. I am having issues researching if any kit or C5/C6 brakes would fit our stock sawblade rims. Any input is appreciated. I will be putting braided stainless brake lines and DRM BRAKE Bias spring.

I have the Wilwood 140-8337 Brake Kits installed on a 1990 Standard Corvette with Salad Shooters replacing the 12" Rotors with 13" Wilwood Rotors as shown below......They work perfectly

I also have the same kits installed on a 1990 ZR1 with 1991 Sawblades using 1/8" Spacers (I used Shims to center the Caliper on the Rotor which resulted in moving the Caliper closer to the Sawblade Wheel Spokes).The 13" Rotors were replaced with Wilwood 13" Rotors and the 6 piston Calipers. The Wilwood Brakes 140-8337 work perfectly in this applicaton also.....

Also am using the Wilwood Premium Straight Angle Front Flexline 220-8338 Brake Line Kit on both the 1990 Standard Corvette and the 1990 ZR1 Corvette.

Post 270 - Wilwood 6 Piston Brakes with 13" Rotors and Wheel Alignment

Prez1967 · 08-30-2022

Quote:

Originally Posted by tpr60

I have two stock calipers mounted on each rotor Front and rear. Eight Total Calipers. Copied a kit that was available in the early 90s. Had to make a machine shop run of six mounting brackets. Still have a couple set left if interested ??

Id be curious to see pictures of the setup if they are available!

To the OP: Im running C5 front brakes on my 1994 with stock A-Molds and dont have any issues.

dredgeguy · 08-31-2022

When I was running C5 front brake calipers with A-Molds, no issues but when I changed the A-Molds to the Fikse FM5 I had clearance issues and needed spacers to clear.

Dynomite · 08-31-2022

Quote:

Originally Posted by dredgeguy

When I was running C5 front brake calipers with A-Molds, no issues but when I changed the A-Molds to the Fikse FM5 I had clearance issues and needed spacers to clear.

I have used C5/Z06 Wilwood Brakes on ZR1s with no issues before as long as I use A-Molds. The Wilwood 140-8337 kits were not available then.

I did use 1/8" spacers on the current application of Wilwood 140-8337 using Sawblades on a 1990 ZR1 which the thread of the wheel bolts are still fully engaged with the Lug Nuts. The wheel spokes were not touching the Caliper but within 1/16" without the 1/8" spacers

GOLDCYLON · 09-03-2022

For those doing this mod 6 piston with Wilwood and 17 inch Fiske FM5s they will fit. Spacers were not needed.

Dynomite · 09-03-2022

Quote:

Originally Posted by GOLDCYLON

For those doing this mod 6 piston with Wilwood and 17 inch Fiske FM5s they will fit. Spacers were not needed.

Did you use any shims to center the Rotor within the Calipers (The larger shims)?
Using the larger shims actually moves the caliper closer to the Wheel Spokes.

Did you use any shims to align the Brake Pads on the Wear Surface of the Rotors (The small shims)?

The need for shims varies from wheel to wheel. Wilwood provides 12 large shims (.015") and 16 small shims (.025") with each 140-8337 Brake Kit.

XfireZ51 · 09-03-2022

Dyno,

Are thise shims available separately?

Dynomite · 09-03-2022

Quote:

Originally Posted by XfireZ51

Dyno,

Are thise shims available separately?

I am not sure since Wilwood provides plenty shims with each 140-8337 Brake Kit.

Wilwood provides 12 large diameter shims (.015") and 16 small diameter shims (.025") with each 140-8337 Brake Kit. The large diameter shims are used to move the Caliper side to side to center the Rotor between the brake pads.

The small diameter shims are used to move the Caliper and brake pads radially outward so the brake pads cover the whole surface of the Rotor.

08-26-2022	#1
Johnny5 Join Date: Nov 2014 Location: New Jersey Posts: 363	1991 zr1 bigger brakes with stock sawblades Anyone install bigger brake calipers for front brakes with stock sawblades? I am looking to upgrade my front brakes + rotors (same size rotor just slotted/drilled) and keep rear brakes stock. I am having issues researching if any kit or C5/C6 brakes would fit our stock sawblade rims. Any input is appreciated. I will be putting braided stainless brake lines and DRM BRAKE Bias spring.

08-26-2022	#2
tpr60 Join Date: Feb 2011 Location: Salinas, Ca Posts: 159	Re: 1991 zr1 bigger brakes with stock sawblades I have two stock calipers mounted on each rotor Front and rear. Eight Total Calipers. Copied a kit that was available in the early 90s. Had to make a machine shop run of six mounting brackets. Still have a couple set left if interested ??

08-31-2022	#5
dredgeguy Join Date: Aug 2012 Location: Ellicott City, MD Posts: 1,636	Re: 1991 zr1 bigger brakes with stock sawblades When I was running C5 front brake calipers with A-Molds, no issues but when I changed the A-Molds to the Fikse FM5 I had clearance issues and needed spacers to clear. __________________ Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa

09-03-2022	#7
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,153	Re: 1991 zr1 bigger brakes with stock sawblades For those doing this mod 6 piston with Wilwood and 17 inch Fiske FM5s they will fit. Spacers were not needed. __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

09-03-2022	#9
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,678	Re: 1991 zr1 bigger brakes with stock sawblades Dyno, Are thise shims available separately? __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX