DRM Bias Spring install - ZR-1 Net Registry Forums

Billy Mild · 03-24-2017

I have this sitting in my basement from over a year ago. I would like to install it this weekend and flush my brakes on the Vette before my first track day of the year. I have read a few posts and it sounds like after install(which is a PITA) the master cylinder needs to be bled along with the rest of the braking system.

Steps:
1. Replace spring
2. Bleed master cylinder
3. Flush brake fluid

Does this all sound correct? How hard is it to remove the spring? Any tips would be greatly appreciated.

Tony Davila · 03-24-2017

The spring is very easy to replace, you do not have to remove the MC or anything. Follow the instructions by taking out the cylinder, replace spring, but back in and then bleed system.

Bleeding brakes on the Z is easy, start at passenger front, passenger rear, driver rear then driver front, in that order. The spring change makes a noticeable difference in your stopping difference plus now your back wheels get dirty like the front.

edram454 · 03-25-2017

Great mod for the zr1. One of many,many mods my zr1 had and it worked great. stopped on a dime with all 4 brakes working hard. enjoy.

Billy Mild · 03-26-2017

I just got done bleeding the brakes. I didn't bleed the master cylinder after spring replacement. The pedal is very firm withe car off. I will be interested to see how it does.

Review to come soon.

03-24-2017	#1
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	DRM Bias Spring install I have this sitting in my basement from over a year ago. I would like to install it this weekend and flush my brakes on the Vette before my first track day of the year. I have read a few posts and it sounds like after install(which is a PITA) the master cylinder needs to be bled along with the rest of the braking system. Steps: 1. Replace spring 2. Bleed master cylinder 3. Flush brake fluid Does this all sound correct? How hard is it to remove the spring? Any tips would be greatly appreciated. __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration

03-24-2017	#2
Tony Davila Join Date: Jan 2004 Location: Enterprise, Alabama Posts: 349	Re: DRM Bias Spring install The spring is very easy to replace, you do not have to remove the MC or anything. Follow the instructions by taking out the cylinder, replace spring, but back in and then bleed system. Bleeding brakes on the Z is easy, start at passenger front, passenger rear, driver rear then driver front, in that order. The spring change makes a noticeable difference in your stopping difference plus now your back wheels get dirty like the front. __________________ Tony Davila (Projects) Water Meth: http://www.zr1.net/forum/showthread.php?t=19422 Exhaust cut outs: http://www.zr1.net/forum/showthread.php?t=22689 Auxiliary 12V install: http://www.zr1.net/forum/showthread.php?t=22878 Auxiliary pusher fan install: http://www.zr1.net/forum/showthread.php?t=22859 Oil Catch can Project: http://www.zr1.net/forum/showthread.php?t=20320

03-25-2017	#3
edram454 Join Date: Nov 2013 Location: .. Posts: 693	Re: DRM Bias Spring install Great mod for the zr1. One of many,many mods my zr1 had and it worked great. stopped on a dime with all 4 brakes working hard. enjoy. __________________ EDRAM454 1990 #3028..siamese ported plen/hous/SGC/fidanza/DRM LTHeaders/DRM roll cage/camber rod/drilled slot rotors hawk track pads/grand sport calipers/full corsa exhaust/Hurst/NO cats/custom SGC chip/cbeamplate/315's on all 4/intake water plugged/smog removed..RC injectors/LED lights..SHOULD NOT HAVE PUT ALL THE MONEY IN IT.. SOLD.

03-26-2017	#4
Billy Mild Join Date: Aug 2014 Location: Kansas City, MO Posts: 838	Re: DRM Bias Spring install I just got done bleeding the brakes. I didn't bleed the master cylinder after spring replacement. The pedal is very firm withe car off. I will be interested to see how it does. Review to come soon. __________________ Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration