DRM Brake Bias Spring.....
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Safety Car
Joined: Dec 2007
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From: Sandhills of North Carolina
DRM Brake Bias Spring.....
Anyone using one of these? If so does it work and if it does is it worth it?
DRM BrakeBias Spring
Good things often come in small packages. A lot of thought and successful racing experience went into the design of the DRM BrakeBias spring. Easily installed, this spring effectively puts more rear brake into your Corvette, giving you shorter stopping distances and more equalized front-to-rear brake pad wear. Also by having the rear pads do more work, front end nose-dive is reduced. This results in greater stability and vehicle control under extreme braking.
1987 - 96 Corvette ABS 10-100 $12.95 1984 - 86 Corvette non-ABS 10-101 $12.95 1997 - 00 Corvette 10-102 $12.95
Safety Car
Joined: Dec 2006
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From: St Marys GA
I've heard good things, and am planning to get one in the near future. Puts more braking force on the rear wheels, which are underused with the factory bias, so you get faster and more stable braking, especially on track.
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From: Almost all Skyline Cruises Vettes at Waterside 1-5
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Yes, yes and yes!
seems to help oversteer
seems to help oversteer
Thread Starter
Safety Car
Joined: Dec 2007
Posts: 3,616
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From: Sandhills of North Carolina
Thanks, funny how these little aftermarket springs can do so much. I put a GM White spring in my oil pump when I did the cam swap. My oil pressure jumped up a lot. I think I'll get one of these and see what happens. 
Race Director
Joined: Apr 2000
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From: Texas
Definitely works. Really helped with front end dive when braking hard on a road course from triple digit speeds.
You won't notice a change when driving on the street except in panic stop situations. Like above, less nose dive and the car will feel a bit more stable.
Here are some pics...
Removal of the old spring
Installing new spring
You won't notice a change when driving on the street except in panic stop situations. Like above, less nose dive and the car will feel a bit more stable.
Here are some pics...
Removal of the old spring
Installing new spring
Le Mans Master
Joined: Aug 2000
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From: Australia
Race Director
Joined: Apr 2000
Posts: 15,344
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From: Texas
Yep, it's the approved tool...at least when I did this 5 years ago If you look really close in the pic, you can see the allen head portion of the socket passes thru the c-clip. In the upper right corner of the pic you can see my c-clip pliers with 90* tangs. Without the pliers, this job would have been a real PIA.
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From: Lacey WA RVN 68-69
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I added the bias spring when I installed my C5 front brake upgrade and it made a tremendous difference. I would say that this is a required part of a C5 brake upgrade on C4's.
Because the C5 front brakes are so much larger compared to the small 11.5" rotors on my 87, I initially got a lot of ABS activation even at medium braking. Even slowing down from 70 onto freeway off-ramps were enough to engage the ABS.
Once the spring was in, the early ABS activation went away and nosedive disappeared. The spring was installed just before a track day and I was really amazed at how level the car stayed when braking from 130 down to 25 for a 90 degree turn.
Because the C5 front brakes are so much larger compared to the small 11.5" rotors on my 87, I initially got a lot of ABS activation even at medium braking. Even slowing down from 70 onto freeway off-ramps were enough to engage the ABS.
Once the spring was in, the early ABS activation went away and nosedive disappeared. The spring was installed just before a track day and I was really amazed at how level the car stayed when braking from 130 down to 25 for a 90 degree turn.
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
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I just put mine in the new master cylinder. I'll report back at the end of Feb after my first track event.
Safety Car
Joined: May 2002
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From: Toronto ontario
It's not a magic spring. if you care about what compound brake pads you use then you might want it. If you care about what kind of tires you use then you might want it. if you upgraded to 13" up front or c5 conversion etc then you definitely want it.
When I first installed the 13" front GS setup I hit the brakes at triple digit speeds and the nose dragged so hard the front spoiler got completely ripped off. After the spring the braking improved dramatically and the car is now flat under deccel.
it wouldnt make it more difficult to heat the tires but I would say it would kill more of your pads faster when doing brake stands.
When I first installed the 13" front GS setup I hit the brakes at triple digit speeds and the nose dragged so hard the front spoiler got completely ripped off. After the spring the braking improved dramatically and the car is now flat under deccel.
it wouldnt make it more difficult to heat the tires but I would say it would kill more of your pads faster when doing brake stands.
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Like GS007 said you wont feel a difference at street speeds but it made a huge improvement at the track. Less nose dive and more control under braking. When I would spend a day at the track only my front wheels would get covered in brake dust and the rear would have a thin hardly noticable coating. Now at the end of the day both front and rear are covered. I had to change to a softer rear track compound pad to help balance the car again.
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Joined: Jun 2009
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Got it a month ago: not noticeable on the street; On the track and hi speed braking, more stable and helps with oversteering. It was a b**tch for me to install, but a very nice mod. For the price is relly worth it, as for the time an work...
Thread Starter
Safety Car
Joined: Dec 2007
Posts: 3,616
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From: Sandhills of North Carolina
Le Mans Master
Joined: Oct 2007
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
I am selling my MC with a bias spring installed already if anyone is interested. Works great, Im just going to something different.
http://forums.corvetteforum.com/c4-p...as-spring.html
http://forums.corvetteforum.com/c4-p...as-spring.html
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St. Jude Donor '12