Cheap Proportioning Valve Upgrade
05-29-2012, 02:01 PM
#102
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Re: Cheap Proportioning Valve Upgrade
I have 4 springs left from my package of 5. If anyone wants one send me a PM. No charge. Just send a self addressed padded enevlope with return postage and I'll mail you one.
05-29-2012, 07:32 PM
#103
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Re: Cheap Proportioning Valve Upgrade
The spring install takes less than 5 minutes and really makes a big differance in rear braking effectiveness. I just changed out the spring yesterday when i completed my drum to disc swap and the improvement is outstanding. I don't think my rear drums were doing anything to stop the car. Now it stops on a dime.
I have 4 springs left from my package of 5. If anyone wants one send me a PM. No charge. Just send a self addressed padded enevlope with return postage and I'll mail you one.
I have 4 springs left from my package of 5. If anyone wants one send me a PM. No charge. Just send a self addressed padded enevlope with return postage and I'll mail you one.
05-29-2012, 08:15 PM
#104
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Re: Cheap Proportioning Valve Upgrade
The spring install takes less than 5 minutes and really makes a big differance in rear braking effectiveness. I just changed out the spring yesterday when i completed my drum to disc swap and the improvement is outstanding. I don't think my rear drums were doing anything to stop the car. Now it stops on a dime.
I have 4 springs left from my package of 5. If anyone wants one send me a PM. No charge. Just send a self addressed padded enevlope with return postage and I'll mail you one.
I have 4 springs left from my package of 5. If anyone wants one send me a PM. No charge. Just send a self addressed padded enevlope with return postage and I'll mail you one.
06-12-2012, 08:29 AM
#106
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Re: Cheap Proportioning Valve Upgrade
Thanks for the pictures,
I'm getting mine from Art once its done I'll explain to my wife how to help me bleed the brakes without bitching.
( basically push the pedal but don't say **** except down -up)
I'm getting mine from Art once its done I'll explain to my wife how to help me bleed the brakes without bitching.
( basically push the pedal but don't say **** except down -up)
Last edited by Cadaver Puncher; 06-27-2012 at 06:44 PM.
07-12-2012, 05:50 PM
#108
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Re: Cheap Proportioning Valve Upgrade
I ordered both spring rates and I am going to do some testing with them. I will post my experiences here after I am done. I think it's about time I put those rear disks to work for once in their miserable lives.
07-12-2012, 10:28 PM
#110
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Re: Cheap Proportioning Valve Upgrade
Just got my pack from Grainger, going to try it out tomorrow.
Anyone had any problems at the drag strip with this upgrade?
Edit, Holy cow, what a difference!
Anyone had any problems at the drag strip with this upgrade?
Edit, Holy cow, what a difference!
Last edited by DeathStarr89; 07-13-2012 at 10:37 PM.
07-14-2012, 10:43 PM
#111
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Re: Cheap Proportioning Valve Upgrade
Alright guys, I got the springs from Grainger this week and tonight I installed the stiffer of the two springs (1NCF2) on my GTA.
Just a heads up to anyone doing this mod, after I installed the stiffer spring, I had to bleed air out of both the rear AND front lines. There was actually more air in the front lines that there was in the rear. At any rate, after bleeding the brakes thoroughly, the pedal feels good and firm.
My main concern when installing the stiff spring was that I would have TO much pressure to my rear brakes, causing them to lock up before the fronts under heavy braking, since most of the weight is shifted over the front tires under fast deceleration. When I did take the car out on the road, I did a few hard, straight stops. I was very pleased to be able to tell that there was a noticeable decrease in braking distances. When pushed to their limits, the rear tires did start to talk back, around the same time that the fronts started to chirp. Ideally, I would like to see the rears start to lose traction a little bit later than they do in the current setup, but after doing a more thorough test of the brakes, (more moderate to very heavy braking, along with moderate to heavy braking during corners) I found that the rears don't want to lock up to abruptly, and even while braking heavily in the middle of a corner, the car seems to handle well. The extra braking force to the rear of the car does make for a slight amount of oversteer during braking, but I actually like it. The car used to push really bad when braking during a corner, not what I wanted at all. Overall I am very impressed with this mod!
I have stock calipers with cross drilled and slotted rotors and ceramic pads, so my brakes aren't anything too extravagant, but feel much better than the stock brakes to begin with. The extra braking force to the rear wheels definitely lets the stock braking system work at its full potential.
Not sure if anyone is curious or not, but I included a picture comparing the three springs side by side.
(from left to right: stock spring, 19lb spring (1NCR5), 22lb spring (1NCF2))
Just a heads up to anyone doing this mod, after I installed the stiffer spring, I had to bleed air out of both the rear AND front lines. There was actually more air in the front lines that there was in the rear. At any rate, after bleeding the brakes thoroughly, the pedal feels good and firm.
My main concern when installing the stiff spring was that I would have TO much pressure to my rear brakes, causing them to lock up before the fronts under heavy braking, since most of the weight is shifted over the front tires under fast deceleration. When I did take the car out on the road, I did a few hard, straight stops. I was very pleased to be able to tell that there was a noticeable decrease in braking distances. When pushed to their limits, the rear tires did start to talk back, around the same time that the fronts started to chirp. Ideally, I would like to see the rears start to lose traction a little bit later than they do in the current setup, but after doing a more thorough test of the brakes, (more moderate to very heavy braking, along with moderate to heavy braking during corners) I found that the rears don't want to lock up to abruptly, and even while braking heavily in the middle of a corner, the car seems to handle well. The extra braking force to the rear of the car does make for a slight amount of oversteer during braking, but I actually like it. The car used to push really bad when braking during a corner, not what I wanted at all. Overall I am very impressed with this mod!
I have stock calipers with cross drilled and slotted rotors and ceramic pads, so my brakes aren't anything too extravagant, but feel much better than the stock brakes to begin with. The extra braking force to the rear wheels definitely lets the stock braking system work at its full potential.
Not sure if anyone is curious or not, but I included a picture comparing the three springs side by side.
(from left to right: stock spring, 19lb spring (1NCR5), 22lb spring (1NCF2))
07-14-2012, 11:22 PM
#113
Re: Cheap Proportioning Valve Upgrade
Alright guys, I got the springs from Grainger this week and tonight I installed the stiffer of the two springs (1NCF2) on my GTA.
Just a heads up to anyone doing this mod, after I installed the stiffer spring, I had to bleed air out of both the rear AND front lines. There was actually more air in the front lines that there was in the rear. At any rate, after bleeding the brakes thoroughly, the pedal feels good and firm.
My main concern when installing the stiff spring was that I would have TO much pressure to my rear brakes, causing them to lock up before the fronts under heavy braking, since most of the weight is shifted over the front tires under fast deceleration. When I did take the car out on the road, I did a few hard, straight stops. I was very pleased to be able to tell that there was a noticeable decrease in braking distances. When pushed to their limits, the rear tires did start to talk back, around the same time that the fronts started to chirp. Ideally, I would like to see the rears start to lose traction a little bit later than they do in the current setup, but after doing a more thorough test of the brakes, (more moderate to very heavy braking, along with moderate to heavy braking during corners) I found that the rears don't want to lock up to abruptly, and even while braking heavily in the middle of a corner, the car seems to handle well. The extra braking force to the rear of the car does make for a slight amount of oversteer during braking, but I actually like it. The car used to push really bad when braking during a corner, not what I wanted at all. Overall I am very impressed with this mod!
I have stock calipers with cross drilled and slotted rotors and ceramic pads, so my brakes aren't anything too extravagant, but feel much better than the stock brakes to begin with. The extra braking force to the rear wheels definitely lets the stock braking system work at its full potential.
Not sure if anyone is curious or not, but I included a picture comparing the three springs side by side.
(from left to right: stock spring, 19lb spring (1NCR5), 22lb spring (1NCF2))
Just a heads up to anyone doing this mod, after I installed the stiffer spring, I had to bleed air out of both the rear AND front lines. There was actually more air in the front lines that there was in the rear. At any rate, after bleeding the brakes thoroughly, the pedal feels good and firm.
My main concern when installing the stiff spring was that I would have TO much pressure to my rear brakes, causing them to lock up before the fronts under heavy braking, since most of the weight is shifted over the front tires under fast deceleration. When I did take the car out on the road, I did a few hard, straight stops. I was very pleased to be able to tell that there was a noticeable decrease in braking distances. When pushed to their limits, the rear tires did start to talk back, around the same time that the fronts started to chirp. Ideally, I would like to see the rears start to lose traction a little bit later than they do in the current setup, but after doing a more thorough test of the brakes, (more moderate to very heavy braking, along with moderate to heavy braking during corners) I found that the rears don't want to lock up to abruptly, and even while braking heavily in the middle of a corner, the car seems to handle well. The extra braking force to the rear of the car does make for a slight amount of oversteer during braking, but I actually like it. The car used to push really bad when braking during a corner, not what I wanted at all. Overall I am very impressed with this mod!
I have stock calipers with cross drilled and slotted rotors and ceramic pads, so my brakes aren't anything too extravagant, but feel much better than the stock brakes to begin with. The extra braking force to the rear wheels definitely lets the stock braking system work at its full potential.
Not sure if anyone is curious or not, but I included a picture comparing the three springs side by side.
(from left to right: stock spring, 19lb spring (1NCR5), 22lb spring (1NCF2))
07-17-2012, 07:05 AM
#116
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Re: Cheap Proportioning Valve Upgrade
Just by way of reference for you all, McMaster Carr springs are as follows:
http://www.mcmaster.com/#compression-springs/=ifzr6a
Lg. Spring
OD Wire
Dia. Compressed
Lg. Load,
lbs. Rate,
lbs./inch Pkg.
of 5
1.500" 0.48" 0.063" 0.694" 22.94 37.00 9434K121
$5.11
Lg. Spring
OD Wire
Dia. Compressed
Lg. Load,
lbs. Rate,
lbs./inch Pkg.
of 5
1.500" 0.48" 0.063" 0.694" 19.93 32.15 9435K123
$6.31
http://www.mcmaster.com/#compression-springs/=ifzr6a
Lg. Spring
OD Wire
Dia. Compressed
Lg. Load,
lbs. Rate,
lbs./inch Pkg.
of 5
1.500" 0.48" 0.063" 0.694" 22.94 37.00 9434K121
$5.11
Lg. Spring
OD Wire
Dia. Compressed
Lg. Load,
lbs. Rate,
lbs./inch Pkg.
of 5
1.500" 0.48" 0.063" 0.694" 19.93 32.15 9435K123
$6.31
07-28-2012, 08:17 PM
#118
Re: Cheap Proportioning Valve Upgrade
Im also looking for the higher rate spring. Please PM me with a price if anyone has an extra one. Thank you.
nevermind. I ordered a pack of them from Grainger. I got the 1NCF2 spring so if someone needs one then let me know. They should be here around the 31st.
nevermind. I ordered a pack of them from Grainger. I got the 1NCF2 spring so if someone needs one then let me know. They should be here around the 31st.
Last edited by BOTTLEDZ28; 07-30-2012 at 01:53 PM.
07-30-2012, 05:52 PM
#119
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Re: Cheap Proportioning Valve Upgrade
I picked up the lower rate spring from Mcmaster Carr , 9435K123. If anyone needs one, PM me.
08-01-2012, 12:50 PM
#120
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Re: Cheap Proportioning Valve Upgrade
I got the 1NCF2 spring if anyone need one $5.00 plus shipping
Last edited by 55ChevyMan; 10-29-2012 at 04:13 PM.
08-01-2012, 01:41 PM
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Re: Cheap Proportioning Valve Upgrade
I started changing the spring it came out easy but the new spring does want to go in I will have to remove the AC compressor 94 Corvette Lt1 with the vette AC
08-02-2012, 10:11 PM
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Re: Cheap Proportioning Valve Upgrade
picked up the spings today and intalled it but still need to bleed brakes
08-02-2012, 10:38 PM
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Re: Cheap Proportioning Valve Upgrade
got it in I plan on using a Phoenix Reverse bleeding System when bleeding the brakes
09-16-2012, 09:44 PM
#125
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Re: Cheap Proportioning Valve Upgrade
I GOT 2 LEFT 5 dollars plus shipping
Last edited by 55ChevyMan; 10-29-2012 at 04:13 PM.
09-17-2012, 08:36 PM
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09-17-2012, 10:21 PM
#127
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Re: Cheap Proportioning Valve Upgrade
Will this spring work/help or remove the need to change the PV when swaping from rear drum to LS1? Or would I still need to get a new PV?
09-21-2012, 10:50 PM
#128
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Re: Cheap Proportioning Valve Upgrade
I can confirm that the Grainger 1NCF2 is in fact a direct swap-in replacement for the 82-84 cast iron CV's. There is a noticeable stiffness difference between the stock disk/drum spring and this new one. I'm guessing the old feel's about 15/lb but i have no way to confirm an exact lb number.
09-22-2012, 10:51 AM
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Re: Cheap Proportioning Valve Upgrade
I change mine and it big difference much better an improvement now my rear disc work
09-24-2012, 10:30 PM
#130
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Re: Cheap Proportioning Valve Upgrade
Does anyone have any of these springs left? I would like to buy one.
09-28-2012, 10:12 AM
#134
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Re: Cheap Proportioning Valve Upgrade
do you still want that spring ?
09-28-2012, 01:47 PM
#136
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Re: Cheap Proportioning Valve Upgrade
send me your address I don't shipping would cost more then buck are two
10-01-2012, 02:55 PM
#138
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Re: Cheap Proportioning Valve Upgrade
my pay pal address is brioneschevybelair@yahoo.com to pay for the spring
thankyou
thankyou
10-02-2012, 07:24 AM
#139
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Re: Cheap Proportioning Valve Upgrade
so i happend across this thread today and searched the basement for springs grandpa did lot of pinball machine repair in his day would you believe he had a sorted cabniet of springs by length and strength rating i tested 20,25,28,33,38lb .
all i can say is "thanks grandpa" and here i was about to toss all this stuff
mind you its raining so figured perfect time to test ; 38lb locks the rears every single time you jam on the brakes kicks out bad too so i skipped the 36 and 34 rated; 32 the rears lock almost instantly after the fronts do good but could get hair in a panic stop ; 28 seemed to be the the best as the rears have great stopping power but lock only after the fronts do but not every time very predictible brakeing i couldnt find a 30lb rating in this length
20 no differant then stock prop 25 seemed much better but still couldnt lock the rears even in poring rain but you could feel the rear brakeing effect i may swap back to this
i really shouldnt have stayed up all night doing this got to work now in an hour lol
my brake setup is Corvette c4 12 inch up front and stock 92 fbody pbr rear basicly the 1le setup my front rotors keep getting heat fractures from doing my guess 90 % of the stopping power car im hoping the testing i just did helps somebody
all i can say is "thanks grandpa" and here i was about to toss all this stuff
mind you its raining so figured perfect time to test ; 38lb locks the rears every single time you jam on the brakes kicks out bad too so i skipped the 36 and 34 rated; 32 the rears lock almost instantly after the fronts do good but could get hair in a panic stop ; 28 seemed to be the the best as the rears have great stopping power but lock only after the fronts do but not every time very predictible brakeing i couldnt find a 30lb rating in this length
20 no differant then stock prop 25 seemed much better but still couldnt lock the rears even in poring rain but you could feel the rear brakeing effect i may swap back to this
i really shouldnt have stayed up all night doing this got to work now in an hour lol
my brake setup is Corvette c4 12 inch up front and stock 92 fbody pbr rear basicly the 1le setup my front rotors keep getting heat fractures from doing my guess 90 % of the stopping power car im hoping the testing i just did helps somebody
Last edited by Azrael91966669; 10-02-2012 at 07:33 AM.
10-14-2012, 03:40 PM
#140
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Re: Cheap Proportioning Valve Upgrade
Anyone have a spring for sale ?
10-14-2012, 06:53 PM
#141
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Re: Cheap Proportioning Valve Upgrade
I got some 5 bucks shipped
10-15-2012, 07:29 AM
#142
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Re: Cheap Proportioning Valve Upgrade
Paypal is sent to you 55chevyman, Shoot me a message once you ship it.
Thanks for the help!
jason
Thanks for the help!
jason
10-15-2012, 10:09 AM
#143
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Re: Cheap Proportioning Valve Upgrade
send me a address to send to and my paypal is brioneschevybelair@yahoo.com I See you paid paypal now send me your Address to send you the spring thank you
Last edited by 55ChevyMan; 10-15-2012 at 10:13 AM.
10-15-2012, 10:21 AM
#144
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Re: Cheap Proportioning Valve Upgrade
Just emailed you the info thanks
10-16-2012, 05:46 PM
#145
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Re: Cheap Proportioning Valve Upgrade
just came across this thread today. ran out to buy some springs after reading it. installation was super easy (besides trying to get the cap back on) and straightforward. now all i need is to bleed the brakes and i can enjoy awesome brakes! thanks guys! 
10-23-2012, 02:48 AM
#146
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Re: Cheap Proportioning Valve Upgrade
Does anyone know if theres a diff for drum prop valve?? I swappped to disx reara but the donor car had a crapped out valve so i havnt had a chance to fix it really. Could this be a small help or should i find a 4disc valve and swap the internal spring for maximized brake performance?? I just need this for a tiny bit as a yeae from now ill be doing a big brake upgrade but it wont hurt getting used to beter brake force for when i get big brakes.
10-24-2012, 05:07 PM
#147
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Re: Cheap Proportioning Valve Upgrade
I had a drum proportional valve still in when I did a rear disc brake swap and brakes barely would stop then I put a grainger 1ncr5 spring and now it stops quick. This simple upgrade took like 2 minutes to do and made all the difference in the world.
10-24-2012, 05:13 PM
#148
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Re: Cheap Proportioning Valve Upgrade
Yes there is a difference in the proportional valves in the drum and disc brake cars but the spring gives enough pressure to the rear brakes.
10-26-2012, 11:34 AM
#149
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Re: Cheap Proportioning Valve Upgrade
Does anyone have an extra grainger 1NCF2 22 Lb spring that they'd be willing to sell to me? I'm located in Canada. Pm me and let me know. Thanks.
10-26-2012, 09:19 PM
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Join Date: Mar 2007
Location: Slinger WI
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Car: 55 chevy Belair & 86IROC Z
Engine: 350 in 55 86IROC Z LT1
Transmission: 55 4speed IROC Z4L60e
Axle/Gears: 12 bolt 410 in55 and 342 inCamaro
Re: Cheap Proportioning Valve Upgrade
I have some but if you can get from grainger it cheaper what sucks is shipping