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C4 brake question/experiences

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Old May 27, 2004 | 11:24 AM
  #1  
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Car: 1987 Iroc
Engine: 357 Single plane and a Ysi vortech
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Axle/Gears: 3.50 9"
C4 brake question/experiences

Hey. Altough I have had my C4 brake upgrade from Ed for over 1 year I only have about 2000-3000 miles on them.

First my review........They were easy to install, and after I put them back on my brakes never fade, but here is the problem.

They are hard!!! Hard as in you gotta really push em to get them to stop and this was even as soon as I put them on(ie before they sat and got any kind of build-up or film on them. ) Sometimes it seems the harder you push does not do anything more.

I was wondering what pads, yall are using on your setups to give it a better feel.

Thanks

Chris
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Old May 27, 2004 | 02:47 PM
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From: chico, cali
Car: 92 camaro Rs
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could be a bad booster master cylinder or they might just need a good bleed. check that out but if you are using a harder pad that might have a little to do with it but I dont think it should make your breaks that stiff
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Old May 27, 2004 | 05:26 PM
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Hi Chris. I did notice a firmer pedal but not a hard one, at least not as you described it. Did you swap out the master cylinder for the disc/drum (J55) master? If not, I'd do that. That's what the 1LE cars use and those are the same calipers essentially.

Ed

PS: I still want the rearend, I'm just a bit busy lately...in the hospital having a baby. I hope it's still available.
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Old May 28, 2004 | 01:02 PM
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Car: 1987 Iroc
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Transmission: T56
Axle/Gears: 3.50 9"
1LE uses the disk/drum master?

That is what I have.

Yep the rearend is still in the car!!

Thanks

Chris
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Old May 29, 2004 | 12:40 AM
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Originally posted by ebmiller88
Did you swap out the master cylinder for the disc/drum (J55) master? If not, I'd do that. That's what the 1LE cars use and those are the same calipers essentially.
You mean J65 for the drum mc. J55 is the C4 13" brake option
[edit] Oops, ment to say J50 for drum, not J65.

Last edited by Justins86bird; May 29, 2004 at 03:28 AM.
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Old May 29, 2004 | 01:21 AM
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Car: 86 LG4 & 92 TBI Firebird
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Re: C4 brake question/experiences

Originally posted by NufNuffZ28
I was wondering what pads, yall are using on your setups to give it a better feel.
Because of the different amount of piston area compared to the 1 piston caliper, they give a bit firmer pedal. It shouldn't be too drastic, just noticable. I use Hawk HPS pads. Seem pretty good.
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Old May 29, 2004 | 02:52 AM
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Originally posted by Justins86bird
You mean J65 for the drum mc. J55 is the C4 13" brake option
Actually, it's J50 for the disc/drum/1LE master cylinder. J65 was the disc/disc mc until 1990 when GM decided to use the J50 for all F-body models.

The bigger brakes should grab better. My 1LE brakes made a major improvement in m how my car stops. The pedal feels about the same, maybe a tad firmer, but the car stops with ease. I'm using the EBC Greenstuff pads in front with Hawk pads in the rear.

The big problem I have is that the '88 rear discs can't keep up with the 1LE fronts and I have too much front brake bias.
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Old May 29, 2004 | 03:24 AM
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Car: 86 LG4 & 92 TBI Firebird
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Transmission: 700R4
Axle/Gears: 3.42
Originally posted by BretD 88GTA
Actually, it's J50 for the disc/drum/1LE master cylinder. J65 was the disc/disc mc until 1990 when GM decided to use the J50 for all F-body models.
Doh! You are correct. To many numbers floating around
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Old May 29, 2004 | 07:43 AM
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Axle/Gears: 9 bolt/3.27
I've got Ed's C4 brakes too. Though I haven't logged too many miles on them (less than 2K) I haven't noticed a harder pedal since they were installed back in January,just the firm pedal that it's supposed to have. My car is a 90 and came with disc/drums so I have the J50 MC everyone is referring to.
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Old May 31, 2004 | 08:26 PM
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does ed sell c4 break kits?? what type of pricing is there?

thanks
-Tony
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Old Jun 1, 2004 | 06:59 AM
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Yes he does. Prices start at $550 for a C4 kit but you get $50 back when you send him your old spindles.
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Old Jun 1, 2004 | 08:38 AM
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Originally posted by twolfe
does ed sell c4 break kits?? what type of pricing is there?

thanks
-Tony
Tony, send him a quick email or a pm and I'm sure he'll give you all the info you require. He's very good to deal with.
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Old Jun 1, 2004 | 08:50 AM
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From: Calvert Co. Maryland
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thanks for the info fellas...
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Old Jun 1, 2004 | 08:03 PM
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From: Monroe,NC
Car: 90 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 9 bolt/3.27
Here's a pic of them installed.
Attached Thumbnails C4 brake question/experiences-new-brakes.jpg  
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