C4 Brake upgrade
Thread Starter
Burning Brakes
Joined: Jan 2005
Posts: 1,217
Likes: 0
From: Augusta GA
The more info I get the more I am leaning twards a C5 upgrade and moveing the front to the back. One of the links I posted has the kit on there. The steel braided lines I am going to try and do at the same time. I will research on bleading and replacing the fluid and I am sure that will make a big differance. Thanks again ScaryFast! FYI Dont tell my wife but when we refinance our home to get $ to pay off 80% of our bills I am going to sneak in and take about 1G and do the upgrade...LOL. Really though, I will have to sly talk my way for her to let me do it.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Here's your shopping list then:
plus:
2 custom 84-87 upgrade brackets (don't know source for these)
AC Delco durastop drilled/slotted rear rotors #89000483/89000484 ~$70 each
Rear pads
Earl's SS brake lines #28A080 $90 at summitracing.com
DRM performance bias spring, $12
Compare www.rockauto.com, gmpartsdirect.com, or Superior Chevy of Kansas City (w/ forum discount) for all the GM/ ac delco parts
Remove your stock rear calipers and wire brush and paint to match the front C5s. Don't move your front brakes to the back, that's a lot of work for negative gains.
I'm guessing all this will cost you about $800.
C5 BRAKE UPGRADE
PART P/N UNITS PRICE/UNIT TOTAL
Ceramic Front Brake Pads & Hardware Kit 88909667 1 49.88 49.88
13" C5 Rotor Left (cross drilled & slotted) 88926732 1 40.36 40.36
13" C5 Rotor Right (cross drilled & slotted) 88926731 1 40.36 40.36
Left Front Z06 Caliper 88895128 1 87.03 87.03
Right Front Z06 Caliper 88895129 1 87.03 87.03
C5 Caliper Abutment (RH & LH) 12455799 2 28.23 56.46
C5 Caliper Abutment Boot (2 required per caliper) 12530703 4 2.94 11.76
C5 Caliper Abutment Pins (2 required per caliper) 12530697 4 3.52 14.08
C5 Caliper Bolts (2 required per caliper...included with caliper) 14067559 4 0.86 3.44
C5 Caliper Banjo Bolt 22163795 2 2.32 4.64
Abutment to Bracket Bolts M14-2.0x35mm (Fastenal Brand) 39685 4 1.49 5.96
Bracket to Spindle Bolts 1/2"-20x1.25" * 4 1.15 4.60
PART P/N UNITS PRICE/UNIT TOTAL
Ceramic Front Brake Pads & Hardware Kit 88909667 1 49.88 49.88
13" C5 Rotor Left (cross drilled & slotted) 88926732 1 40.36 40.36
13" C5 Rotor Right (cross drilled & slotted) 88926731 1 40.36 40.36
Left Front Z06 Caliper 88895128 1 87.03 87.03
Right Front Z06 Caliper 88895129 1 87.03 87.03
C5 Caliper Abutment (RH & LH) 12455799 2 28.23 56.46
C5 Caliper Abutment Boot (2 required per caliper) 12530703 4 2.94 11.76
C5 Caliper Abutment Pins (2 required per caliper) 12530697 4 3.52 14.08
C5 Caliper Bolts (2 required per caliper...included with caliper) 14067559 4 0.86 3.44
C5 Caliper Banjo Bolt 22163795 2 2.32 4.64
Abutment to Bracket Bolts M14-2.0x35mm (Fastenal Brand) 39685 4 1.49 5.96
Bracket to Spindle Bolts 1/2"-20x1.25" * 4 1.15 4.60
2 custom 84-87 upgrade brackets (don't know source for these)
AC Delco durastop drilled/slotted rear rotors #89000483/89000484 ~$70 each
Rear pads
Earl's SS brake lines #28A080 $90 at summitracing.com
DRM performance bias spring, $12
Compare www.rockauto.com, gmpartsdirect.com, or Superior Chevy of Kansas City (w/ forum discount) for all the GM/ ac delco parts
Remove your stock rear calipers and wire brush and paint to match the front C5s. Don't move your front brakes to the back, that's a lot of work for negative gains.
I'm guessing all this will cost you about $800.
Last edited by CentralCoaster; May 4, 2006 at 06:13 PM.
Burning Brakes
Joined: Jun 2002
Posts: 1,001
Likes: 1
From: sd
I haven't read the whole thread but in case nobody has posted this info here it is. This is the brake template for your 85 to put the C5 brakes on the front. I had 2 sets of these made at work and have them at home but any machine shop should be able to whip these out in no time. 2nd post down from Joby.
http://forums.corvetteforum.com/show...brake+template
http://forums.corvetteforum.com/show...brake+template
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
Originally Posted by goldeneye_vet
I haven't read the whole thread but in case nobody has posted this info here it is. This is the brake template for your 85 to put the C5 brakes on the front. I had 2 sets of these made at work and have them at home but any machine shop should be able to whip these out in no time. 2nd post down from Joby.
http://forums.corvetteforum.com/show...brake+template
http://forums.corvetteforum.com/show...brake+template
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
goldeneye, The closer together holes should be threaded to fit your stock caliper bracket bolts (M14 course thread I believe).
Did you machine yours out of steel or aluminum?
Did you machine yours out of steel or aluminum?
Burning Brakes
Joined: Jun 2002
Posts: 1,001
Likes: 1
From: sd
Thanks for pointing out the part about machining the holes for threads. I'll have to bring them back in to have that done. Mine were machined from steel. I work with over 30 machinists at the plant and homers are a part of life around here. They did a great job. I mentioned to them they could make some money if they started making these on the side but like anything I don't like to work on computers anymore than the work I do here or my side business in town so I can kind of see the reluctance not to do it. I haven't made up my mind on doing this upgrade just yet. Maybe in the fall/winter when I'm bored as the new engine and paint is a little more than the budget allows for this years mods.
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Race Director
Joined: Feb 2001
Posts: 13,911
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Last edited by Bluewasp; May 5, 2006 at 07:24 AM.
Race Director
Joined: Feb 2001
Posts: 13,911
Likes: 101
From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by red_johnny
Those are really nice but more than what I need. I think 6 pistons are great if you need them but I dont need that many. Thanks bluewasp for the link though!
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
Originally Posted by FELNGR8
If the rears lock up going into a corner, you crash.
If the rears lock up going into a corner, you crash.
If the rears lock up going into a corner, you crash.
Ever watch a NASCrash race at Martinsville or Bristol? Ever watch the Rolex 24? Too much rear bias = wreck!
There's a reason the manufacturers put smaller rotor one pot brakes on the rear. It's so the cars don't crash.
If the rears lock up going into a corner, you crash.
If the rears lock up going into a corner, you crash.
Ever watch a NASCrash race at Martinsville or Bristol? Ever watch the Rolex 24? Too much rear bias = wreck!
There's a reason the manufacturers put smaller rotor one pot brakes on the rear. It's so the cars don't crash.
unless you can do the extensive testing (and crashing) reqd to qualify your increased rear brake bias, DON'T do it..leave your rears ''under braked'' like all manufactures do.
look up the early '80's problem gm had with X-body (citations,etc) cars killing people due to rear brake lock-up, and that was with rear drums
Race Director
Joined: Feb 2001
Posts: 13,911
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by ScaryFast
Wasp, do you still have your old Brembo set up for sale?
Race Director
Joined: Feb 2001
Posts: 13,911
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by CentralCoaster
Also, I think the Wilwoods are overpriced. Those movits look like a more rigid caliper with more swept area. Are they less than WW?
The prices posted on his usa site are the US "retail" I can get you all a few hundred off those prices if anyone is interested.
If you live overseas the posted price for a 6 piston setup is around 5000euros because of the taxes!! ouch
Last edited by Bluewasp; May 5, 2006 at 10:55 AM.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by redrose
unless you can do the extensive testing (and crashing) reqd to qualify your increased rear brake bias, DON'T do it..leave your rears ''under braked'' like all manufactures do.
The DRM spring is already tested in the SCCA showroom stock series. And if you think the manufacturer knows best, why did they underbias the rears by 50%? The first rear disc camaros are even worse. I believe GM didn't even change the bias after losing the drum brakes.
Thread Starter
Burning Brakes
Joined: Jan 2005
Posts: 1,217
Likes: 0
From: Augusta GA
I think I am going to stick with the C5 or Z-06 Upgrade for now....maybe something else latter down the road. Is there a differance between the C5 and Z-06 brakes? I heard there was but I am not too sure.
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Originally Posted by CentralCoaster
The DRM spring is already tested in the SCCA showroom stock series. And if you think the manufacturer knows best, why did they underbias the rears by 50%? The first rear disc camaros are even worse. I believe GM didn't even change the bias after losing the drum brakes.