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#1 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Got My Rear Discs On
Ive been wanting to do this for a while and finally just got it done. Bought a kit from Blackbirds and found it to work really well. Randy was a great help and doesn't forget you when your check cashes.
![]() ![]() ![]() ![]() ![]() I'm using the stock prop valve and master cylinder. I had to adjust the parking brake and play with the cables a little to make it work. I also had to make a bracket for the parking brake to replace the backing plate that held it stable. I am very pleased with how the whole system works without any other changes. I'm going to drive it for a while and try to find a nice wet slick skid pad to test out how stable it stops in the wet. |
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#2 |
Its Topless Season!!!!
Join Date: Jul 2007
Location: fort worth, tx
Posts: 1,657
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Re: Got My Rear Discs On
That is awsome..If you don't mine me asking how much was the kit..what was all included and do you think I can put this on a 4x4 Blazer?
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#3 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Got My Rear Discs On
Thanks! The kit was $585. It includes the calipers, rotors, brackets, mounting hardware and new short flexible brake line. Check with Randy about your application, he really is very helpful. blackbirdscustomtrucks.com
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#4 |
Registered User
Join Date: Mar 2006
Location: AZ
Posts: 372
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Re: Got My Rear Discs On
I love the way rear disks look.
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#5 |
Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: Got My Rear Discs On
is that $585 shipped ?
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1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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#6 |
Registered User
Join Date: Jul 2008
Location: TX
Posts: 737
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Re: Got My Rear Discs On
Nice Work, Looks Great!
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------------------------------------------------- Jim Garage fillers... 85 Chevy C10 Silverado LWB 07 Nissan Altima 2006 Mini Cooper S |
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#7 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Got My Rear Discs On
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#8 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Got My Rear Discs On
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#9 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Got My Rear Discs On
Just curious,
You said you were using the stock prop and master cylinder, your not using the one that was with the old drum brakes are you? Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#10 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Got My Rear Discs On
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#11 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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71meangreenc10, Are you thinking I should have changed the MC and prop. valve? I have read that you should do this if the rear brakes are heating up. My truck stops great and the brakes run cool. The rear discs are not any hotter than the front. I've had it in traffic and on the interstate for a 30 mile run at around 75-80 mph, pulled over and felt the brakes and they were great. The old disc/drum prop valve and mc setup seems to be working great but I'm not against more changes if they are needed to be safe. Any input from you and other folks will be appreciated. Thanks, Gator
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#12 |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Got My Rear Discs On
i am actually suprised that you arent having any braking issues with the rear, and yes you should have switched over to a disc/disc MC and prop valve. if it were my truck i probably wouldnt be driving it. disc brakes require less psi and more volume to operate due to their design differences over drum. so right now, you are sending way too much psi and not enough volume to the rear. the volume may not be an issue now, but when your rear pads get thin you may be running out of fluid in the resivoir to push the pads to the rotor, which would mean substantially less braking power to the rear. I would absolutely call randy and ask his opinion since it is his product. spend the extra money and do it right. after all, crappy brakes=wrecked truck or hurt people
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#13 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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Re: Got My Rear Discs On
Well I did ask Randy what he thought and he said most times your stock set up will work fine. He said to try it out and if it was a problem to call him. I thought I would ask the board for advice. It works great now but if it needs to change then I'll do it. Its kinda like if it aint broke don't fix it. I would not drive the truck if it didn't feel safe but it stops better than it ever has .
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#14 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Got My Rear Discs On
Im suprised more people havent jumped on this but,,,,Chris is right that the systems use different pressures, props are designed differently for disk/disk, disk/drum applications.I have talked to MP Brakes, CPP and googled alot. I would really get alot of opinions before I would leave that setup on my truck. Just peace of mind. Now there are different bores on the master cylinders that will affect your braking, I had a large bore and now I am getting a smaller one for my truck. Large bore did not do the job. I am also putting glocks kit on my short bed, the cadillac calipers in my opinion are garbage and I hate them. The camaro calipers look alot better. (my opinion).
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#15 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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I FEEL THE LOVE MAN!!!! o.k. My calipers suck and the truck is dangerous to drive. Now what master cylinder and prop valve are you guys using to make this combo safe? I'd like to have some real world experience from you guys before I buy more stuff.
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#16 |
Registered User
![]() Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,522
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Re: Got My Rear Discs On
The deal with the residual valve is that in some cases it may cause the pads to drag more than desired on the rotors.
. I've checked with a couple of different vendors and they gave the same response that Gater 2511 got. |
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#17 |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Got My Rear Discs On
I believe mr48chev is refering to the residual valve that is built into the mc for a disc/drum MC, see drum brakes have that residual valave to keep a few psi in the brake fluid to put some pressure on the cups of the seals in the wheel cylinder to help avoid leaks. this few psi is still there on your rear discs, which i would imagine is causing the pads to start to drag on the rotors even with your foot off the brake, such as mr48chev is suggesting. you see there is quite a bit of engineering that is involved in brakes. it is important to understand some of this brake theory before changing things around. thats why so many guys end up having problems. please see one of my earlier posts on volume, things may be peachy now, but when your rear pads get thin you may not have much rear brakes at all (depending on the volume requirements of the rear calipers). i dont like to take chances and go on feel alone, from a brake theory and engineering standpoint your setup is wrong. hope im not sounding like a nagging mother here, just trying to emphasize the importance of properly working brakes.
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'55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife |
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#18 |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Got My Rear Discs On
your truck may not be that "dangerous", as you said it stops better than ever before, and i am sure there are guys out there right now with the same setup driving for years with no "apparent issues" but we are just trying to help you get your truck "spot on" and help to try and minimize any potential issues that may arise
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'55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife |
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#19 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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I am always looking for information to make my truck better. I appreciate your input. Your point about later on is well taken. I'll most likely change the mc and the prop. I'm just hoping to get some of the guys to tell me what they are using so I can have more info. Thanks
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#20 | |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Got My Rear Discs On
Quote:
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'55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife |
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#21 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Got My Rear Discs On
Currently I have a MP brakes master cylinder with a CPP prop valve, and the dreaded Cadillac calipers. I do have a CPP master cylinder in my garage that will go on with the glocks camaro stuff. My MP brakes master cylinder has a bigger bore than the CPP one. So I cant compare anything at the moment until it gets changed. I do aggree that when you go from drums to disks in the rear its 200% different. I like it and how it rides(but currently having issues) and want to do it for my burb, but I have to get a warm and fuzzy on the conversion before I put my kids in it. If not,,,,I will go back to drums on the back.
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#22 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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So You think one should stick with the origional bore size? It does seem that bigger bore would equal more fluid movement and more caliper movement. You are not happy with that though? How does it feel? I have to laugh when you say the Caddy calipers are bad cause I'm already committed.
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#23 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Got My Rear Discs On
Well,
I dont even know where to start with the bore size issue. I am really disgusted with the whole rear disk conversion for my truck and way too deep in with cash on it....I told CPP what i was doing and they sold me the kit,,,without Prop or Master cylinder. Then I researched found out I should change the MC and Prop...Called MP cause they were just down the road from me. Got there MC, got the Prop from CPP.. When I first put it on the brakes were amazing, Stopped on a dime and you would hit the window if not careful. Then it just got weak. No leaks, blead them with all kinds of stuff,,,manual bleeding, pressure bleeding, no luck,,,brakes were crap. I hate the park brake in the caddy calipers too. Then I called CPP again and told them what was going on and they sent me there MC which I havent put on yet due to deployment,,,yada yada yada,,now I am moving across country (AGAIN) so it will have to wait. It would have been nice when I bought the kit that CPP would have said "hey you need x y z" to make this work properly, but they didnt. In my opinion they should have. Cause everytime I called them, they were like yeah you need this. So why didnt they do this from step one,,,I dont know. Back to bore sizes,,,there are a few and I can tell you that I have a large bore, and its not giving me a good braking when applied, like it did the first time I put it all together. But it also could be the calipers too. Mine dont even have 500 miles on them and they are garbage....... HATE HATE HATE the caddy calipers.... If you ever say Office Space....The caddy calipers will get the same fate as the copier/fax..... Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time Last edited by 71meangreenc10; 06-04-2009 at 09:33 PM. |
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#24 |
Registered User
Join Date: Mar 2005
Location: tampa florida
Posts: 776
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I'm sorry to hear that. I have been there before myself on other stuff. Once you get started you have to keep going or lose the whole thing. I have to say that so far the Caddy calipers have worked very well for me. I like the parking brake.I don't know what the diff is. You guys made me think about all this and tonight I ordered a new disc/disc master cylinder and prop valve from CPP. Really though I thought all along I might have to replace them but hoped not.Although the brakes work great right now I just want to be sure they stay that way. Thanks for the help and good luck to you.
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#25 |
Registered User
Join Date: Oct 2007
Location: Sykesville MD
Posts: 357
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Re: Got My Rear Discs On
gator, let us know the results when you get the new mc/prop on, good luck to you
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'55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife |
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