coverting to front dics--power or manual? - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

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post #1 of 15 (permalink) Old Dec 26th, 17, 12:38 PM Thread Starter
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coverting to front dics--power or manual?

Planning a conversion in the spring to front disc brakes...

My motor only makes 9" of Vac at idle, and has tall, slant edge valve covers (full roller rocker setup)...

Is 9" enough vac to run power brakes?

If so, will a "stock" booster work, or will I have to go with a 8 or 9" booster.

Would prefer to go power, but if it'll be a hassle, I'm good with staying manual--the discs will still make a world of difference.

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #2 of 15 (permalink) Old Dec 26th, 17, 12:52 PM
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Re: coverting to front dics--power or manual?

I have 7" vacuum. I have roller rockers/lifters in a 396BB. I added a vacuum pump with a canister and seems to work fine, although I have had other issues that have prevented me from driving it. I think it was a bad Master Cylinder. I installed an 8" booster. that with the surprisingly quiet vacuum pump give me power brakes without engine vacuum.

Brett.......
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post #3 of 15 (permalink) Old Dec 26th, 17, 12:58 PM Thread Starter
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Re: coverting to front dics--power or manual?

Yeah...I'd just a soon leave it manual disc, rather than add the cost of a vacuum pump...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #4 of 15 (permalink) Old Dec 26th, 17, 06:10 PM
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Chris
 
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Re: coverting to front dics--power or manual?

My engine idles with 9" Hg and my power brakes work fine (OEM Delco booster).
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post #5 of 15 (permalink) Old Dec 27th, 17, 06:28 AM
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Re: coverting to front dics--power or manual?

I'm making about 14" of vacuum with my 454. Was worried about it bc of the CompCam, but it worked out ok. Went from manual drums to power front discs. Used a TuffStuff dual-diaphragm booster to clear my tall valve covers which like yours... have slanted outside contour. Wilwood calipers/master cylinder/proportioning valve, CPP rotors... big improvement in braking. Bc I was running 15" rally wheels I didn't go monster on the rotor/caliper setup. I now run 17" but still have my chrome rally's so I can swap back and forth. If I was autocrossing I would've gone big brakes all the way.





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'69 LeMans Blue Coupe, White Interior, 030" over 454, Super T10 4-Speed, Holley 4150, Pertronix Ignition
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Last edited by 57vette; Dec 28th, 17 at 05:56 AM.
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post #6 of 15 (permalink) Old Dec 27th, 17, 07:39 AM
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kevin
 
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Re: coverting to front dics--power or manual?

383 SB with intake valve lift of .530, exhaust .515
I had to add a vacuum canister to get better quality brakes using the stock 11" booster
I have 4" valve covers no problem there
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post #7 of 15 (permalink) Old Dec 27th, 17, 08:13 AM
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Re: coverting to front dics--power or manual?

I have manual front disc. Works great. I didn’t want to risk it with 9” of vacuum.
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post #8 of 15 (permalink) Old Dec 27th, 17, 08:23 AM
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Re: coverting to front dics--power or manual?

My engine is about 11~12in @ 900rpm 241/247 @.050" 545/565 lift, 110 lobe center
13" discs in front, 11" back

7/8" bore willwood master cylinder, no power assist,it's worked fine for me so far.
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post #9 of 15 (permalink) Old Dec 27th, 17, 12:27 PM Thread Starter
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Re: coverting to front dics--power or manual?

Thanks for all of the input...might just stay with manual when I do my conversion...

Or, I might upgrade to power, and if I have issues, just remove the booster...

Will also see what the guys at right stuff have to say about it in the Spring as well (they re always at the carlisle shows)...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #10 of 15 (permalink) Old Dec 27th, 17, 05:38 PM
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Re: coverting to front dics--power or manual?

I too have manual front discs .If you get the correct bore MC there is no problem and I have had no problems with mine. I haven't tried panic stop testing yet.
I also converted the rear drums to 11x2. This aids in stopping quite a bit.
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post #11 of 15 (permalink) Old Dec 27th, 17, 06:14 PM
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Re: coverting to front dics--power or manual?

I was thinking of converting my power front disc to manual. I was reading some brake building tech articles and apparently with all the correct components and some pedal geometry mods you can have just as good if not better braking power.

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post #12 of 15 (permalink) Old Dec 28th, 17, 10:11 AM Thread Starter
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Re: coverting to front dics--power or manual?

OK...likely going manual front disc conversion...

What is the "best" kit out there (value-wise)...just looking for standard swap--don't need wilwood, big brakes, etc...just a simple disc swap...

I see kits form right stuff (also could pick up for a likely discount in the spring at Carlisle), CPP, SSBC, and of course all of the resto huses have kits...

any to really avoid?

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #13 of 15 (permalink) Old Dec 29th, 17, 05:21 AM
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Kip
 
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Re: coverting to front dics--power or manual?

IF ... you end up going with power brakes... do yourself a favor and get a 9" dual diaphragm booster...

1967 SSRS
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post #14 of 15 (permalink) Old Dec 29th, 17, 11:02 AM
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Joe
 
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Re: coverting to front dics--power or manual?

I'm running manual front discs. IMHO, the camaro is so light, you really don't need power boost. Simply upgrading to front discs is a drastic improvement.

I installed the AFX 14" wheel kit from the right stuff. Easy install and worked great. Uses the stock drum brake spindles. I saved more money by calling them and ordering just the rotors and brackets, and sourced everything else myself.

The right stuff AFXWK14 kit utilizes 88-91 Celebrity calipers/pads/hoses, which I got at my local auto or orielly's. Autozone also had a disc/drum master cylinder for '68 Camaro. I used a proportioning valve from a '79 camaro in the salvage yard, and bent my own brake lines. Peicing it together this way took a little more legwork, but cost less than ordering the full right stuff AFXWK14 kit.
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The important thing here is that you ask me what kind of car I've got. "I've got a BITCHIN' CAMARO"
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post #15 of 15 (permalink) Old Dec 29th, 17, 11:58 AM
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Suprised no one has mentioned hydro boost. I have done standard disk with and without a booster. Not much difference in just a mild built big block car. I run hydro boost on my big block step side. It doesn't really matter, just don't cut corners. I have never had a issue with the gm factory disk set up. The high dollor stuff has its place, but for the street , I think it is over kill. Just my thoughts not trying to hurt big brake feelings.?
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