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Author Topic:   Power brakes or no?
dode
Dirt Freak

Total posts: 417
posted October 02, 2002 12:03 PM UIN: 13209501
We are running a metric with rear disks on a 1/2 mile track that is pretty fast. Are power brakes a viable option, or should we stick with manual brakes. I know we had manual brakes last year, and I wasn't fond of them (came with the car) and I had to brace the heck out of the firewall to keep it from flexing. What's everyone's opinion on this, and what should I get the brakes from?

John

racer17j
Dirt Forum Champ
Total posts: 1565
posted October 02, 2002 01:04 PM UIN: 54865418
i'm not real fond of manual brakes but you also have to look at the fact that if you have a realy radical cam it might not pull the vacume needed to run a booster. but like everything else it's alot to do with making the driver feal comfortable and confident with his ride. if you want to go power just get one off another metric car thats what i do if manual is what you deside 68-73 chevy trucks will bolt right up

[This message has been edited by racer17j (edited October 02, 2002).]

dode
Dirt Freak

Total posts: 417
posted October 02, 2002 01:05 PM UIN: 13209501
How much vacuum is needed? We don't run real wild cams really...plus I could always run a canister if needed...

John

racer17j
Dirt Forum Champ
Total posts: 1565
posted October 02, 2002 01:08 PM UIN: 54865418
not exactly sure how much it takes we have run cams up to 512 lift and been alright

dode
Dirt Freak

Total posts: 417
posted October 02, 2002 01:10 PM UIN: 13209501
What is your setup off of? I am guessing it has more to do with duration and timing than lift.

John

Geffy95x
Dirt Maniac

Total posts: 122
posted October 02, 2002 01:16 PM
Manual brakes have allways given me better feel ,just my two cents worth.

racer17j
Dirt Forum Champ
Total posts: 1565
posted October 02, 2002 06:26 PM UIN: 54865418
mine just come off a metric car anyone with a booster if i rember right you had that hydrolic booster set up right thats what i had on my first car and i took it all and put this one i have now on it. right now i'm running a 480 lift and 284 dur with 1.5 rockers but i run 1.6 so i'm not sure what all that changes but anyway i run it at 34* timing

carscomefirst
Dirt Full Roller

Total posts: 45
posted October 02, 2002 07:05 PM
I run a 75 nova with power brakes, I have never had any problems with the feel of them. I run a 406 with mwms#sp cam. .536int lift, .555 ex lift, 106 lobe centers, 255 int dur, 265 ex dur. Run what ever you are comfy with.

rico 08
Dirt Freak

Total posts: 372
posted October 04, 2002 03:42 PM
i guarantee you at the end of the straight at 6000+ if you back out of the throttle you will have vacuum with almost any cam.that's wheen you need the brakes the most anyway.

hughes
Dirt Maniac

Total posts: 141
posted October 10, 2002 07:46 AM
You'll be alright under racing conditions, but run your booster airline off of the intake runner instead of off the carb. The intake will give you a better flow/ vaccum than the Carb. I don't know why but it does work better.

[This message has been edited by hughes (edited October 10, 2002).]

dilbert
Dirt Roller

Total posts: 21
posted October 10, 2002 08:38 PM
I just recently took the booster off mine and went manual--Here's my thoughts for whatever the #$%^& they are worth.
1. Once I got used to the brakes requiring more pressure, I liked them better--they aren't so touchy and I can control amount of breaking better.
2. Tapping the intake runner instead of carb (like hughes said) is the way to go if you run a booster.
3. Without the booster, I have one less possible vacuum leak.
4. If the firewall is flexing--beef it up!

[This message has been edited by dilbert (edited October 10, 2002).]

hughes
Dirt Maniac

Total posts: 141
posted October 11, 2002 02:59 PM
Firewall flex? SHAQUILL O'NEAL counldn't reach the firewall in my car.

Eljojo
Dirt Freak

Total posts: 273
posted October 11, 2002 07:36 PM
Another dumb question...is there any difference in the actual master cylinder itself between the power assisted and the manual? I've always ran one (manual) off an old pick up truck, but the one which came on this Camaro looks like it was replaced recently. If I can take it off the booster and just mount that baby straight on to the firewall, I'll be saving some of those hard to find $$$$$! And one more thought. How about the proportioning valve? Is there any difference between the boosted and the manual?

hughes
Dirt Maniac

Total posts: 141
posted October 13, 2002 11:41 AM
master cylinder off a brake booster set-up does not have a rod to move the piston like the manual ones.

redneck bubbas racing
Dirt Freak

Total posts: 213
posted October 13, 2002 02:09 PM
Your power master cyl. will work fine. You will have to destroy the booster to get the rod out but it will come out, just use it. On your brake pedalyou have two mounting holes, the bottom is for power and the top is for manual. Make sure that you use the top one because the brakes will be very hard if you don't.

Eljojo
Dirt Freak

Total posts: 273
posted October 13, 2002 04:59 PM
Thank you redneck bubba!

Geffy95x
Dirt Maniac

Total posts: 122
posted October 14, 2002 11:20 AM
Prop valve will still work the same ,It only lets a certain amount of pressure through regardless of how hard you brake,which sometimes isn't good in a panick situation.

hoosier_baby_3D
Dirt Maniac

Total posts: 118
posted November 06, 2002 11:11 PM
We have always ran manual brakes with no problem. I have friends that run power brakes and they like those. I think it is mainly up to the driver.

------------------
"Blood, Sweat, and Gears"

[This message has been edited by hoosier_baby_3D (edited November 06, 2002).]

dean_7585
Dirt Forum Racer

Total posts: 88
posted December 07, 2002 07:13 PM
Dilbert, What manual master cylinder did you use ???


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