Street Rod brake pedal too sensitive !! HELP!! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-06-2006, 07:56 PM
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Street Rod brake pedal too sensitive !! HELP!!

Here's the set-up...
-1928 Dodge, magnum 360, 518 tranny
-4 wheel disc
-Billet Wilwood Dynalite 4 piston calipers
-2 psi residual valves on both front and rear lines
-rear line has a wilwood variable valve in line
-dual diaphram booster
-CPP master cylinder
-All parts are new
-booster and master cylinder are mounted below floor boards


The problem I'm having is that now that I finally got the engine running, the pedal has absolutely no feel. I can actually apply the brakes with my baby finger.
The pedal should have at least a bit of resistance, but has none. When the engine is shut off and there's no vacuum, the pedal feels OK. Any input would be appreciated. Dan

www.geocities.com/dantechfab

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Old 11-07-2006, 12:32 AM
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First thing that I would say to do would be to block off the vacuum line to the booster and drive it around to see how it feels like that.

One way to reduce your pedal travel is to use a larger bore master cylinder. What make/model/options master cylinder are you using right now? What booster are you running? What diameter is it?

If you were ok with the travel but just wanted more effort you could look into some lower friction pads. What compound pads are you using right now?

You could also put a more wild cam in it that wouldn't make as much vacuum

I think you would be most happy with a larger master and the pads would just be fine tuning after that.
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Old 11-07-2006, 05:53 AM
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These older lighter weight street rods usually do not require a vacuum booster IMO to stop acceptably. Reducing the pedal ratio may be of some help, as well as changing the master cylinder diameter.

Vince
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Old 11-07-2006, 11:44 AM
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The car is not on the road yet. I'm using a dual diaphram 7" booster. The master cylinder is a Corvette style from CPP. It seems to be the standard for street rod use. If I recall, I think it is a 1 1/8 bore. The pads I'm using are the ones that came with the calipers. Thanks
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