Booster Push rod length and adjustment

[70Uglybird]

I just got my car back and the brakes are pretty awful. I was expecting pretty good performance for C5's all around. It has to travel quite a bit to even start stopping the car. Customworks recommened I look at the pushrod and this is what I found.

https://static1.pt-content.com/images/pt/2012/08/IMAG0535-1.jpg


https://static1.pt-content.com/images/pt/2012/08/IMAG0537-1.jpg
https://static1.pt-content.com/images/pt/2012/08/IMAG0536-1.jpg

I'm guessing this is two short? Any websites with pictures on how and how much to adjust? C5 brakes, 1 1/8 wilwood master, the booster I was told was 9 inch dual diaphragm. If I can get this, the exhaust, and the turn signals squared away I can drive this thing!!!

Thanks for any and all help!

Bobby

[Apogee]

You want about .020" to .030" free play between the pushrod and master cylinder piston. As for your MC bore size, we would typically suggest running a 1" bore MC with a dual-9" diaphragm booster given our druthers, just like the C5/C6 Corvettes, although you can certainly get the single-10.75" and dual-8" units to perform admirably as well. FWIW, to my uncalibrated eye, I would say you have a dual-7" booster, not a dual-9". A dual-7" booster provides roughly half the boost that a dual-9" does just for reference. That combined with a 25% oversized master cylinder would certainly explain your evaluation of your braking performance, even without the potential pushrod setup issue.

HTH,
Tobin
KORE3

[70Uglybird]

Is that was the case wouldnt it be a firmer harder to push pedal? I'm about ready to ditch the whole setup and buy a combination unit. Maybe the third booster is the charm. This unit is a nice size in the engine bay though...

[Apogee]

My guess is that your pedal travel issue can be correlated to either your pushrod length/engagement with the MC (but without actual dimensions, this is just a guess) and/or potentially air in the system. Even if you address those potential issues, I think your pedal effort is going to be excessive and achieving lockup may not even be possible depending on the pads you have.

Tobin
KORE3

[70Uglybird]

Thanks tobin. I will take your advice and buy the 9 inch with a 1 inch master. Is the wilwood a good unit or do people have bettee luck with others. I'll also buy the brake depth tool and get it right before installing into the car. I have too much into this setup for it not to stop right!

Thanks.