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-   -   Power Brakes and Vacuum (https://classracer.com/classforum/showthread.php?t=80392)

Dan Fahey 09-20-2021 01:37 PM
Power Brakes and Vacuum
 
Noticed that changing to the Stocker Cam from Pure Stocker.
Ran into two issues

Cannot hold the Converter as much on Launch.
Use to hold as much as 3200rpm.
Now barely launch above 2500rpm

The Line Lock will not hold the car during Burn Out.
Have to power brake to get the tires spinning.

Shut down after a run is no problem.

Is there a good solution to get more Vacuum Boost for the Power Brakes?

Terry Witzel 09-20-2021 04:46 PM
Re: Power Brakes and Vacuum
 
Quote:
Originally Posted by Dan Fahey (Post 648284)
Noticed that changing to the Stocker Cam from Pure Stocker.
Ran into two issues

Cannot hold the Converter as much on Launch.
Use to hold as much as 3200rpm.
Now barely launch above 2500rpm

The Line Lock will not hold the car during Burn Out.
Have to power brake to get the tires spinning.

Shut down after a run is no problem.



Is there a good solution to get more Vacuum Boost for the Power Brakes?

Dan, years ago I used to run one of these, the price has really gone up.

https://www.summitracing.com/parts/c...+5ba2536e62314

Jim Whitehead 09-20-2021 05:12 PM
Re: Power Brakes and Vacuum
 
Electric vacuum booster.

Bob F 09-20-2021 06:24 PM
Re: Power Brakes and Vacuum
 
I’ve built vac canisters using 4” pvc tubing as reservoirs and they worked well on the street.

Tex013 09-20-2021 06:43 PM
Re: Power Brakes and Vacuum
 
a vacuum pump is needed .
You can use the one out of a G8 Pontiac / Aust Holden
This : https://www.hella.co.nz/en/products/...pump-up28.html
or this : https://www.amazon.com/ACDelco-20804...ic+vacuum+pump
You can run full time , race only or switched
Like this : https://www.amazon.com/Superior-Univ...HSQKDHY2J27ZZ3

Tex

ss3011 09-20-2021 11:10 PM
Re: Power Brakes and Vacuum
 
Remove the booster and switch to a manual master cylinder and save all the weight .

garyc 09-21-2021 10:22 AM
Re: Power Brakes and Vacuum
 
jegs has a electric pump for brake boosters

SSDiv6 09-21-2021 10:22 PM
Re: Power Brakes and Vacuum
 
Quote:
Originally Posted by ss3011 (Post 648348)
Remove the booster and switch to a manual master cylinder and save all the weight .
Like SS3011 said, get rid of the booster and install the 9C1 police car brake master cylinder with the 1-1/4" bore size.

RockAuto has brand new master cylinders with the reservoir, Wagner P/N MC131285 on sale for $34.00.

Also, search for a 1993 to 1996, 9C1 police car brake pedal assembly with the pushrod. They have a different brake pedal pushrod lever point.

Dan Fahey 09-22-2021 04:51 PM
Re: Power Brakes and Vacuum
 
Quote:
Originally Posted by SSDiv6 (Post 648422)
Like SS3011 said, get rid of the booster and install the 9C1 police car brake master cylinder with the 1-1/4" bore size.

RockAuto has brand new master cylinders with the reservoir, Wagner P/N MC131285 on sale for $34.00.

Also, search for a 1993 to 1996, 9C1 police car brake pedal assembly with the pushrod. They have a different brake pedal pushrod lever point.
Does that work well with Disk Brakes?

Got this one in today
GM Genuine Parts 20804130 Power Brake Booster Auxiliary Pump Assembly
Have to figure how to mount it and get a Male Connector.

Dan

Tex013 09-22-2021 06:15 PM
Re: Power Brakes and Vacuum
 
here is another pressure switch
https://www.amazon.com/dp/B078T5NL4S/ref

This is similar/same as what they use in the COMP and similar vacuum pumps If you want switched pump operation .

Tex


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