brake problems need some help

[marblemike]

HiThis problem is on a 1965 plymouth fury III its got power brakes worked fine. all that was done was put a elderbrock intake and carberator, headers, complete over haul. engine runs great but i have just a little brake at idle it has just enough to hold it but pedal gets hard. i have put a new brake boostrer and master cylinder.
do i need to put a vacum canister on it and if so what kind do i need. its a 383 automatic.
any help would be greatly appreciated. Thanks mike

 

[commando1]

If nothing else has changed, did you hook up the power brake booster vacuum line to the correct port?

 

[1970cat]

if the timing is off it will throw off your vacuum signal

 

[BillGrissom]

Measure your vacuum at idle. If you put in a high-lift cam, which gives that glug-glug "race motor" sound (and fumes of pollution at idle), you likely won't have enough vacuum. If so, install an electric vac pump - $350 aftermarket or $50 (used, ebay) from a newer VW or Audi diesel.

 

[commando1]

Mike????

 

[1966newport]

or switch to manual brakes

 

[CanCritter]

Measure your vacuum at idle. If you put in a high-lift cam, which gives that glug-glug "race motor" sound (and fumes of pollution at idle), you likely won't have enough vacuum. If so, install an electric vac pump - $350 aftermarket or $50 (used, ebay) from a newer VW or Audi diesel.

x2

 

[70NPORT]

Hit n Run

 

[commando1]

No, Mike has been working on it and he's got it solved.

 

[marblemike]

commando thanks far the info and link to the comp cams vacum canister. i appreciate everyone,s help. Thanks marblemike