RPM goes up when brake pedal is pressed?

[dartguy71]

Can anyone tell me why when I put my foot on the brake pedal my engine increases in RPM. I don't have a tac but I can hear it. Is this a sign of a problem with my brake booster?

 

[JayD]

Happened to me once, then I realized the side of my foot was hitting the gas pedal.

 

[SGBARRACUDA]

Can anyone tell me why when I put my foot on the brake pedal my engine increases in RPM. I don't have a tac but I can hear it. Is this a sign of a problem with my brake booster?

Does your car have power brakes? if so your booster diaphragm is leaking a little bit and allowing vacuum to in crease when you step on the brake.

 

[dartguy71]

thanks alot, I was kind of thinking something along those lines. you confirmed it. thanks again

 

[waggin]

on top of the vacume leak that may be present,seems the car might be running a bit rich,contributing to the leaky brake booster problem jmo

 

[dartguy71]

Thanks I will look into it. I just installed a new 4bl carb and intake and did not know it would effect the brake system.

 

[Mark Nixon]

Better replace/repair the booster, any vacuum leaks can lead to a lean running condition, which causes burned valves.

Mark.