double -pump the brakes

[kawaigng]

some drivers always double -pump the brakes, they give the pedal a quick push and release it before pushing on it for real.this comes from one too many expeiences of pressing on the brake pedal and finding very little pedal there, if your brake fade, this one way to keep safe while you get back to the pits.brake in good working order shouldnt require this, such a tech also requires you to lift your foot from the throttle earlier than otherwise necessary.


is anyone can tell me more details about this tech?

[WRXtreme]

I have always noticed the pedal goes down very far when you press it for the first time. I also pump it once of twice and then you get a very firm pedal that has minimal travel.

[Nose Nuggets]

if you have less pressure under your foot the first time you depress the peddle, then either one of two things is hapaning

a) your racing and your experiencing brake fade

b) you have air in the system, and you need to do a bleed.

you shouldent have to depress the peddle more then once, to have a solid feel.

[WRXtreme]

Its not that it isn't a solid feel or pedal fade, its that the pedal depresses more then it should. If you pump it once then the pedal doesn't travel nearly as far. I've drive multiple WRXs and all felt about the same. Mine did this from the factory.

[Nose Nuggets]

you have air in the system

[kawaigng]

Originally Posted by Nose Nuggets

if you have less pressure under your foot the first time you depress the peddle, then either one of two things is hapaning

a) your racing and your experiencing brake fade

b) you have air in the system, and you need to do a bleed.

you shouldent have to depress the peddle more then once, to have a solid feel.

I understand that if the brake is in a good working order, we shouldnt press more than one time, but if the brake fade do happen while racing, should we double pump it?
I tried that, use my left foot press the brake slightly on the straight line right before I have to brake, just like what i saw from the JGTC driver, and the brake did less travel about a inch.

[Nose Nuggets]

Originally Posted by kawaigng

I understand that if the brake is in a good working order, we shouldnt press more than one time, but if the brake fade do happen while racing, should we double pump it?

you can pump it all you want, it wont make any diference.

I tried that, use my left foot press the brake slightly on the straight line right before I have to brake, just like what i saw from the JGTC driver, and the brake did less travel about a inch.

A JGTC driver told you he brakes slightly with his left foot, on a straightaway before the braking zone? You shouldn’t be doing any braking before the brake zone, that’s why its called the brake zone. The only think you should be doing right before the brake zone is keeping your foot pegged to the floor WFO.

[kawaigng]

Originally Posted by Nose Nuggets

you can pump it all you want, it wont make any diference.



A JGTC driver told you he brakes slightly with his left foot, on a straightaway before the braking zone? You shouldn’t be doing any braking before the brake zone, that’s why its called the brake zone. The only think you should be doing right before the brake zone is keeping your foot pegged to the floor WFO.

I saw that from a video. I will try to post that vedio on later.

[Nose Nuggets]

thats crazy.

do you remember the drivers name?

[kawaigng]

Originally Posted by Nose Nuggets

thats crazy.

do you remember the drivers name?

actually is more than one driver do that, and I will post that video next week i hope

[absolutexk]

i talked to a subaru tech about the double pumping thing, he said it has something to do with when u first press the pedal and let go, the brake pads are slowly letting out, and because its slow, when u go to press them a second time, they feel firmer, because they were closer to the rotor than usual...

[LDizzle108]

http://www.stoptech.com/tech_info/wp_knockback.shtml

Check this out. It should answer all your questions.

[Nose Nuggets]

Now, the Cobra had never exhibited knockback around town, regardless of how hard it was driven.

you have air in your system