Removing brake booster, for race?

[Blown86]

Everything changes when you go bigger brakes and pedal boxes etc.

I'm setting up 4 spots all around with a pedal box with balance bar at the moment, no booster.
You can calculate the appropriate pedal/master cylinder/slave cylinder ratios for the best balance between feel and pedal travel.

[takai]

Yeah, ive been considering going to either paired 3/4" masters or 5/8th and 3/4" twin masters with a balance bar. Currently i have a single 17/16th master with an adjustable bias valve. Ill at least run this for the first little while and see what it is like, although i am envisaging that i will have to run at least a twin master system, or even a remote pedalbox, not entirely sure yet.

[myne]

Um, why hasnt anyone pointed out the obvious?

Unlug the vacume hose from the booster. Effect? Exactly the same as removing it alltogether, only quicker. Just do not block the hole.

[Cool1]

Um, why hasnt anyone pointed out the obvious?

They have!

[takai]

Um, why hasnt anyone pointed out the obvious?

Unlug the vacume hose from the booster. Effect? Exactly the same as removing it alltogether, only quicker. Just do not block the hole.

Uh, not the same effect, then you have to move booster bladders as well as the brake master :S

[roadsailing]

yeah, and the only advantage is your brakes are harder to use.

[myne]

The diaphragm (without the vacume) would have a negligable effect on braking - feel or otherwise.

[takai]

Well, sadly, it does. It has a fairly hefty effect from the three cars ive had to drive without boosters.

[EVOSTi]

actually the rubber in the booster has a lot to do with the way the pedal feels, i think ford did a recal on them once many years ago because of it.

i think for what most people are using their cars for its better to keep the booster. i know alot of people like to say that their car is a street and track car but how often do you drive it on the track? if its less than 20% of the time (which is most of us) its probably better to lean towards a more streetable setup.

[myne]

Hrm, well, perhaps there's a simple way of reducing its' power. Some sort of vacume limiting device, to limit it to a mere 10"hg or something rather than the usual 20+

That should give a fair bit better pedal feel, without the effort of removing the booster.

[RobertoX]

What fluid do you use? There was a link on these forums posted a while ago and some of the info was quite good. One thing that they said was that a contrubuter to fade and spongey pedal was the heat affecting the fluid and causing it to get vapour bubbles in it which are compressible (like having air in your lines). I don't know how reliable this is but its food for thought.

Here: http://www.toymods.net/forums/showthread.php?t=1236


You should possibly use some high temp brake pads and also use some high performance fluid.
This might be a good starting point as these things would be cheaper and easier to replace than other components in the system.

[myne]

It's true.
Brake fluid soaks up water from the air, even through the fairly well sealed braking system.
Water boils at a mere 100*C and then suddenly becomes compressable.