2000 replies to this topic

[kakabox]

...NA Booster continued:

I noticed that there still seemed to be deflection in the booster when the pedal side push rod was moved. Taking apart the valve body, I found two springs which allowed some deflection before the pedal's force was transferred to the mc.


I replaced the two springs w/two 0.80 diameter, .75 thick delrin spacers:


...it's solid now!

Since the booster is now NA, I didn't want it to act like a piston pumping air everytime I hit the brakes...so I removed the diaphragm:


...I also cut off the vacuum line 'nipple' from the front cover since it will no longer be used:


I painted the front cover and reassembled the 'booster' w/o any of the seals & boots required to prevent vacuum leaks, since they were no longer necessary.


...gee, looks like I forgot a few parts!



The NA booster is now a direct, solid connection btwn the pedal and the mc...in theory, the brake pedal should feel much firmer...we shall see!

Cheers!

Edited by kakabox, 02 July 2006 - 02:43 PM.

[lxndr]

Someday, when the Kakabox is in the PAP car cemetary, someone will be very confused to find $1 in the brake booster.

Just imagine the bewilderment as it washes over them, then how happy they will be when they realize that your booster just paid for half of their admission!

Your booster will be like a tiny time capsule. I love it!

Edited by lxndr, 02 July 2006 - 04:55 AM.

[badpenny]

After the retainer and spring are removed, remove the mc output rod retainer and output rod and...what's this?  It looks like a source of a mushy pedal! 

<{POST_SNAPBACK}>

Could replacing this disk be a good way to remedy pedal travel in a "non-racing" repair of someones brake booster?

[strudel]

Just imagine the bewilderment as it washes over them, then how happy they will be when they realize that your booster just paid for half of their admission!

Actually when this all transpires the numismatic value of these coins will be so greate that they could probably buy a complete CRX/Civic! JS

[crazi-85crx]

NA Brake Booster

Another great KAKA-Exclusive writeup! Very cool! I will be giving this a try when I upgrade my braking system.

[kakabox]

Could replacing this disk be a good way to remedy pedal travel in a "non-racing" repair of someones brake booster?

<{POST_SNAPBACK}>

Maybe some, but probably not all of the travel. You should be able to reduce the 'mushiness' of the pedal somewhat by just replacing the rubber disc w/a solid one...and still retain the vacuum boost.

From what I could tell, most of the travel seems to come from the 'valve body' w/it's inner and outer 'valve springs'. Replacing the springs w/spacers such as I did, defeats the valving of the vacuum, probably rendering the booster useless in providing braking assistance.

I agree w/jsgprod's statement, however: "It really makes me wonder why they even put power brakes on these things, you don't need it. Not only that, the brake pedal feel is dramatically improved!"

...I'm looking fwd to a more linear, direct brake pedal and feel w/this mod.


Cheers!

Edited by kakabox, 02 July 2006 - 03:06 PM.

[badpenny]

Could replacing this disk be a good way to remedy pedal travel in a "non-racing" repair of someones brake booster?

<{POST_SNAPBACK}>

Maybe some, but probably not all of the travel. You should be able to reduce the 'mushiness' of the pedal somewhat by just replacing the rubber disc w/a solid one...and still retain the vacuum boost.

From what I could tell, most of the travel seems to come from the 'valve body' w/it's inner and outer 'valve springs'. Replacing the springs w/spacers such as I did, defeats the valving of the vacuum, probably rendering the booster useless in providing braking assistance.

I agree w/jsgprod's statement, however: "It really makes me wonder why they even put power brakes on these things, you don't need it. Not only that, the brake pedal feel is dramatically improved!"

...I'm looking fwd to a more linear, direct brake pedal and feel w/this mod.


Cheers!

<{POST_SNAPBACK}>

This is an excellent idea for dd applications as long as it doesn't lock up your brakes everytime you apply them. I thought the booster helped keep the brakes from locking up?

[kakabox]

Just imagine the bewilderment as it washes over them, then how happy they will be when they realize that your booster just paid for half of their admission!

Actually when this all transpires the numismatic value of these coins will be so greate that they could probably buy a complete CRX/Civic! JS

<{POST_SNAPBACK}>

...maybe I should stick a "Money Inside" sticker on the outside of the booster to alert the PAP maggots! ...but, stand aside as they'll all be rushing to 'pee on it' to claim it as theirs!

[toxicshit]

hey kakabox another good idea for my project thnx for the writeup !!

[kakabox]

This is an excellent idea for dd applications as long as it doesn't lock up your brakes everytime you apply them.  I thought the booster helped keep the brakes from locking up?

<{POST_SNAPBACK}>

No, the booster's job is too provide some additional force in actuating the mc...so you don't have to press down on the brake pedal as hard.

If anything, the booster actually promotes brake lock-up by magnifying your leg force, pushing the fluid harder than sometimes you'd like...like in a panic stop situ.

That's why a booster-less brake system is sometime easier to modulate, since your leg pressure is more linearly related to the braking function. You have more 'feel'.

Edited by kakabox, 02 July 2006 - 03:24 PM.

[Aren D.]

SWEET!

[Screech]

Nice work as always. I need to take time to take more pictures, just too busy and hands are too dirty to grab the camera most of the time.

[oldschoolimport]

so by doing this, you can hog out the hole for a larger MC, without having to worry about keeping it sealed, so as not to loose vacuum?

[kakabox]

so by doing this, you can hog out the hole for a larger MC, without having to worry about keeping it sealed, so as not to loose vacuum?

<{POST_SNAPBACK}>

Yes...like enlarging the hole for a 'teg mc! As long as the you keep the enlarged hole somewhat centered I don't see a problem w/that.

So, there's another option for the 'teg disc brake swap: make a NA booster and enlarge the hole for the 'teg mc!

[kakabox]

Finishing the Integra Type 'R' Rear Stabar Install:

I finally got around to finishing the install of the itr rear stabar...just so you know, I did try to 'chassis' mount the bar w/drop links to the axle, but I just couldn't make it work w/this bar, so: axle mount it is w/all it's evil unsprung wt!

...anyway, here are the drop link chassis brackets I made out of 2 x 2 x 3/16 angle:


...they bolt up to the frame rails where the rear tow hooks used to go.

Here's the drop link parts: 3/8" stainless female rod ends and matching jackscrews from http://www.midwestcontrol.com/


Here's the left drop link installed:


...and the passenger side:


With the ITR stabar's short lever arms and 22 mm (7/8") diameter, this bar should provide plenty of rear roll stiffness.


Here's the big picture...


Cheers!

Edited by kakabox, 07 July 2006 - 09:16 AM.