Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

Brake conversion without a booster

Started by _geewiz_ , Nov 12 2006 10:10 AM

Please log in to reply

11 replies to this topic

#1 _geewiz_

Guests

Posted 12 November 2006 - 10:10 AM

Im looking to do a brake conversion and I was curious to know what are my options, without the requirement to have a brake booster installed.

I saw a HR (I think) where the booster was located right behind the pedal box, within the cabin.. this might require more work than its worth as its pretty tight for space down there!

There are few torries goin 'round with boosters out of sight and I've always wondered where they would be relocated. Later on, I learned was told they can be remotely mounted, but at the cost of breaking performance and advised against it..

Like most people, no one is prepared to sacrifice performance or compromise safety. At the same time my objective is for a minimalistic engine bay. Its a big ask, but hey - no harm in asking

Rim size I plan on using would be either 14 or 15inch.

Any suggestions on the subject would be of value.

-gw

Back to top

#2 Struggler

Forum Fixture

Members
2,426 posts

Name:Andrew or AJ
Location:Canberra A.C.T.
Car:UC Sedan
Joined: 08-November 05

Posted 12 November 2006 - 10:28 AM

A couple of options I have seen work OK,

Fit a pedal box from a L300 or similar forward control type van (all goes under the dash),

Use a master cyl. of smaller bore dia. and no booster (still on the engine side of the firewall),

A guy I used to work with constructed a cantilever set up that mounted the booster and m/cyl perpendicular (ie at right angles) to the pedal travel plane, and fitted it all under the dash. It had to be engineered but was constructed using HQ brake pedals so everything was deemed up to scratch. MY427SS knows the vehicle I am refering to. Fairly complex, but effective.

Personally I have had a lot of success with the smaller m/cyl bore (I have used both Datsun and Mazda 13/16" bore units) but will be fitting a L300 unit to my own vehicle in the future.

I have never liked the remote boosters (performance wise), and I have also tried using a Gemini booster but it was pretty much ineffective.

DISCLAIMER What I find to be acceptable in my situation may not necc. suit you, or be legal.

I would wait for Dattoman to comment, he is the brake expert.

Back to top

#3 LS1LX

Forum Fixture

Members
1,931 posts

Location:Sydney
Joined: 22-November 05

Posted 12 November 2006 - 01:44 PM

Most of those other toranas you see at the track with a hidden booster, do NOT have a booster, thats why its hidden out of site for good.

Back to top

#4 GML-31

Oh My, Don't you post alot

Members
5,239 posts

Name:Kev
Location:Highland Park
Car:too many
Joined: 08-November 05

Posted 12 November 2006 - 02:34 PM

i know of 2 cars with remote boosters, 1 has his under the dash and the other has his under the guard both in LX toranas

Back to top

#5 dattoman

Do I feel lucky? Well, do ya, punk?

Administrators
16,473 posts

Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 12 November 2006 - 07:55 PM

Preffered method would be 2 seperate master cylinders on a balance bar assembly
As long as your not using collette style calipers

Back to top

#6 Struggler

Forum Fixture

Members
2,426 posts

Name:Andrew or AJ
Location:Canberra A.C.T.
Car:UC Sedan
Joined: 08-November 05

Posted 13 November 2006 - 07:30 AM

As long as your not using collette style calipers

Should that read "Corvette" or am I missing something.

I have also fitted a balance bar and 2x m/cyl to one of my old cars, worked great for adjusting the brake bias but I didn't think the packaging was tidy for a "show" type car. JMO

Back to top

#7 dattoman

Do I feel lucky? Well, do ya, punk?

Administrators
16,473 posts

Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 13 November 2006 - 09:41 PM

Collette
Sliding caliper

Not corvette
Which are also sliding calipers

Back to top

#8 Dr Terry

Technical + Numbers Guru + Moderator

Moderators
3,279 posts

Location:Eastwood (Sydney) NSW
Joined: 13-November 05

Posted 14 November 2006 - 10:34 AM

Hi dattoman.

What's the issue or problem using 2 m/cyls & a balance bar with Collette style calipers.

Dr Terry.

Back to top

#9 dattoman

Do I feel lucky? Well, do ya, punk?

Administrators
16,473 posts

Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 14 November 2006 - 11:12 AM

Usually its a volume defeciency Doc
A fixed caliper has little to no flex so it will work fine but a sliding caliper wanders around on the pins and gives a lower baggy pedal
It can be done....... but it requires larger master cylinders which increases pedal effort unless ratios are carefully worked out

Back to top

#10 myss427

Forum Fixture

Members
1,636 posts

Location:Canberra
Car:427 hatch, CV8 Monaro, Ve SSV ute. Was part owner A9X sedan until he sold it without telling me!
Joined: 17-November 05

View Garage

Posted 14 November 2006 - 02:37 PM

There is another option I am looking at (I have no booster) Its a hydrollic pump that mount between the master cylinder and the fire wall, it runs off a power steering pump and needs no vacumme. Great for cars with big cams. Here is the web address http://www.hydratech...ucts/universal/

Edited by myss427, 14 November 2006 - 02:38 PM.

Back to top

#11 Toranamat69

Forum R&D Officer

Members
2,117 posts

Location:Brisbane
Joined: 07-November 05

Posted 14 November 2006 - 05:50 PM

G'day Brett,

I saw those too - in the summit catalog.

http://store.summitr...15&autoview=sku

Good for low vacuum applications but if you are getting rid of the vac booster to clear the engine bay, the hydraulic ones are going backwards with the extra lines and pump you need.

I wonder if you can run the brakes and steering from the one pump?

M@

Back to top

#12 _CHOPPER_

Guests

Posted 16 November 2006 - 07:33 PM

That would depend on the pump output and the requirements of the booster and power box/rack. I personally wouldn't if it were a streeter. Drag car, yes. Mainly because you probably wouldn't be on the brakes whilst trying to turn a drag car. At least not at speed.