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Brake conversion without a booster

Started by _geewiz_ , Nov 12 2006 10:10 AM

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11 replies to this topic

#1 _geewiz_

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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

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#2 Struggler

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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.

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#3 LS1LX

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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.

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#4 GML-31

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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

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#5 dattoman

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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

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#6 Struggler

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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

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#7 dattoman

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Posted 13 November 2006 - 09:41 PM

Collette
Sliding caliper

Not corvette
Which are also sliding calipers

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#8 Dr Terry

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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.

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#9 dattoman

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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

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#10 myss427

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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.

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#11 Toranamat69

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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@

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#12 _CHOPPER_

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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.