LRA Hydroboost Brake Upgrade Kit - replacement for vacuum pump assisted brakes

[twr7cx]

So, anyone used the Les Richmond Automotive Hydroboost Brake Upgrade Kit?

Hydroboost brake upgrade kit (http://www.lrautomotive.com.au/contents/en-us/d4944_Hydroboost_kit.html)


Hydroboost brake upgrade kitBrake booster upgrades for Land Rover, Range Rover Classics and Discovery Series 1 and 2
This kit is designed to increase the brake pedal response and reliability. By removing the vacuum assisted booster and master cylinder and replacing it with a hydroboost unit kit which instead of relying on vacuum from the engine or an inadequate vacuum pump on diesel models uses 1000psi of hydraulic pressure piggy backed off the existing power steering system. Perfect brakes every time no matter how many times you apply the brakes. Also increases brake pressure at the calipers for far superior brake efficiency.
A must for .... Towing, Larger Tyres etc.

Perfect brakes every time.

l_fitted hydro.jpg (http://www.lrautomotive.com.au/contents/media/l_fitted%20hydro.jpg)
hydroboost kit.jpg (http://www.lrautomotive.com.au/contents/media/hydroboost%20kit.jpg)
bridge lines.jpg (http://www.lrautomotive.com.au/contents/media/bridge%20lines.jpg)

[Pateyw]

Yes have fitted a hydroboost brake system to my defender .
its not from LRA but it works a great deal better than the standard brake system.
Also it hasn't affected my steering as some would have you believe.

[67hardtop]

No brake assist when engine turned off????
Like old c20 chev utes or trucks????

[Ancient Mariner]

Some info in my members ride thread

[rangieman]

No brake assist when engine turned off????
Like old c20 chev utes or trucks????
No Different to vacuum assisted brakes on 99% of cars [wink11]

[67hardtop]

Still get a couple applications b4 u lose the brakes. Was asking the question not making a statement. Thats usually what these things???? mean.

Cheers Rod

[BathurstTom]

Lose the fan belt and lose your brakes? No thanks.

Tom

[goingbush]

I fitted a Hydroboost & Mastercylinder from a 2006 Suburbain to my Iveco inplace of the dual diaphragm booster & Bosch MC on my iveco . The braking is vastly superior , I get 5 full power pumps after engine switched off due to the accumulator on the HB unit . No change to steering even at walking pace / parking speed. Best thing since sliced bread . The PS pump on the Iveco as on the Defender is driven from the timing mechanism, so belt failure thing is a furphy.

[DeanoH]

The Oka has a 4 wheel disc brake hydroboost braking system as standard with front and rear disc/calipers the same. Not bad for an early 90's vehicle and with the hydraulic pump cam/gear driven brakes and power steering are independent of the fan belt. A very efficient and reliable way of doing things.

Deano :)

[twr7cx]

Lose the fan belt and lose your brakes? No thanks.

I think you would only loose the assistance to the brakes. Isn't the vacuum pump on the engine currently fan belt driven anyway so no change?

[blackrangie]

Lose the fan belt and lose your brakes? No thanks.

TomNo..they have backup reserve

[blackrangie]

I have on mine from LRA, used a PSC racing hydro res with expansion tank and it works great

[croc]

Hi All
I was thinking of adding front disc brakes and power assisted dual system to my 1976 series3 SWB. As there is no power steering on this model is it possible to fit Hydroboost upgrade ?
Generally am I on the right track to inprove the safe brakeing of my Landie.
Thanks
Geoff

[blackrangie]

Hi All
I was thinking of adding front disc brakes and power assisted dual system to my 1976 series3 SWB. As there is no power steering on this model is it possible to fit Hydroboost upgrade ?
Generally am I on the right track to inprove the safe brakeing of my Landie.
Thanks
GeoffWould just need hydro pump of some kind, either power steering pump or pto hydro pump?

[Tins]

Lose the fan belt and lose your brakes? No thanks.

Tom

Not possible. ADRs state that in the event of a failure of braking assistance ( such as the vacuum system, or the Hydroboost system ), there must be the capacity for four full brake applications before all assistance is gone. LRA is unlikely to ignore that.

Also, all braking systems must allow for unassisted braking as well, so there would be no loss of brakes even after the assistance is gone. The pedal would get harder, and the effort required would also increase, but the car would still stop.

[twr7cx]

So for those that have actually fitted and are running one, are they worth it for the pennies? Are the brakes significantly better?

[350RRC]

How much is this kit?

DL

[blackrangie]

So for those that have actually fitted and are running one, are they worth it for the pennies? Are the brakes significantly better?Yes, Yes

[twr7cx]

Yes have fitted a hydroboost brake system to my defender .
its not from LRA but it works a great deal better than the standard brake system.

Where did you source yours from?


Have just purchased a D4 for the misses and been driving it a bit I've realised how lacking the D2a's brakes are, hence the revival of this. I think it's time.

[blackrangie]

Where did you source yours from?


Have just purchased a D4 for the misses and been driving it a bit I've realised how lacking the D2a's brakes are, hence the revival of this. I think it's time.Only thing to consider would be legalities of removing ABS? May have to be engineered, Or is there a way to add hydroboost to ABS vehicle.

[goingbush]

The hydrobooster simply replaces the vacuum booster , no changes to ABS or anything else are required.

I bought a brand new genuine GM Tahoe A/C Delco Hydroboost unit from USA for $350 delivered , (Why you'd pay $2500 ++ for a local kit with Cardone aftermarket booster is beyond me ) and had the appropriate hoses & adaptors made by Wang Hydraulics for $250 . Used a Chevy astro van mount plate.

[Bigbjorn]

Smokey Yunick developed power brakes using residual power steering pressure about 50 years or more ago but NASCAR refused permission to use it. He did use it on Indy cars where the rule book was much thinner.

Edit - He first used it in 1959 on the works cars he built for Pontiac. They had variable ratio power steering which was also a Smokey invention. Drum brakes as Nascar did not approve discs until 1971. Nascar told the team to take this stuff off. Driver, Fireball Roberts did not want the innovations until he ran a race with the PS and brakes. Fireball was alleged to have gone looking for Nascar tech manager with malice aforethought armed with the removed brake unit to feloniously insert or bash the techies with. Smokey actually did assault Joe Hunt at Indy with a faulty Joe Hunt magneto. Belted him in the head with the faulty unit. These were more robust times.

[goingbush]

Ive gone the other way with my EV and removed the Vacuum assist completely . Altogether much better .
Raised the Master cylinder and fulcrum pin to get better MA, also decreased the MC bore size , Better pedal , more feel , and about the same effort as assisted brakes. Best thing don't need a noisy vacuum pump.

http://goingbush.com/AULRO/233-2.jpg

[blackrangie]

Gm hydroboost adapted to RRC, Res, steering box, pump and cooler in system.https://uploads.tapatalk-cdn.com/20190429/42b9efb08571ed34e1c9524d28e18a2b.jpg

[twr7cx]

Only thing to consider would be legalities of removing ABS?

It definitely would be an issue if the ABS was removed, but my understanding is that it replaces the master cylinder and vacuum booster only. ABS is further down the line so should still remain there.

[J70nty]

The hydrobooster simply replaces the vacuum booster , no changes to ABS or anything else are required.

I bought a brand new genuine GM Tahoe A/C Delco Hydroboost unit from USA for $350 delivered , (Why you'd pay $2500 ++ for a local kit with Cardone aftermarket booster is beyond me ) and had the appropriate hoses & adaptors made by Wang Hydraulics for $250 . Used a Chevy astro van mount plate.

Did you keep the Land Rover Master cylinder and reservoir? Or use the GM one? Or other?

[goingbush]

Did you keep the Land Rover Master cylinder and reservoir? Or use the GM one? Or other?

You can use any master cylinder that you can make fit & will suit your requirement. In that case I used a GM unit. .

On my Electric LandRover I removed the booster altogether & made an adaptor to mount a much smaller Datsun 120Y Master Cylinder direct to the pedal .

https://scontent-syd2-1.xx.fbcdn.net/v/t1.0-9/62438630_2264215836993527_7603400236404310016_o.jp g?_nc_cat=111&_nc_ohc=uZPBt3GS9XwAX8qcw35&_nc_ht=scontent-syd2-1.xx&oh=93bf744f785778adc7f21ef96421d4d6&oe=5EB5A094

[Blknight.aus]

the only issue with the hydroboost system that I'm aware of outside of additional leak points (and this is not landrover specific) is that at low RPMs (or stalled engine) if you're into the brakes hard enough for the ABS to engage you can run low on hydraulic assist.

[Ancient Mariner]

the only issue with the hydroboost system that I'm aware of outside of additional leak points (and this is not landrover specific) is that at low RPMs (or stalled engine) if you're into the brakes hard enough for the ABS to engage you can run low on hydraulic assist. With a stalled engine you still have assistance for a couple of applications from the accumulator
Isuzu have the option of a dual pump I have one sitting here but have never felt the need to fit it in the 4 years I have had the hydroboost fitted .Seal kits were available for the Hb about $30 when I looked. I have not checked the PSI or GPM of the Isuzu versus the LR so there could be a difference
Noel

[Blknight.aus]

With a stalled engine you still have assistance for a couple of applications from the accumulator
Isuzu have the option of a dual pump I have one sitting here but have never felt the need to fit it in the 4 years I have had the hydroboost fitted .Seal kits were available for the Hb about $30 when I looked. I have not checked the PSI or GPM of the Isuzu versus the LR so there could be a difference
Noel

no issue with that it provides some applications from the accumulator, thats an ADR and pretty much has been since vac brakes came about.

the issue for me is that on some vehicles if you get hard into the ABS at low engine revs (or with a stalled engine) you can burn through the accumulator while still in ABS due to the way the ABS pulses the pedal as feedback

[goingbush]

no issue with that it provides some applications from the accumulator, thats an ADR and pretty much has been since vac brakes came about.

the issue for me is that on some vehicles if you get hard into the ABS at low engine revs (or with a stalled engine) you can burn through the accumulator while still in ABS due to the way the ABS pulses the pedal as feedback

yes , noted with my HB, the accumulator is gone before you have time to say WTF , even with the vehicle almost stationary and without any indication the ABS is working, with ABS OFF it holds up OK . ( I always switch ABS off on dirt.,)

[powerband]

Hi, I have a 6x6 civilian that I have fitted discs to the rear which has certainly improved the brakes. I was looking at getting the master cylinder reconditioned as well as the vacuum side of things. Then along came hydroboost which I had never heard of & does not seem to be well known. So will fitting one be a better way to go? The steering pump is gear driven so a good start. What pump would I use for 6 calipers?

Thank you Paul.

[Blknight.aus]

youd use the same one as the 4x4 version.

as you have no ABS to worry about the 6x6 is an ideal candidate for hydroboost so long as the powersteering box doesnt leak out on you.

I'd reccomend fitting a larger accumulator and reservoir

[MLD]

A thread revival. to those that fitted Hydroboost brakes can i ask some Q's

1) how did you connect the hydroboost rod to the brake pedal. Some seem to have a single eyelet for a clevis pin and others a U shaped end. Is 1 style preferable to the other. any tips and suggestions for ideal location to connect to brake pedal arm? Any mods to firewall or other bits under the dash that i need to think about? pics of the pedal connection would be a treat.

2) the GM hydrobooster is ideal between 1300 and 1600 psi. Not sure what PSI is the LR power steering pump but the power steering box is 900 to 1000 psi. Did people find the LR PSP adequate for the brakes. I'm doing a GM truck 6.0L conversion. The GM PSP is about 1450 psi so have 2 options. change the internal restrictor in the pump to 1000 psi (PSC motorsport sell a replacement internal valve) or use a Heidts style adjustable relief valve inline between the hydroboost and PSB.

3) for a D130 that is often loaded heavy, should i stick to the 1-1/8 master cylinder bore that is standard on the GM trucks. I assume yes as my kerb weight is comparable to the tare of a silverado 2500HD.

4) is heat a problem that i should plan on a cooler in the system.

many thanks in advance

[MLD]

Can i add another Q

5) How did people address the GM imperial master cylinder thread to LR metric male thread. Seems LR uses an odd size pressure line (3/16th). AFAIK LR uses M12x1 and M10x1. Did people swap the nipple to suit the GM thread using 3/16th (4.75mm) line. Or use a adaptor union that steps down from the GM to LR thread?

thanks in advance, MLD