BMW Hydroboost Reservoir

Patb Mon Sep 10, 2012 3:31 pm

I'm running a BMW Hydroboost setup with the stock ls1 F body pump and reservoir. I find the brakes run well with no bad habits other than the reservoir on the pump can't handle the excess fluid stored in the "Bomb" when the brakes are operated with the engine off.
Is anyone else running this setup? How did you solve this problem?

Thanks
Pat

87-944S Mon Sep 10, 2012 6:01 pm

Hi Pat, I'm still setting mine up, just rebuilt the booster, fabbed a mount, etc. I will use the BMW reservoir, and lose the GM one on the pump.

How is the boost, does it come on right away? What M/C are you using?

Patb Mon Sep 10, 2012 8:00 pm

Thanks Mike,
I've only driven it a few quick times around the block, I was so distracted by the pedal on the right that I hardly thought about the one in the middle. I never drove it with the stock booster but I bet it's close.
I'll be swapping the reservoir out to keep the fluid in, I should have done that from the start but the GM setup is so compact and easy.

87-944S Mon Sep 10, 2012 8:29 pm

Lots of return hoses with the BMW setup. The reservoir has an internal baffle, to keep things under control, not sure the capacity, but looks to be at least a quart, also not sure where the filll line is. Smile

Patb Tue Sep 11, 2012 7:12 pm

I'd start with the level low, bleed everything, then pump the bomb down and fill the reservoir as needed.
I was surprised how much fluid the thing held.
where is your reservoir? stock spot?
Pat

87-944S Tue Sep 11, 2012 8:22 pm

Good advice, thanks. I was hoping to mount it up near the firewall, but it will go in the stock location. I'm removing the BMW mount on the reservoir, stripping and repainting it. Hydraulic hoses for the return lines came in yesterday, so plumbing can begin.

I am planning to mount the regulator/bomb behind driver's headlight, for the shortest high pressure line setup. Where did you mount yours?

Patb Wed Sep 12, 2012 7:25 pm

That's where I put it. The arm on the back of the light misses it by 1/4".
I did remove the sender/switch on top of the bomb to slide it up some.
Have you driven your car yet?
Pat

87-944S Wed Sep 12, 2012 7:39 pm

I've driven it around the neighborhood with dual master manual brakes, not boosted yet. Looking forward to trying it boosted.

Red944ls1 Fri Nov 23, 2012 8:08 pm

Hi Pat...can you post pictures of your setup? I just picked up the BMW hydro boost setup today .

Thanks for your help

Patb Sun Nov 25, 2012 7:15 am

Hi Red
Sorry for the delay. I'm out of town and have very few pics with me.
Pm and I will send (I can't post from my phone)
I can tell you I cut the cerial bowl to fit with the stock master.
The bomb is behind the driver head light with the reservoir in the stock location.
I think I ran the booster return direct to the reservoir and tee'd the steering and bomb returns.
The stock ls1 pump has a copper pipe to solder fitting pressed in with a 90 deg pipe to flare.
Hope that helps.
This cars a blast, runs like a scared rabbit
Pat

87-944S Sun Nov 25, 2012 2:03 pm

Here's how I mounted the regulator and bomb, I made a bracket out of 1/8 steel I had laying around:

BMW Hydroboost Reservoir Img_1520

I used Russell Performance Powerflex hose and fittings for the high pressure lines.

BMW Hydroboost Reservoir 20121111

Here's the PS pump with the high pressure and low pressure lines attached. I started using heat shrink clamps for all my low pressure lines for the power steering and for the heater hoses. Nice clean look. Smile

I put the reservoir in the original Porsche spot, I cut off the top part of the mount so the reservoir would fit flush:

BMW Hydroboost Reservoir 20121010

Red944ls1 Wed Jan 02, 2013 10:10 pm

What did you guys do about the connects on the steering rack?

Patb Thu Jan 03, 2013 8:00 pm

I used the porsche stuff. The return is just a hose push on with a clamp. The supply I had a hose shop use the old banjo with a new hose.
Hope that helps

tkrame944 Sat Feb 02, 2013 9:45 am

Hey ive been gathering all the parts to put my bmw set up together and i was wondering what are the sizes and threads to the fittings you used on the bomb, i was going to have a hose shop make all my lines for me but your set up looks a lot easier and better.

BMW Hydroboost Reservoir

BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

BMW Hydroboost

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

Re: BMW Hydroboost Reservoir

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