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Old 12-19-2018, 09:18 AM
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Hydro-vac remote brake booster

Is anyone using a remote brake booster for front disc brakes? How well does it work? What are you using?

https://www.mpbrakes.com/pc_product_...A40191940E1C58

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Old 12-19-2018, 12:44 PM
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So your using a toyota landcruiser style hydraulic clutch to push the booster?
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Old 12-19-2018, 03:03 PM
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The problem with the hydrovac is that you only have a single circuit brake system. If space is an issue, I'd use a hydroboost unit.
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Old 12-19-2018, 05:07 PM
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Thanks for the quick replies.

Cereal; I'm unaware of using a clutch cylinder to add boost to the brakes? Please tell me more. The hydro-vac system is a vacuum brake booster (used in the 30's - 60's on cars and trucks) that mounts remotely in the brake line, it operates off of the existing brake pressure.

Joe; Unfortunately the hydro-boost pushes the master cylinder back too much, like a standard vac booster does and interferes with my frame X. I'm being told that the hydro-vac works well when used on the front brake circuit only. Looking to see if others have done this, how successful it is and which booster they used for disc brakes.
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Old 12-19-2018, 05:20 PM
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So you are planning to use a dual circuit master at the pedal and plumb the output from the front of that to the slave cylinder on the hydrovac, and then only use that for the front brakes? Sounds a little dicey. That means that you'll have power brakes on the front but not on the back. Setting front/rear brake balance will be a challenge, and if you ever loose vacuum assist (like the engine stalls), the front/rear balance will change - not exactly what you want in an emergency situation.

Do you really need a brake booster at all? With the right pedal ratio, you might not even notice the difference. For example, my 70 Olds W-30 has factory manual disc brakes (the stock can didn't provide enough vacuum). It stops just fine.

If you really must have power brakes, another option is the much maligned Powermaster unit that came factory-installed on the Buick Grand Nationals. This is essentially a master cylinder with a small, integral hydroboost that uses an external electric pump to pressurize brake fluid for the booster instead of power steering fluid. It's barely longer than a normal master cylinder. The powermaster has gotten a bad rap due to failures. Mainly this has been due to either brake fluid that needed to be changed periodically or a bad accumulator ball. If you are aware of this, the system should work just fine.



Here's a link to more information and a vendor who sells them for GMC motorhomes.

Speedway motors sells an aftermarket version, but it's pretty spendy - over twice the cost of the GM unit.
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Old 12-19-2018, 06:23 PM
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Yeah, using the front only boosted sounded a little dicey to me too, but I got it from the MPB tech, he states it work well.
The manual brakes stop great, recently my knee started acting up and I'm not quite ready for knee replacement, I thought the power boost might make it easier on my knee for now.
Thanks for the links, I looked at the electric brakes at Speedway and it is a consideration.
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