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rottendan 09-29-2017 04:57 PM

Has anyone replaced the hydroboost on a ace30.1?

16ACE27 09-29-2017 05:51 PM

What's a "hydroboost"?

gmc 09-29-2017 06:15 PM

I assume it is a reference to this post:

Originally Posted by (Post 90411)
It's probably power steering fluid. Your hydro boost seal is leaking. That's where the brake pedal rod is connected to.

in this thread:

Not my comment... just building the bridge back to where it came from.

16ACE27 09-29-2017 06:20 PM

So the brake booster? Powered by vacuum, no hydro involved.

rottendan 09-29-2017 08:12 PM

It's connected to the master cylinder and the power steering pump. The rod seal is leaking and dripping on the floor under the brake pedal. It looks very difficult to remove. 09-29-2017 08:16 PM

Pop your hood. If you have a big round canister between the master cylinder and fire wall, you have a vacuum booster. If you see high pressure lines and no round canister you have a hydro boost powered with the power steering pump. And yes its hydraulic Any mechanic can change it as long as he knows how to bleed it and checks the adjustable rod from it to the master cylinder.

Beau388 09-29-2017 08:50 PM

All F-53 chassis (and most diesel pushers) use a hydro-boost or hydro-max brake booster system. This system uses the power steering pump to boost the brake line pressure. A vacuum type booster (even an 11.5" dual diaphragm vacuum booster) cannot supply the pressure and volume of brake fluid required for the anti-lock disk brake system to operate properly. The hydro-boost system is used on the 16,000/18,000 lb chassis and uses an accumulator to supply the necessary boost pressure should the power steering pump fail. The hydro-max system is used on the 20,500 lb and heavier chassis. The Hydro-max system uses a small electric pump to supply the boost fluid should the power steering pump fail.

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