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Old 09-29-2017, 05:57 PM   #1
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Brand: Thor Motor Coach
State: Pennsylvania
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THOR #1281
Hydroboost

Has anyone replaced the hydroboost on a ace30.1?
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Old 09-29-2017, 06:51 PM   #2
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Model: ACE 27.1
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THOR #7035
What's a "hydroboost"?
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Old 09-29-2017, 07:15 PM   #3
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I assume it is a reference to this post:
Quote:
Originally Posted by Trkyte@msn.com View Post
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: http://www.thorforums.com/forums/f8/...luid-9426.html

Not my comment... just building the bridge back to where it came from.
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Old 09-29-2017, 07:20 PM   #4
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THOR #7035
So the brake booster? Powered by vacuum, no hydro involved.
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Old 09-29-2017, 09:12 PM   #5
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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.
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Old 09-29-2017, 09:16 PM   #6
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Model: 29h outlaw
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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.
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Old 09-29-2017, 09:50 PM   #7
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Model: Hurricane 31S
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THOR #6411
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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