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Thread: Hydroboost
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Old 09-29-2017, 09:50 PM   #7
Beau388
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 2,234
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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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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