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Old 08-05-2012, 09:15 PM   #1
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Hydro boost brakes

I have a 1989 Winnebago Warrior on a Chevy chassis. My brakes feel like they are manual. All the fluid levels are fine. Any ideas?
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Old 08-06-2012, 03:33 AM   #2
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So you have no "power" in your power brakes, right?

How's the power steering?

Hydraulic pump pressures could be down.

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Old 08-06-2012, 07:03 AM   #3
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Power steering is fine.
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Old 08-06-2012, 10:18 AM   #4
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Though uncommon, hydroboost units DO go bad.

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Old 08-06-2012, 11:07 AM   #5
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Is that the unit mounted behind the master cylinder?
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Old 08-06-2012, 11:20 AM   #6
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Unless they changed in 89, my old 84 coach on the GM chassis had a vacuum brake booster. If there's a vacuum leak or the booster diaphragm is bad then it will require very heavy pressure on the brake pedal. The master cylinder will be mounted on the front of the cylindrical booster unit.
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Old 08-06-2012, 12:36 PM   #7
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Is that the unit mounted behind the master cylinder?
Yes it actually is in front but it bolts directly to the MC. I changed mine out recently. My brakes would stop the rig but it look lots of pedal pressure and I never felt confident.
Took 1/2 day to get it off and less back on. Better braking now with a bit higher pedal. I can skid the tires if need be, before I could not.

Under $200 with fluid.

'87 Southwind 28Y.
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Old 08-08-2012, 06:47 PM   #8
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Do you recall where you purchased the unit? Was it new or reman?
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Old 08-08-2012, 07:32 PM   #9
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Do you recall where you purchased the unit? Was it new or reman?
My local AP (mom and pop), it is a rebuilt.
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Old 08-08-2012, 07:44 PM   #10
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No problems? I keep hearing horror stories about reman.
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Old 08-08-2012, 08:29 PM   #11
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No problems? I keep hearing horror stories about reman.
No problems.
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Old 08-08-2012, 08:34 PM   #12
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Thanks, finding a new one is like finding a needle...
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Old 08-09-2012, 06:14 PM   #13
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I ordered the new parts today. Hopefully i'll have brakes by tomorrow afternoon.
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Old 08-10-2012, 03:11 PM   #14
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Ok, new boost is installed. The result wasn't as good as I expected but much better then they were.
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