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Old 04-07-2018, 08:28 AM   #1
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Newbie w/question on P32 brakes

Im new here and not sure where to place this thread... I just purchased a 2002 R Vision Condor. It's on a P32 chassis. The brakes are compromised to the point of being non functional. Although pressing the pedal applies caliper pressure, (slowely stoping the RV) the pedal goes to the floor but does not return. The required pressure is substantial yet the breaking force is minimal. It is possible to pull the pedal back but it also requires substantial effort. I do not believe it's a case of simply applying lube or installing a grease fitting. Thanks in advance for suggestions.
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Old 04-07-2018, 09:30 AM   #2
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Welcome to iRV2.

Sorry you're here with problems and a huge safety issue.

There may be info on possible solutions for your problem in the "Workhorse Custom Chassis " section of the Chassis Club forums.

If your using a PC to access the forums , hover the cursor on the " RV Forums "
drop box ( in the bar across the page , under the picture ,across the top )and click on " Workhorse Custom Chassis "
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Old 04-07-2018, 10:19 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with the brake problem!

Good luck, happy trails, and God bless!
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Old 04-07-2018, 10:39 AM   #4
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Your brakes

Although I also am new at RVing I am a mechanic. Sounds like your Master cylinder is going bad if this is a hydraulic system. First check the fluid level and make sure it is full. At that point pump the pedal and see if it comes back. If this is an air brake system then the air control valve usually located near the pedal is the culprit.
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Old 04-07-2018, 10:52 AM   #5
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Quote:
Originally Posted by Bodhi View Post
Im new here and not sure where to place this thread... I just purchased a 2002 R Vision Condor. It's on a P32 chassis. The brakes are compromised to the point of being non functional. Although pressing the pedal applies caliper pressure, (slowely stoping the RV) the pedal goes to the floor but does not return. The required pressure is substantial yet the breaking force is minimal. It is possible to pull the pedal back but it also requires substantial effort. I do not believe it's a case of simply applying lube or installing a grease fitting. Thanks in advance for suggestions.
Bodhi
Possible that the hoses are collapsed and not at all uncommon with this chassis, but usually that causes the calipers to remain on the rotors and drag for a spell and because the fluid isn't returning to the MC. I'd probably be guessing the Master Cylinder in your case, but will take some sorting out for verification.
I'd first fill the MC and bleed them before going further.
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Old 04-07-2018, 11:20 AM   #6
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Quote:
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Possible that the hoses are collapsed and not at all uncommon with this chassis, but usually that causes the calipers to remain on the rotors and drag for a spell and because the fluid isn't returning to the MC. I'd probably be guessing the Master Cylinder in your case, but will take some sorting out for verification.
I'd first fill the MC and bleed them before going further.
Not familiar with your chassis, but if it has hydraulic brakes, the above post makes the best sense to me as well, regarding the bad MC.

A bad MC can allow hydraulic fluid to seep past the seals as the piston is depressed which does two things--first, it reduces the pressure out to the lines/calipers lowering the effect of the caliper and second, the fluid is now collected behind the piston in the MC making the return of the piston to it rest position via the internal spring, nearly impossible.

Again, don't know if you have a hydraulic system but if so, the MC is the prime suspect, IMO.
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Old 04-07-2018, 11:35 AM   #7
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You should have a Workhorse chassis. Check the linkage for binding from the brake pedal to the hydroboost unit. If the coach has been sitting for some time ,it could have rusted. If the linkage is free, quite possibly the hydro boost unit requires replacement.
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Old 04-07-2018, 12:06 PM   #8
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I checked the linkage, no visual corrosion or binding. From the little I've read on the hydraulic brake system for the WH P32, the assist comes from the power steering pump in lieu of manifold vacumn pressure, correct?
1. So, with the engine running, required brake pressure should be far less than when the engine is off. The required brake pressure remains constant regardless of engine running/not running. Conclusion: hydro boost is not functioning. Is the hydroboost simply a shunt line from the pump to the positive pressure side of a servo diaphragm (opposite of vacumn assist) or is there additional valving/mechanism involved.
2. I tend to agree with those stating the MC seals may be bad. Is R&R on a MC a big job on this coach?

Thanks to all that responded! I can see this forum is going to be a great resource. Glad I joined!
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Old 04-07-2018, 07:50 PM   #9
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Quote:
Originally Posted by Bodhi View Post
I checked the linkage, no visual corrosion or binding. From the little I've read on the hydraulic brake system for the WH P32, the assist comes from the power steering pump in lieu of manifold vacumn pressure, correct?
1. So, with the engine running, required brake pressure should be far less than when the engine is off. The required brake pressure remains constant regardless of engine running/not running. Conclusion: hydro boost is not functioning. Is the hydroboost simply a shunt line from the pump to the positive pressure side of a servo diaphragm (opposite of vacumn assist) or is there additional valving/mechanism involved.
2. I tend to agree with those stating the MC seals may be bad. Is R&R on a MC a big job on this coach?

Thanks to all that responded! I can see this forum is going to be a great resource. Glad I joined!
Probably not the easiest change and a lot of the work might be from down under, but not the worst job, either. Since the hydro-boost has been brought up and one that I didn't initially think of, be sure to check that out first, keeping in mind that it also assists the steering. If the steering is OK, then the pump itself should be OK.
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Old 04-07-2018, 08:09 PM   #10
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If your master cylinder is turned 90 degrees to the pedal, there is a bellcrank in there that seizes up.

You need to see if that's binding before you start throwing parts at it.
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Old 04-08-2018, 02:36 PM   #11
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This is from the Workhorse forum but has P-32 brake information and maybe who to contact to help solve problems.

P-32 BRAKE SEARCH

Welcome to irv2 information for Newbies.
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