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Old 01-03-2006, 08:09 PM   #1
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brake question, Motor Home

Hello,

I am not real happy with the way the 1985 325 MH stops. I put all new
pads and did all the necessary things for the repairs. My questions is:;
Has anyone ever thought about or tried to use a 2 or 3 piston caliper instead
of the one piston that is on the P30 chassis. I was at the local parts store
a couple of weeks ago and on the bench set a nice looking 3 piston caliper.
I have no Idea as to what it was from but it did give me the idea. I am trying to persue this idea on other sites but thought I would pose the question here.

Thanks for any replys. (Mixednuts)
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Old 01-03-2006, 08:26 PM   #2
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Perhaps?

Odd,

To directly answer your question - yes, additional pistons would help - it's all about clamping force!

Perhaps converting the rear to disc would be the way to go. If I remember right the P-30 used disc/front and drums/rear - correct? There are a lot of after market disc setups available - converting your rear end would seem a good choice.

Most vehicles today incorporate 4 wheel disc brakes.

Just my two cents.

Regards,
Henry
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Old 01-03-2006, 09:18 PM   #3
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Quote:
Originally Posted by axleman
Perhaps converting the rear to disc would be the way to go. If I remember right the P-30 used disc/front and drums/rear - correct?
Henry - I'm not sure when they switched but by 85 they had disc brakes on the rears as well. The tag axle brakes on the 325 are drums and are the same electric brakes as on the trailer.

Orland, what about the current breaking is not "right"? My concern would be that you might end up making a large investment in aftermarket equipment with only a marginal improvement in performance. I assume the tag brakes are setup and the brake controller is "dialed in?" I know my braking performance improved considerably when I realized the PO had disconnected the tag axle breaks. I ended up getting the drums machined and installing new brake components and magnets and it was like "Oh, THAT'S how it's supposed to break!".
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Old 01-04-2006, 12:20 PM   #4
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Reply to brake question

Yes the 325 has disc brakes all four corners. They have all been rebuilt
and repaired. The tag axle has been repaired and rebuilt also. I have a
little bit of concern when running in stop and go traffic such as a stop along
the express way were your stopped for several miles. Last year north of of
Tampa on I-75. There was so much stopping. I just get moving good and
the vehicle in front slams on the red lights and I have just got rolling good
probably 25 to 30 MPH and bang I got to stomp with all my might from giving
him a very hard enema, So far I have always got stopped in time but it sure
has been close. When I try to keep more space between me and the vehicle
in front some one else will dive in there as soon as you back off a bit! I
haven't been on the road much since I rebuilt all 4 corners of the disc
brakes. I just thought someone may have tried it or thought about it.

Thanks for all the input from each of you.
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Old 01-04-2006, 12:24 PM   #5
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If it requires a lot of pedal pressure to stop then you might have a problem with your booster system not your brake system. It could be a loose belt, low power steering fluid, a failing pump or hydroboost unit or a leak in the high pressure circuit to the Master Cylinder.

Do you have a hard time steering when this happens?
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Old 01-04-2006, 12:45 PM   #6
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brakes

I haven't or had not noticed a steering problem during this particular event.
I would have to say that I was not looking for a steering problem either. It
will be in March before we hit the road again so that will be a good time to give it a good test again. I am considering going to Chicago and picking up
route 66 and heading west for a few weeks. Has anyone ever done that
with your MO or Trailer?

Thanks for the replys


Mixednuts
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Old 01-04-2006, 12:54 PM   #7
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Did it in my moho. But we stayed on interstates (on or near the original R66) from OK to Las Vegas. Very cool trip indeed. If you come down from Chicago through Louisville stop in and say hello.

Try a slow-speed, hard (but controlled) braking test in a parking lot and attempt to turn the wheel at the same time. If you notice it's hard to steer or the power steering comes on and off (pulsing) then you have a problem somewhere in your power boost system.

Let us know what you find out.

PS - kind of cool that your 66th post was about a trip on 66! Coincidence - I think not.
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Old 01-04-2006, 02:34 PM   #8
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brake question

I wasn't counting my posts but it is interesting isn't it. I don't know where
the Route 66 goes but if it goes near you, we could stop off. we went
thru Louisville two years ago when we came back from Alabama. I will have
to try out the road tests at a time when I am ready to go on a trip. My MO
is in the back yard with snow on top and snow all around the unit. We are
loosing snow fast the last few days. Two weeks ago we had over 12" on
the ground and now about 3" left. Supposed to snow in the next couple
of days. We like snowmobiling so always hoping for more snow.

Signed Mixednuts
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Old 01-04-2006, 03:03 PM   #9
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When you rebuilt them did you turn the rotors and use new pads? Stop and go is really hard on brakes on large vehicles, they will glaze quickly. Watch the big trucks, they will just idle along in 2nd or 3rd, if cars pull in front of them so be it. You are too large to keep them out, no acceleration and can't stop like them; I usually get in with the trucks and ignore the cars, the truckers will tell each other which lane is blocked on the CB and get in the clear lanes.

New multi piston calipers will also need a new master cylinder, the displacement of the old one very likely won't be enough. The current mc runs off the hydroboost, so you are opening a can of worms on how to boost it.
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Old 01-05-2006, 01:13 PM   #10
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High brake pedal effort.....

Lack of boost from the hydroboost system. (Loose fan belt, low fluid, hydroboost system worn) Glazed pads. Too much heat causing brake fade. Incorrect brake friction material.

The issue with heat and the discs is so much heat is generated that you are experiencing brake fade. This would be true of multiple hard brakeing applications in a short period of time. The issue would be worse after the 3rd or 4th application.

Drilled or slotted discs will help with the cooling for this application. Or vents to direct more cool air to the rotors.

However I would be concerned with finding parts to fit. Multi piston calipers and drilled discs have to be hard or expensive to find for this lind of application. FOMOCO used 4 piston calipers in the late 60's. It was discovered after use and prolonged non-use one or more pistons may get stuck creating lack of or low braking. The switch was made to single piston set ups. Big truck may be a different story.

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Old 01-05-2006, 01:44 PM   #11
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Quote:
Originally Posted by Orland Dewey
Yes the 325 has disc brakes all four corners. They have all been rebuilt and repaired....
Orland:

Has the problem with the stopping distance been there since the rebuild?

I have a devil of a time bleeding the brake system on the 345 whenever I get "into" the brake fluid.

The last brake bleed required over 3 quarts of fluid sucked through the lines to get all of the bubbles out. I have invested in a "brake bleed pump" (about 35 bucks), and also a "remote infra-red thermo scanner" (a "point and shoot" thermometer).

To test the operation of all of your brakes you could find a remote area (a parking lot early on Sunday morning?) and do a number of hard brake stops. Feel (carefully) the discs (and tag drum) for heat build-up.

A "cooler" disc than the others COULD indicate a bubble in that line - on the other hand, a "hotter" disc than the others COULD ALSO indicate a bubble in the line - if the Master Cylinder is not allowing a full release of the pressure in the lines (acerbated by a "bubble" in the brake fluid). This situation manifested itself in my beast during the "Cloudland Canyon" ralley in '04.
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Old 01-05-2006, 07:26 PM   #12
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Steven, here's your bad Mojo....

Quote:
Originally Posted by swebster
"Oh, THAT'S how it's supposed to break!".
I think you meant, "oh, that's how it's supposed to BRAKE!" Please go out to your moho now and hug it, and say softly in it's ear....
"I really meant BRAKE, I really meant BRAKE."
Hope that helps on the next trip!
Marc (really just having a good time!)
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Old 01-05-2006, 08:32 PM   #13
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Ha! Freudian slip anyone?
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Old 01-06-2006, 05:46 PM   #14
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Re brake calipers

Hello Again I thank you all for the replys.

I have made contact with a company in Oregon and we are sending info
back and forth. When I get more info that is usefull I will be sure to pass
on anything I get in regards to multi-piston calipers. I tested my repair job
on gravel drive and started out from 0 MPH and went to about 12 MPH and
stomped hard and only one front brake draged in the gravel. I feel that
all 4 brakes should drag on a gravel drive. Perhaps I am expecting too much.
I know if they were airbrakes they all would be dragging.
They are all new calipers and the rotors are in very good shape. I feel
I just need more clamping force. Anyway thanks to you all.

Mixednuts ODD
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