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01-15-2012, 12:26 PM
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#1
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Senior Member
Join Date: Nov 2011
Posts: 204
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Brake Problems
ABS brakes; We have a 99 Alpine Coach with 4 wheel Bosch hydrakic disc brakes, coupled to a Merritor/Wabco ABS. We have lost our brakes twice. Master cylinder full and yet the pedal would go clear to the floor with no resistance,and will not pump up. We have been told that it has a faulty sensor on one wheel, ok, if that being said, why do we have complete brake failure on the entire system???? A mechanic has unplugged the system and we are traveling without the benifit of the ABS. We all drove many many years without ABS. The last time the monster healed itself in a rest area, nothing was done, and the brakes restored themself as quick as they failed. Any thoughts?? old trucker
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01-15-2012, 12:50 PM
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#2
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Senior Member
Fleetwood Owners Club Carolina Campers
Join Date: Feb 2007
Location: Battle Creek, MI
Posts: 147
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Old Trucker
My guess is that there is water in the brake fluid. When the fluid heats up which it does with use the water turns to steam which won't compress. Then the pedal will go to the floor. When it cools off the steam turns back to water and the pedal will return to its normal position. Flushing and changing the brake fluid is highly recommended every two or three years.
lyledavid
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01-15-2012, 02:50 PM
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#3
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Moderator Emeritus
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
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I have moved these posts from the New Member Check In forum to get more knowledgeable views and to avoid hijacking someone else's thread.
Rick
__________________
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD
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01-15-2012, 03:55 PM
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#4
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Senior Member
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,467
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The pedal going to the floor has nothing to do with the ABS. If you had a wheel sensor go the ABS warning light would be on and you did not mention this. My ABS ECU failed years ago and it was too expensive to replace so I have been braking without the benefit of ABS for some while and never noticed the difference. I have changed out my master cylinder and all 4 calipers and given the age of your coach you may need to do that. What you describe sounds like overheated brake fluid, which may be contaminated with water if it hasn't been flushed recently. I think you need to find another brake shop to go to.
__________________
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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01-15-2012, 04:02 PM
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#5
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Algoma
The pedal going to the floor has nothing to do with the ABS. If you had a wheel sensor go the ABS warning light would be on and you did not mention this. My ABS ECU failed years ago and it was too expensive to replace so I have been braking without the benefit of ABS for some while and never noticed the difference. I have changed out my master cylinder and all 4 calipers and given the age of your coach you may need to do that. What you describe sounds like overheated brake fluid, which may be contaminated with water if it hasn't been flushed recently. I think you need to find another brake shop to go to.
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Agreed
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-15-2012, 04:37 PM
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#6
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Senior Member
Fleetwood Owners Club Carolina Campers
Join Date: Feb 2007
Location: Battle Creek, MI
Posts: 147
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RickO
Thanks for moving the posts. As soon as I sent a reply to old truckers question I realized I was in the wrong place for the reply. I didn't mean to step on Rocky Haynes post.
Lyledavid
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01-15-2012, 06:08 PM
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#7
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Senior Member
Alpine Owners Club
Join Date: Jun 2003
Location: Ontario, CA USA
Posts: 1,402
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Many years ago when I turned wrenches for a living the rule of thumb with brakes was if the brake pedel goes to the floor on a dual master cylinder (Which Alpine Has) and no fluid leaks are found it is probably a bad Master Cylinder. Dual Master Cylinder can bypass brake fluid internally and not allow pressure to build, which will allow the brake pedal to go to the floor.
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01-24-2012, 11:09 AM
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#8
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Senior Member
Join Date: Oct 2004
Location: wandering North America
Posts: 484
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We had a problem with the brakes overheating which was caused by the brake pedal not returning all the way after removing foot pressure. The pivot that redirects the pedal force to the master cylinder was rusted and stiff.
If you can pull the brake pedal up with your foot (or hand if you're parked) then check the pivot.
John
__________________
36ft 2006 Alpine Coach FDDS
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01-27-2012, 11:49 AM
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#9
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Member
Alpine Owners Club
Join Date: Oct 2006
Location: West Monroe, LA
Posts: 60
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Ours is a 98 Alpine and we have had this problem twice...as long as I keep the front brake calipers oiled with WD-40, we have not had any more trouble. We move locations almost every week. So just before we leave a location I give them a little spray. When I wash the coach I pressure spray the caliber slides to remove dust and road grime, then oil. Working great. Wish I would have learned this before the $2400. brake job three years ago...
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Brian & Vicki
"Sharing th Gospel of Jesus Christ through ventriloquism and puppetry."
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01-27-2012, 02:18 PM
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#10
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Senior Member
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,467
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Brian, I don't think what you are doing is advisable. You cannot lubricate the pistons this way and and you risk getting oil on the rotor and the brake pads. The rail slides on the caliper should be lubricated with a special grease that will not wash off and if it gets a little dirty it doesn't matter.
http://www.permatex.com/products/Aut..._Lubricant.htm
__________________
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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01-27-2012, 06:54 PM
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#11
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Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,385
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Brian- I agree w/John, using WD-40 isn't the right approach. You need to grease the slides w/
The WD-40 is better than nothing, but long term probably not good for other components. Using this 3M stuff should cut way down on your # of trips under the coach.
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Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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01-30-2012, 09:42 AM
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#12
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Member
Alpine Owners Club
Join Date: Oct 2006
Location: West Monroe, LA
Posts: 60
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Tks for the info...I will make the change you have recommended today!!! I appreciate the advice...
__________________
Brian & Vicki
"Sharing th Gospel of Jesus Christ through ventriloquism and puppetry."
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