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Old 08-24-2005, 12:57 PM   #1
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I have a 1994 Flair Class A and my brakes were fine as we were going down a mountain switchback on a hot day a few weeks ago. I used compression during the desent of about 1200 feet in about 30 minutes and there were tow logging trucks in front of us, which caused me to go slower then normal. When we got to the main highway we pulled off to have lunch. About 30 minutes later when I started to leave the brakes went to the floor. We had the motorhome towed to a Chevrolet dealer. The dealer said that they checked the linings, fluid and everything and couldn't find any thing wrong with them. This has never happened before and now I am leary of mountain grades. Somesaid the fluid may have boiled. Anybody else have this experience?
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Old 08-24-2005, 12:57 PM   #2
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I have a 1994 Flair Class A and my brakes were fine as we were going down a mountain switchback on a hot day a few weeks ago. I used compression during the desent of about 1200 feet in about 30 minutes and there were tow logging trucks in front of us, which caused me to go slower then normal. When we got to the main highway we pulled off to have lunch. About 30 minutes later when I started to leave the brakes went to the floor. We had the motorhome towed to a Chevrolet dealer. The dealer said that they checked the linings, fluid and everything and couldn't find any thing wrong with them. This has never happened before and now I am leary of mountain grades. Somesaid the fluid may have boiled. Anybody else have this experience?
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Old 08-24-2005, 01:08 PM   #3
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Some said the fluid may have boiled. Anybody else have this experience? </div></BLOCKQUOTE>

RV Man & Woman,

Welcome to iRV2, we're really glad to have you here as a new member and are looking forward to reading your posts about your RVing experiences and adventures. You'll find a great bunch of folks on this site who are very knowledgeable of RVing, the rigs we use, and the places we go in them.

As you'll see, they're eager to help and share their knowledge and experiences with others.

I had a similar experience on a pickup truck a few years ago. When I'd crest the top of a long, steep grade the brakes would go to the floor as I started the descent, Scary!!

Long story short, it turned out to be the exhaust's tail pipe was too close to a brake line above the rear axle. I had just had new pipes installed shortly before the problem appeared. The fluid apparently was boiling at that spot and causing a loss of hydraulic pressure. It was an easy fix, moved the brake line a few inches and never had the problem again.

Take a good look at all your brake lines to see if they're up close to anything hot such as the manifold, tail pipe, etc. Good luck and stay safe!

Again, welcome to iRV2, we're glad you joined.
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Old 08-24-2005, 02:19 PM   #4
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Welcome to IRV2.

The boiling fluid idea makes sense. Mechanically nothing wood have changed while you ate your lunch but the heat buildup could easily have boiled the fluid. Once that happens, you won't have a steady stream of non-compressible fluid to operate the brakes.

It's important to know that brake fluid doesn't "boil", It's the moisture inside it that boils and the steam compresses when the pedal is pushed and the pedal goes to the floor without actuating the brakes. Moisture gets into a brake system over time so now that you've had this issue I'd have the system flushed and replace the brake fluid with new fluid. Personally, on an RV I would do this every 2 years but some recommend going up to 5 years before changeing.
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Old 08-24-2005, 04:50 PM   #5
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RV Man&Woman..Welcome to iRV2. Glad to have you with us. As you can see, You are on the best RV site on the web, with the most informed members you'll ever meet.
We look forward to hearing from you often....Brad
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Old 08-24-2005, 05:42 PM   #6
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I'll second Cruzer, happened to me on my old MH. Pulled into a gas station & filled up, (gas was $1.25 a gal back then) Went to pull out & pedal went to the floor, couple of minutes later it was fine. That's when I found out on one of these forums that brake fluid has to be changed on MHs that aren't used everyday.
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Old 08-25-2005, 12:27 AM   #7
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I too agree that the fluid should be changed. What I don't understand is that the dealership didn't realize the same thing. Anyway, you now know what to do. Welcome to iRV2, we look forward to you being an active participant on this forum.
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Old 08-25-2005, 08:32 PM   #8
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Hello & Welcome RV Man & Woman:

For my $0.02 about your brakes, when I was a mechanic many years ago and was at a licensed brake inspection station in California, if the brake peddle went to the floor and no other leaks or problems were found it was the master cylinder that was going bad. All vehicles since 1967 have had dual master cylinders so if you lost the front or rear the other would still bring you to a stop. If they both failed the only place they come together is the master cylinder. Master cylinders at times act funny when they are going bad, they will work fine and then go to the floor, and the next time you use them they are fine again.

I hope this information helps.

Safe travels.

Dave
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Old 09-05-2005, 07:50 AM   #9
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I'll put in my $0.01 with Dave and make it $0.03. If you were stopped for 30 minutes I would think the brake fluid would have cooled enough for there to be no steam present in the system. I too would check the master cylinder.

I am going to flush my brake fulid however. Thanks guys for the reminder!
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