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Diesel Pusher hydro-planing by Bob England
Post New Message I have a technical question about hydro-planing in a diesel pusher. A couple weeks ago my wife and I were traveling through western Illinois on I-70 east bound at around 11:00 a.m. The temperature was about 50 degrees F. The road was very wet and had been for several hours. Water was pooled on the roadway surface. We were keeping up with the trucks at about 70 mph with the cruise control and the exhaust brake on. Suddenly the coach seemed to side-slip to the right. I immediately disengaged the cruise control and the side-slip stopped. I was able to regain control immediately and continue unaffected. However, I did slow to about 62 mph. All was fine until we started down a slight downgrade and as the exhaust brake kicked in, I felt a momentary side-slip again. After disengaging the exhaust brake, the trip continued on normally, albeit at slower speed. I was towing a Jeep Grand Cherokee at the time.

Can you tell me if this is unusual or is this just a danger of driving on a highway with standing water while using either or both the cruise control and the exhaust brake? I believe that I've learned three things from this experience: (1) don't try to keep up with the trucks in all instances; (2) turn off the cruise and (3) turn off the exhaust brake in standing water road conditions.

My experience with diesel pushers is limited: 15,000 miles in a 1996 40 ft Brand X (GVWR 22,000 lbs) and this 2000 Brand Y (GVWR 32,500 lbs) - not all that much experience. However, I have never had this occurrence before and am concerned about this being a peculiarity of my coach. Brand Y technicians say this is certainly a near impossibility due to the weight of the coach on the tire footprints. The tires have good tread and the tire pressures were about 115 lbs all around at the time. The tires on this coach are low profile 175/70-22.5. Rear four are Toyo with 30,000 miles and the steer tires are Michelin with 4,500 miles.

I am not looking for a liability exposure problem with this model, but would like to know if there is anything else that I should be looking out for to prevent this from happening again.
All Messages in ThreadAuthorDate
Post New MessageDiesel Pusher hydro-planing Bob England 10-27-02  
  Reply to MessageRe: Diesel Pusher hydro-planing RV Wizard 10-28-02  
    Reply to MessageRe: Diesel Pusher hydro-planing Will S 11-19-02  
      Reply to MessageRe: Diesel Pusher hydro-planing Don 11-22-02  
        Reply to MessageRe: Diesel Pusher hydro-planing Alaskan 12-6-02  
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