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Old 01-31-2015, 10:32 AM   #1
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Location: Oklahoma
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air brakes w/auto slack adjusters and ABS Front

Does your motorhome have air brakes w/auto slack adjusters and ABS Front?

We are thinking of buying a 2013 Bounder 36R, FRED, Freightliner Chassis, that has air brakes w/auto slack adjusters and ABS Front brakes. It has a GVWR of 20,000 lbs and a GCWR of 26,000 lbs.

Therefore, if I understand this right, the coach, frame, motor, etc., can reach 20,000 lbs. That leaves me with 6,000 lbs for a two vehicle, people, luggage, food, water, etc., right?

I use to drive semi's with air brakes and they could lock up in a split second, it you needed them too. However, hydraulic breaks don't lock up.

I don't know if the 6.7l Cummings 240hp motor has a compression release, aka Jake Brake, or not.

Just wander if it has enough stopping power to go down some long declines in the Rockies. We are going to drive it from the midwest to Alaska and back this summer.

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Old 01-31-2015, 11:10 AM   #2
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Yes, we have self adjusting, anti-lock air and they work just fine (I tested). Here is the link to that engine http://cumminsengines.com/brochure-d...brochureid=339

GVW of 20k means everything all in, your max is 20k so GCWR is total weight of the coach plus the total weight of the towed vehicle.

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Old 01-31-2015, 11:46 AM   #3
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You are limited 20,000 lbs of weight on the rig axles. This includes passengers fuel water and baggage. You can tow up to 6,000 if you're hitch allows.

You will also have weight limits for each axle.
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Old 01-31-2015, 12:28 PM   #4
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The 2013 Bounder-36R FRED brochure lists the GVWR at 22K and GCWR at 26K, however the brochure indicates a 5000 lb hitch.

The weight you described (people, cargo, food, tools etc) is CCC Cargo Carrying Capacity, and is part of the GVWR allowance. It would also include tongue weight on the hitch, (negligible for a towed -but a factor if trailering)
If fully loaded at 22,000 lbs you only have a 4000 limit for your towed vehicle. If loaded at 20,000lbs, you would then be limited to 5000lbs towed weight, because of the hitch rating.
These numbers are from the brochure, your actual limits may vary and would be posted in the RV.
Definitions of GVWR GCWR etc are in the brochure.
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Old 01-31-2015, 06:19 PM   #5
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The Cummins 6.7 has either an exhaust brake or variable-vane turbocharger, no compression release/Jake brake. Yes, hydraulic brakes can lock-up if the ABS is not working. Our MH has ABS, auto slack-adjusters for the air brakes. All vehicles must have ABS after a certain year, our 1997 Jeep does, our 2000 MH does.
GVWR= gross weight limit of the coach. That includes people and pets, luggage, full fresh water tank, full fuel tank, foodstuffs, personal hygiene items, etc. The weight of what you want to tow is determined by GCWR - actual coach weight = maximum allowed weight of towed vehicle or 5,000# whichever is less.
When vehicle mfgrs. calculate weights, they use 153# for each persons weight- quite unrealistic these days.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 01-31-2015, 07:35 PM   #6
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Hi okie143,
Keep up with the chassis maintenance (including greasing the slack adjusters, if a maintenance item, zerk fittings) and you will be fine.

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abs, air brakes, brake, brakes

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