Getting a Disabled Coach Into a Repair Bay

Air braked coaches use spring brakes for parking. A powerful spring inside the actuator applies the brake, and air pressure is what holds that spring compressed and the brake released. Lose the engine and the compressor stops. Lose air pressure over the following hours or days and the springs apply themselves. The coach is then parked whether you want it to be or not.

This surprises owners because it is the opposite of a car. A vehicle with hydraulic brakes and a dead battery still rolls. A coach with air brakes and no pressure has the parking brake mechanically applied at every axle it serves, and no amount of releasing the dash valve changes that. The wheels will not turn and dragging them destroys the shoes and the drums.

There are two ways forward and both belong to the transport operator rather than to the owner. The first is to supply air, either from the tow vehicle's system through a glad hand connection or from a portable supply, which releases the spring brakes normally and lets the coach roll. The second is to cage the springs mechanically, using the release bolt built into each spring brake actuator, which compresses the spring by hand and frees the wheel.

Caging is straightforward for somebody who does it regularly and hazardous for somebody who does not. The spring inside those actuators stores a great deal of energy and the housing is not something to open. What matters from the owner's side is telling the dispatcher that the coach is air braked and has been sitting without pressure, because that one sentence determines which truck and which operator gets sent.

• Air braked coaches park on spring brakes, applied by loss of pressure
• Supplying air from the tow vehicle releases them normally
• Caging bolts compress the spring mechanically as an alternative
• Neither operation is an owner task, and the housings are not to be opened

A coach with an automatic transmission generally must not be towed with its drive wheels on the ground. The transmission's internal lubrication depends on the input side turning, and a driveline spun from the output end for fifty miles runs dry. The manufacturer's documentation for the specific chassis is the authority here, and on most diesel pusher chassis the answer is either a driveline disconnect or all wheels off the ground.

That single fact decides the equipment. Drive wheels off the ground means a wrecker with a lift on the drive axle and the steer axle rolling, or a full deck. On a tag axle coach the tag has to be considered separately. This is why the dispatcher asks about chassis make and axle configuration before quoting anything, and why a caller who knows those two answers gets a useful number on the first call.

A heavy wrecker with a wheel lift handles a coach whose brakes have been released and whose driveline can be managed, and it is the more common choice for a unit that is otherwise intact. It is also the practical choice in a tight storage lot, because a wrecker can position where a lowboy cannot get turned around.

A lowboy or a heavy deck is the answer when the coach cannot roll at all, when there is impact damage that makes the suspension or steering unreliable, or when the drive axle is the damaged component. It needs room to load, a reasonably level surface and an approach that does not require reversing the length of a lot. Sorting the loading position before dispatch prevents the second invoice that a dry run generates.

We need length, height and whether it rolls. Length determines where it stages on the property. Height determines which door it goes through, and our bay doors are 16 feet, which clears a coach carrying rooftop equipment without drama. Whether it rolls determines whether we can move it once the transport leaves, which matters because a unit that cannot be repositioned occupies whatever square footage it lands on until the repair is finished.

Also tell us what is wrong beyond not starting. A coach with a fuel system problem, a coach with a locked engine and a coach with collision damage to the front structure are three different arrival plans. On the last of those we want to measure before anything is disturbed, which is easier if nobody has already jacked, chained or dragged the front end.

1. Overall length and overall height including rooftop equipment
2. Chassis make and axle configuration, including a tag if fitted
3. Whether air pressure is present and whether the wheels turn
4. Whether the air suspension has bled down onto its stops
5. Gate hours and the loading position at the origin
6. Any collision damage that should be measured before disturbance

Photograph the coach where it sits, all four corners plus any damage, before the truck arrives. Photograph it again loaded. Write the claim number on the transport ticket yourself if a claim is involved, and keep a photograph of both sides of that ticket. Those four steps take five minutes and they close off the most common documentation gap on transported units.

If the coach is being moved out of a storage facility, confirm gate hours and tell the lot manager a heavy truck is coming. A driver who arrives at a locked gate bills for the trip regardless, and a second dispatch for the same move is the invoice a claim reviewer will question hardest.