Busses use Air springs for the suspension in place of leaf springs and on some drivers seats.
The suspension air springs also allow the bus to “kneel” when air is exhausted from the system.
Most bus airsprings are called bellows (also known as Rolling Lobe)
Bus bellows usually are not sold with a metal base or top section (these are obtainable from the bus part supplier) i.e. they consist of a rubber section only.
We stock around 27 different sizes of bus bellow and around 8 different air seat springs.
The maximum diameter of a bus bellow ranges from 186mm to 315mm
The maximum installed height of a bus bellow ranges from 320mm to 530mm
The internal diameters of the top and bottom hole (Most reliable check when measuring a bus bellow) can sometimes be different (around 5 tapered bellows) although some tapered bellows have the same top/bottom diameters.
We suggest that you have the part welded (many bases are Aluminuim) and then ground and polished to restore the original shape.
If a part number is supplied, we can often calculate a nearest correct match to supply a part where the original is not imported to South Africa (some older busses).
This may require that the bus bellows on both sides of the axle are replaced instead of just the damaged bellow.
We also look for the most cost effective option, so future replacements may then be cheaper.
We stock a number of levelling valves and regulators. See the Truck/Trailer section of this site.
We sell SACHS shocks for European makes, i.e. Metric Shocks and only stock shocks where the price is far more cost effective than the OEM shock, while the quality is equal or better.
AMC, DAF, Dennis, Fiat, G.M.C., Hino, Ikarus, Iveco, Leyland, Magirus Deutz, MAN, Mercedes Benz, Neoplan, Renault RVI, Scania and Volvo busses
Dunlop, Firestone, Goodyear, Blacktech, Airtech, Contitech, Pirelli (CF-Gomma), Taurus
It becomes shorter and fatter, often to the point where the new replacement part looks wrong when compared to the old part.