Suspension

Scania N113CRB luver SG

Hello guys . I just wanted to ask , how does the Mercedes Benz O405's suspension work ? Everytime when the bus began picking up alot of passengers , i will hear a hissing sound coming from the suspension itself .

Then when the bus is empty , there's also a hissing sound from it . Its like almost instantaneously , unlike the B9TL's suspension , which springs back up to adjust itself , also known as electronic controlled suspension . B9TL's suspension adjusting itself can be felt , but the O405's suspension can be quite hard to notice adjusting itself .

But how does the mercedes Benz O405 suspension work ? Anyone can enlighten me? Smile

tintinspartan SG

I dun know myself but I think it's known as 'kneeling down' the bus. Some B7RLEs in Sentosa have the feature of kneeling down. It's to help passengers to climb aboard the bus, I think. Confused Wink

Scania N113CRB luver SG

Mercedes Benz O405 got kneeling function ? Confused

tintinspartan SG

Like I said, it's just a guess. I once saw a Volvo B7RLE letting off air when at rest and the bus tilted to the pavement a bit. The B9TLs and B10BLEs may have had this function, but most BCs didn't realise it. Wink

Scania SG

O.405s do not have kneeling functions by default. That is just the air suspension sound.

tintinspartan SG

Could be anti-roll suspension. Wink Mainly installed in post-1994 buses. This would prevent the bus from tilting. LRTs also featured this function. Wink

Scania N113CRB luver SG

No wonder everytime the O.405 turns hard , there is this hissing sound . Infact im quite addicted to the sound . Sounds unique to me . Embarassed

Windy_hates_B10TLs SG

They have airbag suspension, like all modern citybuses from about the 90s. It is a rubber oval shaped, tubular object which sita between two metal plates, and the shock absorbers. What the hissing sound would be is just air escaping the air-bag, especially caused by the weight of people stepping on and off the bus. You will find on buses there are 3 air reservoirs. front and rear for the brakes, and an auxiliary reservoir for the doors, suspension, maxi-brake (hand brake), and other uses.