I'll look it up. The horse weighs 360 to 450 kg, the quarter in this context is an American coin with diameter 24.26 mm .. I think it's pretty clear now.
Somewhere between 7.6 and 9.5 MPa (1100-1400 freedom pressures) if I've done my maths right
Maybe it's a function of my work, but that sounds like a lot of Pa.
Cross checking with units : A coin of diameter 25.4mm=0.0254m has an area of pi(0.0254m/2)^2=0.00016129m^2, and 9.81N/kg450kg/4=1103N, so that gives 1103N/(0.00016m^2)=6.819MPa. Sounds right, pascals are quite small. :)
Without us comfortable cars with good suspension wouldn’t exist. Be thankful.
... I had the 'pleasure' of driving American cars and if there's one thing they don't have it's good suspension. Though maybe they finally stopped using leaf springs for newer models.