05) General information
05.1) Guess the weight
05.2) Worn rollers
05.3) Above ground
05.4) Reverse direction
05.5) Results report print out
5.1) Guess the weight
The 3.2 TD Pajero as featured in some of the pictures has a total weight of 2219 Kg's and a rear axle weight of 1115 Kg un-laden.
Often when travelling I get the total weight guessed as being 1800 kg's and rear axle weight being 800 kg's even when all my brake tester installation equipment is laden.
The rear axle weight is than around 1450 Kg's. Let's do some figures!
Friction coefficient 0.85
1) An axle weight guessed at 800 kg's should return a brake force of 3.4 KN per wheel
2) The actual axle weight un-laden 1115 Kg's returns brake force of 4.74 KN per wheel
3) The actual axle weight laden of 1450 kg's returns a brake force of 6.16 KN
The relation between the guessed weight and the laden brake force would give a manually calculated efficiency of:
The 6.16 KN actual brake force divided by 800 kg's / 2 = 4KN (wheel weight) equals an axle efficiency of 154 % and that's impossible!
100% brake efficiency is only possible when the rollers and wheels are geared together, the actual rear axle efficiency was around 85%
From the above it should be clear that the weight on the axle is critical in determining the brake efficiency.
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