Is there a Manual on the 190E ABS I have a problem that it not working
correctly in that the light comes on and then extinguishes but then
dependent on the weather may stay off but if gentle braking is applied
the pedal will kick back whilst stationary, this happens if the weather
is damp/wet But not always.  At other times it will come on an go off on
starting engine but will instantly come back on and stay the default
braking is very good but obviously as a vehicle with ABS not of the
correct order

I have Changed the ECU from an accident damaged car (Rear Damage) the
Over Volt relay, and fuse. both new front ABS sensors  but not the rear
as yet

This is my question is there a way that the correct working action of
the rear sensor can be checked (This part is expensive to buy and if I
take it to a MB dealer will instantly mean that it will be far greater
expense than the vehicle is worth as the dealer says they can only do it
by changing the parts one at a  time and can not diagnose the fault
before I get the chance to agree to repair, due to cost exceeding budget
and a £90 +VAT in labour this would not be to far into the diagnosis

The car has 180k miles on the clock, but the engine had a head overhaul
and new big end shells fitted and new Piston ring last year and drives
and looks good