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you have odd size tyres, the profile size is different, the rolling circumferance will be different (the distance traveled in one complete revolution of the wheel) the bigger the tyre the greater the circumferance, the abs system mesures the speed of each wheel and just before the wheel locks up or a big difference in speeds of the wheels under braking if will release the pressure in the brake pipe on the wheel that is going slowest, then allows the preasure to go back to that wheel (on off effect) it does this many times a second, this is why the brake pedal pulses under your foot when braking
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But if they were as originally fitted,the control unit would have been programmed to cope with the different rolling radii(rolling radii is distance from centre of wheel to ground with vehicle loaded)-multiply this by 2 pi and you get rolling circumference.
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Front tyres are 235/40/18 Back tyres are 265/35/18
5 mm diameter difference between the front and rear tyres isn't enough to upset the ABS system. New tyres have 7 to 8 mm of tread, and the legal wear limit is 1.6 mm. You do the math.
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