XC90 T8 Brake Problems

[Paulj1]

my 40 month old XC90 T8 has developed a brake problem.

The message comes up "AutoHold Service Required", and auto hold stops working, with also stops the adaptive cruise, then some times the message then become Brake Pedal Characteristics changes service required", then sometimes followed by "ABS not working"

Now it did it a couple of times dealer claimed not fault codes on car (?), and disks and pads changed on wednesday at dealer, then its gone nuts, doing it all the time now.

The you feel a shuddering abs type sensation from drivers side front, i assume the is a master cylinder somewhere that does the braking for the auto hold and radar cruise.... it is quiet disconcerting it brakes but feels very jerky.

Then you park the car up lock it.... resets everything and its fine again for 10 miles, and you brake for a junction, and it all goes tits up again....

Sounds like a sensor somewhere, wheel abs sensor ?

I have the extended Volvo warranty so its back at dealer on Wednesday, anyone seen this before ?

[Philip Fisher]

Originally Posted by Paulj1

my 40 month old XC90 T8 has developed a brake problem.

The message comes up "AutoHold Service Required", and auto hold stops working, with also stops the adaptive cruise, then some times the message then become Brake Pedal Characteristics changes service required", then sometimes followed by "ABS not working"

Now it did it a couple of times dealer claimed not fault codes on car (?), and disks and pads changed on wednesday at dealer, then its gone nuts, doing it all the time now.

The you feel a shuddering abs type sensation from drivers side front, i assume the is a master cylinder somewhere that does the braking for the auto hold and radar cruise.... it is quiet disconcerting it brakes but feels very jerky.

Then you park the car up lock it.... resets everything and its fine again for 10 miles, and you brake for a junction, and it all goes tits up again....

Sounds like a sensor somewhere, wheel abs sensor ?

I have the extended Volvo warranty so its back at dealer on Wednesday, anyone seen this before ?

Absolutely my money is on a wheel sensor. Possibly the wheels where you had the new disks and pads as you said that it has been worse since they dicked about with the pads and disks.....

[volvo for ever]

Obviously rear brakes did this only happen since brakes done???.

[volvo for ever]

Any updates ,I’m surprised you have warning messages on dashbut no codes logged??..

[Paulj1]

Its at dealer.... waiting parts, brake servo motor is being replaced, apparently there is a sensor in it that it is on the blink apparently.