S70: - ABS Issues - help..

Roge1 · Apr 16th, 2020, 15:49

Afternoon all,

MY99 S70 2.0 10v

Recently had the front discs changed (pads were changed late last year) and am now experiencing an ABS pulsing effect when slowing from anything above 5mile/hour. Nothing seems to be amiss when I physically check the set-up, backing plates aren't fouling discs etc, and I've no warning lights on the dash. Strangely, when I checked the PFV website earlier, I couldn't seem to find reference to ABS sensors, which I had presumed might be the cause of the issue?

What should I be checking or looking out for??

Thanks in advance.

Roge1

volvo again · Apr 16th, 2020, 16:06

Do you mean you can feel pulsing through the brake pedal?

This sounds like warped discs, but if they're new it sounds like the mating surfaces haven't been cleaned properly allowing the disc(s) to run out of true.

Luxobarge · Apr 16th, 2020, 22:35

Classic symptoms of cracked or corroded reluctor rings on the front hubs. It won't put a fault light on as the ABS ECU simply thinks that the wheel is skidding, so does what it's supposed to do. Check them thoroughly and replace if at all suspect. It's also possible that an ABS sensor could give this fault, but statistically much less likely as a culprit.

Apr 16th, 2020, 15:49	#1
Roge1 Member Last Online: Oct 16th, 2023 15:32 Join Date: Aug 2007 Location: Aberdeen	ABS Issues - help.. Afternoon all, MY99 S70 2.0 10v Recently had the front discs changed (pads were changed late last year) and am now experiencing an ABS pulsing effect when slowing from anything above 5mile/hour. Nothing seems to be amiss when I physically check the set-up, backing plates aren't fouling discs etc, and I've no warning lights on the dash. Strangely, when I checked the PFV website earlier, I couldn't seem to find reference to ABS sensors, which I had presumed might be the cause of the issue? What should I be checking or looking out for?? Thanks in advance. Roge1

Apr 16th, 2020, 22:35	#3
Luxobarge Premier Member Last Online: Apr 26th, 2024 09:37 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Classic symptoms of cracked or corroded reluctor rings on the front hubs. It won't put a fault light on as the ABS ECU simply thinks that the wheel is skidding, so does what it's supposed to do. Check them thoroughly and replace if at all suspect. It's also possible that an ABS sensor could give this fault, but statistically much less likely as a culprit. __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Apr 16th, 2020, 16:06	#2
volvo again Master Member Last Online: Yesterday 14:56 Join Date: Jun 2018 Location: Presteigne, mid Wales	Do you mean you can feel pulsing through the brake pedal? This sounds like warped discs, but if they're new it sounds like the mating surfaces haven't been cleaned properly allowing the disc(s) to run out of true.

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