IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

'99 S70 FWD, Base, Auto -- Front end vibration on braking

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

User avatar
E Showell
Posts: 3021
Joined: Thu Oct 16, 2008 4:00 pm
Year and Model: V70R '06 AWD Auto
Location: Long Valley, N.J.
Has thanked: 13 times
Been thanked: 58 times
United States of America
E Showell

'99 S70 FWD, Base, Auto -- Front end vibration on braking

Post by E Showell » Sat Jul 29, 2017 1:33 pm

So I'm getting an intermittent front end judder when braking from moderate speeds -- say 50 plus. And I'm not talking panic stops here. Even with nice smooth application of the brakes, I'm getting the steering wheel vibrating back and forth. Alignment is good. Tire pressure and wear good. Wheel balance believed to be good. Local independent said brakes looked "fine." Not getting any ABS light but I am wonder whether at c. 139K miles my ABS brain could be going. I did have an instance recently at a stop light where I was slowing down for a car stopped in front of me and it felt like the brakes momentarily gave out before grabbing immediately -- just the ever so slight hiccup. That's what has me thinking it could be the ABS brain. None of the other usual symptoms with funky tachometer/speedometer readouts and that kind of thing, though and no ABS light. Also, I don't know that I've ever been conscious of this car doing that low speed ABS self-test.

Maybe Matty Moo will wander by?

Any thoughts?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)

kahl
Posts: 943
Joined: Sat Oct 27, 2012 7:01 pm
Year and Model: 2000V70XC
Location: columbus ohio
Has thanked: 0
Been thanked: 7 times
United States of America
kahl

Re: '99 S70 FWD, Base, Auto -- Front end vibration on braking

Post by kahl » Sat Jul 29, 2017 6:16 pm

To me it sounds like warped rotors. I have run into this issue many times. It doesn't take much warpage to feel the pulsating. Most shops and NAPAs have a disc turning machine to get them back to specks. I took a set into my NAPA and had them turned for $20.00 each. There is a minimum thickness regarding how much material can be removed.

User avatar
abscate
MVS Moderator
Posts: 20561
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 290 times
Been thanked: 908 times
Trinidad & Tobago
abscate

Re: '99 S70 FWD, Base, Auto -- Front end vibration on braking

Post by abscate » Sun Jul 30, 2017 4:23 am

The ABs modules fail safe. You could just unplug the power for the pump motor, and see if that stops the shudder. I'll guarantee it won't.

:-)

I think I remember you have a good scanner and can clear ABS faults, as disconnecting this will cause a light.

The self test is a light " chirp" sound at about 15 mph on mine. I theorize it has to happen at speed so that the wheels are spinning fast enough to give the ABS module a clean signal from the reluctors or toothed wheel on each wheel. It tests all four sensors
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

Post Reply
  • Similar Topics
    Replies
    Views
    Last post