Help Support Bigcoupe.com

Does this seem like a bad ABS Relay?

Post in this forum for topics relating to suspension, steering, and brakes

Moderators: ron, bfons, GRNSHRK

Post Reply
User avatar
clipper47
Bigcoupe supporter
Posts: 529
Joined: Mon Oct 10, 2011 12:22 am
Location: Ontario, Canada

Does this seem like a bad ABS Relay?

Post by clipper47 » Mon Oct 15, 2018 7:56 pm

I took my 1985 635CSi on an errand a few days ago. The ABS light came on shortly after driving off. At one stoplight I shut the ignition key to off and restarted the car and the light remained on. At the second stop I shut the ignition off and restarted the car and the light went out and remained out until I returned home after about 10 mile drive. I am thinking that one of the two relays is malfunctioning. Is this likely to be the case or is it symtomatic of another cause for the ABS to malfunction?
Dave
_____________
1985 635CSi US
Cosmos Blue/Pearl Beige

User avatar
jps635
Bigcoupe supporter
Posts: 632
Joined: Sat Feb 27, 2010 10:50 pm
Location: NZ

Re: Does this seem like a bad ABS Relay?

Post by jps635 » Tue Oct 16, 2018 6:28 am

i think one of the wheel sensors
'85 635csi JPS (RA2-66)

User avatar
clipper47
Bigcoupe supporter
Posts: 529
Joined: Mon Oct 10, 2011 12:22 am
Location: Ontario, Canada

Re: Does this seem like a bad ABS Relay?

Post by clipper47 » Tue Oct 16, 2018 11:20 pm

If a wheel sensor is faulty why would the light remain off for many miles and then shut off and not come on again when the ignition switch is cycled?
Dave
_____________
1985 635CSi US
Cosmos Blue/Pearl Beige

User avatar
jps635
Bigcoupe supporter
Posts: 632
Joined: Sat Feb 27, 2010 10:50 pm
Location: NZ

Re: Does this seem like a bad ABS Relay?

Post by jps635 » Wed Oct 17, 2018 7:13 am

No idea, but when one of mine crapped out he fault was at first intermittent.
'85 635csi JPS (RA2-66)

User avatar
86_6series
Bigcoupe supporter
Posts: 356
Joined: Mon Apr 02, 2007 10:08 pm
Location: West Nyack, NY

Re: Does this seem like a bad ABS Relay?

Post by 86_6series » Wed Oct 17, 2018 11:40 am

If the pulse generators are rusty, they will intermittently trigger the abs light.

User avatar
clipper47
Bigcoupe supporter
Posts: 529
Joined: Mon Oct 10, 2011 12:22 am
Location: Ontario, Canada

Re: Does this seem like a bad ABS Relay?

Post by clipper47 » Thu Oct 18, 2018 2:58 am

Thanks, I will clean the sensors and rings.
Dave
_____________
1985 635CSi US
Cosmos Blue/Pearl Beige

Pod
Bigcoupe supporter
Posts: 3867
Joined: Tue Mar 16, 2010 8:32 pm
Location: usually in the barn, Kent, England.

Re: Does this seem like a bad ABS Relay?

Post by Pod » Fri Oct 19, 2018 9:07 am

If one of the sensors or rings is dirty, they’ll often throw up a light when you reach a certain speed, in my memory something like 50-60 mph. Try and clean them all before you start throwing money at it.

User avatar
clipper47
Bigcoupe supporter
Posts: 529
Joined: Mon Oct 10, 2011 12:22 am
Location: Ontario, Canada

Re: Does this seem like a bad ABS Relay?

Post by clipper47 » Fri Oct 19, 2018 3:40 pm

Pod and others, Thanks for the advice. I will clean and test the sensors and brush any debris from the rings during my winter layover work.
Dave
_____________
1985 635CSi US
Cosmos Blue/Pearl Beige

User avatar
clipper47
Bigcoupe supporter
Posts: 529
Joined: Mon Oct 10, 2011 12:22 am
Location: Ontario, Canada

Re: Does this seem like a bad ABS Relay?

Post by clipper47 » Thu Oct 25, 2018 10:47 pm

Update on my ABS intermittent light issue. Thanks for all your good advice. I removed and cleaned the rear sensors and toothed rings and cleaned the front ones also although they were quite new. I think one of the rear sensors had collected a bit of iron dust. I blew out all the crud with an air gun and washed everything in brake cleaner and a brass brush. It was a good opportunity to careful remove the sensors and apply some never seize grease to them to help the future caretaker of this fine automobile. Bottom line is the light goes out and stays out ! Didn't cost anything other than time.
Dave
_____________
1985 635CSi US
Cosmos Blue/Pearl Beige

User avatar
hornhospital
Bigcoupe supporter
Posts: 2294
Joined: Sun Jul 11, 2010 6:46 pm
Location: Silverhill, AL
Contact:

Re: Does this seem like a bad ABS Relay?

Post by hornhospital » Fri Oct 26, 2018 2:32 am

=D>
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'87 325is "Odette"; '93 325is "Elvira"; '95 M3 "Ashlyn"

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests