|
|
|
|
|
#1
11-19-2008, 06:59 PM
|
||||
|
||||
|
Sudden ABS Rear Brake Application
Hi all
1987 420SEL. All of a sudden, the rear brakes applied themselves. No ABS light lit, and only the rears applied. Shut car off, restarted, problem has not reoccured. But now, every once in a while, the ABS faintly actuates on a slow stop. What would cause the rears to lock up? How to diagnose? I am guessing the fronts are simply dirty senors or sendor wheel.
__________________
Thank You! Fred 2009 ML350 2004 SL600 2004 SL500 1996 SL600 2002 SLK32 2005 CLK320 cabrio 2003 ML350 1997 C280 Sport 
|
|
#2
11-20-2008, 01:54 AM
|
||||
|
||||
|
Quote:
I have never had the "locking" brakes, but occasionally I will get the exact same ABS activation when slowing to a stop in my 1988 300SEL (which is the same as your car, only different engine). Its like they are "checking" themselves or something like they do when you first hit 5 mph after you first start out- which that part, I think is normal.  My old 1985 380SE had the optional ABS brakes and did the same thing, only on that car, the "anti-lock" light would occasionally illuminate when it did this, whereas it does not on my current car.
__________________
2004 Toyota Sequoia Limited 4wd 1991 Lincoln Town Car Executive 1991 Cadillac Sedan DeVille 1988 Mercedes 300SEL 1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon 1973 Pontiac Grand Ville (Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)
|
|
#3
11-20-2008, 12:54 PM
|
||||
|
||||
|
It is probably the 'brain' going soft in the head. I had the same issue in the SDL. The antilock would kick in at every stop OR the light would come on and you would have no antilock function. You can try cleaning the sensors on the wheel hubs (front) like I did, but that did not help. I just went to the bone yard and picked up a "new" brain from a 560 SEL for $50.00 that is working correctly. They just plug in and you are good to go.
FYI a new computer costs over $2000.00 
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
|
|
#6
11-20-2008, 08:34 PM
|
||||
|
||||
|
^^ The tires are identical.
I'm going to swap out the ABS computer with one from one of the 16vs to see if that changes anything this weekend.
__________________
Thank You! Fred 2009 ML350 2004 SL600 2004 SL500 1996 SL600 2002 SLK32 2005 CLK320 cabrio 2003 ML350 1997 C280 Sport
|
|
#7
11-20-2008, 08:39 PM
|
|||
|
|||
|
It may not be even the abs module.....
It could be circuitry or caused by any modifications you made to the car.
__________________
1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
|
|
#9
11-20-2008, 09:46 PM
|
||||
|
||||
|
I've probably got a box you can try, what is the number on the box in your car?
__________________
 Gone to the dark side - Jeff
|
|
#10
11-21-2008, 05:33 PM
|
||||
|
||||
|
bump
Part number on the control unit? I might have a "loaner".
__________________
Gone to the dark side - Jeff
|
|
#11
11-21-2008, 07:15 PM
|
||||
|
||||
|
Hi Baby
Thanks for the offer. I need to run over to the garage to see what numbers are on my 16vs' units before I bother you with this. again - THANKS!
__________________
Thank You! Fred 2009 ML350 2004 SL600 2004 SL500 1996 SL600 2002 SLK32 2005 CLK320 cabrio 2003 ML350 1997 C280 Sport
|
 |
| Bookmarks |
|
|
Linear Mode
