ABS issues - any ideas? (1 Viewer)

Toyo Boyo

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Joined
Aug 10, 2008
Messages
440
Location
South Wales, UK
Hi guys,

Searched but not found much............

When stopping, it sometimes it feels like the ABS activates. This is on dry, decent pavement and happens just as the truck comes to a halt, at low speed. Definately no skidding taking place.

Hasn't happened often, nor for a couple of weeks. Now the ABS light comes on after the truck has travelled a few hundred yards.

All brake pads were changed about 3 months ago and these problems weren't happening then. Brakes feel fine too. Brake fluid completely bled thorugh about 6 months ago and level is fine.

Any ideas?

Sensors behind the calipers? Maybe something to do with the CDL (fitted over a year ago).

Any help greatly appreciated

:cheers:
 
Joined
Oct 3, 2006
Messages
8,112
Location
Medford, OR
Pull the sensors (one bolt) and check them for metal shaving fouling.

You also may need to adjust your LSPV. If it is misadjusted, it can cause the ABS to kick in. I nearly rear ended someone when exactly that happened to me.
 

Toyo Boyo

SILVER Star
Joined
Aug 10, 2008
Messages
440
Location
South Wales, UK
I was thinking sensors - I'll strip them down on the weekend and check it out.

LSPV was adjusted when I fitted the OME suspension about 18 months ago - not really noticed any issues at that end, but I'll check that out too.

Cheers
 
Joined
Aug 3, 2009
Messages
482
Location
Lander, WY
x2 on cleaning the sensors, after some front axle service my ABS immediately began activating at every stop. The sensors needed cleaning. No problems since.
 
Joined
May 21, 2008
Messages
98
When I had this problem I found I had smashed the ABS sensor wire that runs along the left control arm - found that when I replaced the two sensors and harness (comes as a matched set, I paid about $200 if I recall). I have heard of cracked ABS sensors (plastic kind, my original were aluminum). If the ABS sensors are not removed when the burfields come out, they can be damaged.

Fouling is the most likely problem. And then the question is, where is that metal fouling coming from?

1993 LC here.
 

iptman

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Joined
Nov 22, 2008
Messages
4,714
Location
Northern VA
I had this happen after my front axle service. In my case the bolt holding the sensor in wasn't tight enough, like it wasn't grounding the circuit properly. Snugged it down another half turn and all was well.
 

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