question about abs.
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Postmaster
Joined: Oct 2004
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From: Southern Louisiana
question about abs.
had a lot of time on my hands last night and for no particular reason at all i got to thinking about when i changed my rotors a few months ago. when i went to buy the replacements i was asked whether or not my truck had abs. i asked what the diffrence was and the salesperson told me that trucks with abs have a little stator ring on the inside of the rotor and the ones without abs dont have it. i assumed that my truck had abs cause when i turn the key and it does its system check, an abs as well as a brake light checks. when i got home however, and took the old rotors off, i saw that they didnt have the stator ring on them, so i had to return the ones i just bought and waited the 2 days to get the right ones. so my question is this=>if my truck dosent have abs, how come does it check the system at startup? do i only have abs in the rear? i am not sure of how to check if i have abs on rear brakes? and lastly, why would the factory only put abs on the rear if it is supposed to prevent the brakes locking up and in turn help the driver maintain control of the steering? just dosent add up to me. not all that important, just something i was wondering about.
Lead Driver
Joined: Jul 2003
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From: Wheatland, Mo
There is a sensor on the rear differential that is for the ABS. So you may not have a stator ring unless that is where is it getting it info from. 96 and older I beleive had the stator ring, (could be wrong on the year), then it was changed to the rear diff. As for the front, I haven't taken mine apart yet but I am sure someone here can answer for the fronts.
Elder User
Joined: Jun 2004
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From: Chesterfield, Mi
I used to have a great article that showed the paths of vehicles with out antilock brakes, with rear anti lock brakes and with 4 wheel abs. If I remember correctly, the vehicle without abs did 360's in a panic stop on slippery pavement. The rear abs vehicle stopped better but you can't control the steering, and the 4 wheel abs stopped good and allowed steering. This link tells how they work http://auto.howstuffworks.com/anti-lock-brake3.htm
Senior User
Joined: Feb 2005
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From: Southwestern Pa.
Empty pickups tend to lock the rear brakes. Couple that with ford's problem with friction material absorbing water and making the rears "grabby" on the older models. I've never heard or seen of front wheel only abs.
My 98 has RABS. Pretty sure your truck has the rear sensor at the diff. Probably no 4 wheel abs on your 97 if your rotors don't have the ring or sensors at the front wheels.
An easy way to check is to follow the brake lines from the mastercylinder. They go into the abs unit, Either for rears only or both for the fronts.
My 98 has RABS. Pretty sure your truck has the rear sensor at the diff. Probably no 4 wheel abs on your 97 if your rotors don't have the ring or sensors at the front wheels.
An easy way to check is to follow the brake lines from the mastercylinder. They go into the abs unit, Either for rears only or both for the fronts.
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Postmaster
Joined: Oct 2004
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From: Southern Louisiana
i am thinking about it a little more and am still trying to figure out the logic in just rear abs. with an abs system you are supposed to keep your foot on the pedal with steady pressure and let the abs do the work and w/o abs you have to pump. so if you have rabs, do you pump to keep control of the front end(the most important end if you ask me) or just keep you foot in the floor to prevent fishtailing? if you still have to pump, than what is the point of rabs?
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Postmaster
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From: Southern Louisiana
oh, okay guys, i just figured it out. i looked in my truck at the floor and there are 3 pedals and i caught the answer to my previous questions immediatly. one pedal is the accelarator, one is front brakes, and the other one is for my back brakes. so in an emergency braking situation, i have to pump the pedal for the front brakes and hold the pedal for the rear brakes so the rabs can function properly.
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Posting Guru
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From: Chicago Area
BigDaddy, I guess you're not serious, but if you are, I must tell you that the third pedal is the emergency brake which is operated mechanically (rather than hydraulically), so that no anti-lock can occur when you press it.
Rear ABS was an inexpensive improvement over conventional brakes that was especially good for unloaded pickups. You must still pump the brakes to provide quickest stops and retain steering control.
Rear ABS was an inexpensive improvement over conventional brakes that was especially good for unloaded pickups. You must still pump the brakes to provide quickest stops and retain steering control.
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Postmaster
Joined: Oct 2004
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From: Southern Louisiana
MrBSS, i was just teasing. the third pedal i was referring to was my clutch pedal. the thing that scares me about that is for you to mention it, you must know a few people that dingy, and people like this are still allowed to drive. (people like my wife)
Posting Guru
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Yes...Sorry for the implication. I'm an engineer and somewhat challenged in the area of humor. But I am often surprised that seemingly intelligent and educated people don't have a clue as to what happens under the hood.
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From: Southwestern Pa.
Warning! Another story!
When hand held GPS units first came out they were somewhat lacking and very misunderstood. Walking out of the woods after a not so productive day of hunting, My young son and I listened while 2 old friends discussed the merits of the GPS as opposed to a compass. The first comparison was accuracy as to the direction we were heading. Ken commented that the GPS worked best while in motion. Keith immediately commented"Let me get this straight. In order to find north you have to throw that thing as far as you can?"
LMFAO.
And now for the rest of the story. My young son later asked me if you really had to throw it.
Lot of Noob's looking for guidance. Young , inexperienced, or dingy, it is best to clarify for safeties sake.
If anyone is still with me the old pickups would lock the rears with very little brake pressure or warning. A wet road and the rear would lock and fishtail while the fronts brakes were not even close to locking up. Thus RABS.
When hand held GPS units first came out they were somewhat lacking and very misunderstood. Walking out of the woods after a not so productive day of hunting, My young son and I listened while 2 old friends discussed the merits of the GPS as opposed to a compass. The first comparison was accuracy as to the direction we were heading. Ken commented that the GPS worked best while in motion. Keith immediately commented"Let me get this straight. In order to find north you have to throw that thing as far as you can?"
LMFAO.
And now for the rest of the story. My young son later asked me if you really had to throw it.
Lot of Noob's looking for guidance. Young , inexperienced, or dingy, it is best to clarify for safeties sake.
If anyone is still with me the old pickups would lock the rears with very little brake pressure or warning. A wet road and the rear would lock and fishtail while the fronts brakes were not even close to locking up. Thus RABS.