kgkern01

iTrader: (10)

I have an ABS Inop light that only comes on after starting the car and once the car moves forward a few feet. Then it of course stays on the whole time I am driving. I have replaced the rear ABS sensor, to no avail. Any other suggestions?

metalmilitia606

iTrader: (8)

On my old lt1 camaro this used to happen a lot. Turns out the ABS module or whatever it's called was bad.

TurbopigB4C

iTrader: (5)

What code is set?

kgkern01

iTrader: (10)

I can get one cheap at the local junkyard, I'll probably try that first, if not, then I assume front wheel sensor?

What is the resistance supposed to be at the sensor for the front wheel sensors?

kgkern01

iTrader: (10)

I don't have a Tech2, to check the ABS.

TurbopigB4C

iTrader: (5)

The worst thing you can ever do is start guessing without even knowing the code. Some cars can even throw abs lights from a burnt out brake bulb so just replacing modules and sensors wont do any good until you get the code. I would not buy a junkyard abs module because the gm modules are prone to failure. You can pull the cluster apart and take the bulb for the abs light out if its the light that bothers you.

rabbit320

iTrader: (11)

check fuses as well...

1995blacktattop

iTrader: (2)

could be as simple as your pads/rotors needing replaced. i know when my car had abs inop issues several years ago, changing the rotors and pads fixed it.

wssix99

iTrader: (5)

Unless you get a hold of a scanner, you'll spend thousands looking for the issue by trial and error.

kgkern01

iTrader: (10)

I'll rebleed everything and check everything out again.

I did forget to mention the problem that it is doing under braking as well. The pedal travels far on the first push when driving, sometimes causing the BRAKE light to come on, then on the 2nd push it stiffens up and the light will come off, usually I can feel (not hear) what I would describe as a click in the pedal when the brake light goes off on the 2nd push. Does this help to narrow down what to check?

1995blacktattop

iTrader: (2)

that does kind of sound similar to what mine would do. i never saw the BRAKE light though.

under slow braking my pedal would get really hard and the LOW TRAC light would come on, after doing this 2-3 times the brake pedal would almost go to the floor and then pop back up and then the ABS INOP would come on and stay on. it was like my car was thinking it needed to activate the ABS for a dry pavement slow speed stop.

kgkern01

iTrader: (10)

So did you solve your issue?

1995blacktattop

iTrader: (2)

yeah, i thought i mentioned that in the first post i made. it was solved by new rotors and pads.

kgkern01

iTrader: (10)

I have new rotors and pads on the front, didn't change anything. I'll check out the back calipers.

1995blacktattop

iTrader: (2)

my problem was with the front. i remember having a blowout that "fixed" the problem for a month or so. when i went to have the car serviced at 100k i asked them to check the abs sensors and they said the sensors looked ok but that my front pads had ~ 20% life left.

i doubt it's your rear channel causing the problem but i suppose it could be. i do know in my case new rotors and pads all the way around cured the problem completely and this was something like 6 years ago.

wssix99

iTrader: (5)

This is different and things aren't adding up. The BRAKE light and ABS INOP mean different things and shouldn't be related.

When did the two lights start coming on and what did you do to the car before and after? ie: did this start after you changed the brakes?

What is non-stock with regard to the wheels and braking system? Are your custom wheels the same size as stock? Are all four tires the same?

kgkern01

iTrader: (10)

The brake problems began with my engine swap and have been ongoing since then. The car sat for 2 years before I did the engine swap, and since swapping the engine, the brakes have been acting up.

Wheels were 10-spoke SS with 275/40R17 all around, front brakes are C5, rear are stock. Another problem I have is that the parking brake cable was always stiff, hard to pull up, and doesnt hold the car very well. Cable just snapped trying to pull it up about a week ago.

TurbopigB4C

iTrader: (5)

Its is likely something to do with your C5 brakes since they are not what originally came on your car. If it happened after an engine swap it could also be a bad ground possibly. You really need to just pay someone to find out the code that is set. Its crazy to just speculate about the problem. There are way too many components in your ABS system to just shotgun parts.

kgkern01

iTrader: (10)

I know for a fact it's not the C5 brakes, they have been on the car for about 7 years or so. I have looked for a disconnected or bad ground and I haven't found any. I will have to scan it to see what code it is throwing.