Hi,
I know it's been asked a million times but I can't seem to find the answer with my searches.

I need a scan tool to auto bleed the ABS unit.

Car is a 1994 LT1 with the OBD1 computer but with the OBD2 connector.

Thank you,
Bob

 

Bob,

GM Tech 1 or 2 would work, so would a Snap-On MT2500 I believe. Both are around $300-$500 used on eBay, may or may not have the proper cartridge. Bosch made the system, so I'd imagine some of their current tools may be able to interface with the ABS, but I haven't put too much effort into confirming it.

What area are you located at?

A cheaper option would be to bleed your brakes, then go out for a drive and slam on the brakes a few times to cycle the ABS. This should exchange any old fluid in the ABS with fresh fluid. Bleed the brakes again afterwards, and you should be able to get the rest of the old fluid and any air out of the system.

 

I'm located outside of Indianapolis a few miles. Little uneasy about buying a used scan tool, might be getting someone else's problems and didn't know what cartridges were needed. Guess it boils down to not wanting to spend 500 bucks and find out I need to purchase other items to get what I need. What about the Tech2 clones?

Read that slamming on the brakes would not work for this ABS unit, didn't seem to work for me on a gravel road.

I bought this car with around 30,000 miles, it now has 218,000. The brakes have never worked that well, at least I think they should be much better. On dry pavement I can't get the tires to skid or the ABS to operate. I pushed as hard as I could with both feet and blew out the brake booster once. Don't get me wrong car will stop but brakes on my C3 work so much better. Would think the C4 would be much better but it's not.

 

Find a service garage that's been around for a while and see if they have the scan tool If not they may know someone that does. That's what happened to me when I had my abs pump changed. They borrowed the tool from another garage.

 

If you were close to Houston I'd let you use mine.

A shop might have the tool and use it. I don't know what all a Tech II clone can do in these cars, I'd presume it would work if it was a good clone though. They've gotten cheap since the last time I looked.

Does the ASR prevent you from spinning the tires in the rear? The ABS and ASR function together. Can you lock the wheels up on dry pavement? I've had to hit the brakes a few times before they actually locked up the wheels, very unnerving on the highway.

I do understand not liking the brakes, it has taken a lot of spare time to get mine kinda sorted. Found out over the weekend that I had absolutely NO brake fluid going to the rears. Changed out the master cylinder and I had a leak from the left rear banjo fitting from when I had someone change the brake hoses out. I swear it never ends on this car.

Things I have changed in pursuit of good brakes:
- Master Cylinder (Warrantied the last one because of no fluid from the back)
- Brake Booster (Check valve failure)
- Hoses (Due to age, hope to have Banjo Bolt installed Thursday night weather permitting)
- Brake fluid every year, flush 1 liter, cycle ABS several times then flush 2nd liter to remove that fluid
- Pads when I flushed the fluid the first time

These were world class cars once upon a time, brakes included. It certainly doesn't seem like mine was, but here's hoping soon it is.

 

I bled my 94 without a scan tool. Just bleed the controller first. And have plenty of towels just in case.. I used a Mityvac.

 

Uneasy buying old Tech1, but willing to buy a knock off Tech2.

Strange times we live in.

 

You can bleed it manually- you do not need a scan tool.
In the FSM, go to Section 5, page 10- the procedure starts there.

I have done it before this way- just follow the FSM.

 

I live in Houston and in need of doing an auto bleed on my 1995 gmc sierra...can't seem to find no shops available

 

You can bleed it with a mityvac unit. No tool necessary.