ABS problems

We only deal with direct fit parts. It is hard to answer when we don't know what has been done as far as modifications.

Yeah, it's a bit of a mess. I just converted the PCM to the express van PCM due to a lot of problems like I posted above. I've learned a lot about what was done wrong with the V8 was dropped into this van.

Hopefully I'll have it sorted out shortly...lots of incompatibility between years such as the computer and the transmission that was in there, then the new computer doesn't like the old O2 sensors because of the way they are grounded....not exactly something to tackle in a format like this one. I've got threads going on in multiple tuner sites, but I appreciate the response.

I can't believe they got it to fit. I see you have your hands full based on the picture.

Actually, it fits in there pretty well!

My Astro's brakes have an odd, but intermittent problem. Occasionally when I try to stop, they will make a groaning sound and I can feel the pedal push back against my foot and the van doesn't want to stop. If I continue to push on the pedal, you can hear a thump and then the van will stop short. A couple of times when this has happened, the pedal went all the way to the floor, the brakes released and the van started forward more quickly as the idle speed kicked in. I've replaced the pads, rotors and calipers as well as bled the lines. Do I need a new master cylinder or sensors, or what?

This sounds like the ABS is kicking in because of a bad wheel speed sensor. This video will show you how to find out which sensor is bad.

https://youtu.be/rTtAnsOlZU4

Please run down this guide and report back.

Ok, based on the reply, I suspect a faulty brake booster. I've looked over the diagram and pictures and feel pretty confident about replacing it. I've priced Astro brake boosters online and they're about $275. Is there a way I can test the one I have and make sure that's what I need before I put out the cash?

The booster is hydraulic so the test is difficult. Did you try the scan?

I put on the new booster, and the power steering works better than it has since I bought the van, but now the brake pedal goes all th way to the floor and won't come back up.
I had to take out the master cylinder to get the old booster out and the new one in, so I assume the lines need bled, which I'm going to do in the morning, but the pedal to the floor and not coming up concerns me. Is there anything else I should be looking at?

You most likely just need to bleed the hydro-boost system since the brake booster was replaced. After bleeding the hyrdo-boost system, also bleed the brake system as you normally would at each wheel. Follow the steps below to bleed the boost system, let me know how it goes afterwards..

I tried bleeding the booster and the brake lines (used your instructions and instructions in Chilton manual) and I have the same problem. Did I get a bad booster?

that is possible, or you may have accidentally left something loose such as a vacuum line somewhere or something.

Took the new boost off and put the old one back on and the pedal is acting normally again. The groaning problem is still there, so it's back to the store for a little exchange action. Thanks again for all your help.

I finally got the scanner and found the right front wheel speed sensor was out got a new one for $89.00 all fixed! I love this site.

why does my ABS keep slipping when I apply the brakes? The ABS light does not come on.

what do you mean by slipping. If they are activating, you might have rust build up on the front sensors. I would suggest cleaning the mating surface for the sensor, clean the sensor then road test.

what I mean is that when I apply the brakes it doesn't come to a complete stop. Instead the car still will roll. If you stop far enough in advance then you can pump the brakes a couple of times and then It will stop.

does the brake pedal go to the floor

no, the brakes were checked and said that there was still a few months worth of pad left. They mentioned about taking the rotor apart and checking the gear

when they check the gear, tell them to check the abs sensor for rust build up on the surface area where it mounts

Brakes problem
1996 Chevy Astro 6 cyl All Wheel Drive Automatic
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Antilock brake light stays on all the time

Thank You for your help.. I will have them check it when I take it to get repaired and I will let you know what they said.

The first thing that needs to be done is to have it scanned, this is done with a scan tool that can read ABS or "C" codes, most shops can scan it, write down the codes and post them here...

1995 Chevy Astro

Hi there. Whenever i start my car or i´m in neutral the revs drop like it´s about to stall and then pick up again. I´m constantly thinking it´s about to stall on me! Also my ABS light is constantly lit up. Hope you can help me out! thanks

First off, the 2 are NOT related. The ABS light is a whole seperate problem. The RPMs fluctuating could be as simple as a vacuum leak and this is quite likely. The PCM uses an IAC solenoid to maintain the correct idle speed. If there's a vacuum leak, air in entering the engine somewhere besides where it's supposed to. The PCM monitors the RPMs. When air enters the engine, the RPMs will increase so the PCM closes the IAC plunger. This causes the RPMs to drop again so the PCM opens the plunger again which increases the RPMs. You see the cycle? It just keeps going up and down. Use some flamable carburetor cleaner to spray around the engine while it's running. When you spray the cleaner on the vacuum leak, you will notice the change. Then all you have to do is figure out exactly where it is. You should hear a hissing sound, too if there's a leak. Get back with me and let me know what you find...

Brakes problem
1992 Chevy Astro 6 cyl

The anti-lock and the brake indicator is on in our Astro Van. What causes it to come on and how do I clear it?

I need to know if you have 4 wheel anti lock or just rear wheel anti lock.Look and see on the back side of your front wheel's if you have wire's going to both front wheel's to speed sensor's if you do then you have four wheel anti lock.If you don't then you just have rear wheel anti lock.You have a problem with your abs that's why you have the light's on.I also emailed you how to get your abs code numbers you have let me know what the number's are.I emailed them to your personal email.

There are 4 electrical wires, one going to each tire.
The codes are 6 3 6 3 6 3 1 2 1 2 1 2.
Then they repeat again. what do the codes mean? The charts I've looked at don't help me much because they don't match the codes I came up with.

The brakes are stopping the car fine, but they won't pass my inspection because the brake light is on and I think it is because of the problem in the Anti-lock Brake System.

Thank you so much for your help. I have to get on to other things as there is a hurricane headed our way.

Code 12 is normal it's not a fault code.I emailed you the trouble tree for code 63 to your personal email.

I have a 94 astro and we seem to be having a issue with the brakes. When you go to stop, it wont even try to stop and then the abs kicks in. Its my grandmas van and shes scared to drive it in fear of hitting somebody. Ive rode with her and as she presses the pedal the van wont even feel like it tryed to stop, and the abs kicks in. If i remember right with the abs working the rear tires still lock up. Also its a very random problem.

Hi there,

I would get the system scanned and inspected by a brake specialist a s this is very dangerous, do this asap.

Mark (mhpautos)

CHECK BRAKE FLUID LEVEL

[quote:17ed602a42="tom123456789"]CHECK BRAKE FLUID LEVEL[/quote:17ed602a42]

We have done that many of times. Its not leaking or using any fluid.