2000 Montana front brakes

[chris_eitniear]

Hi all,

I'm having a problem with the front brakes on my 2000 Montana. The ABS light recently started coming on after about a mile of driving, only to go out when the van was resarted. Now, the front brakes will not entirely release. I've checked the pads, and they're fine. Somehow the fluid pressure in the calipers is not being released. I'm not sure what the cause is, but it affects both front brakes equally as there is no pull to one side or the other while driving.

Any ideas?

[cdru]

The ABS light will set an error code the dealer can pull. I'm betting that there is a malfunction in the ABS system that is not allowing the modulator or something release properly.

[chris_eitniear]

Originally Posted by cdru

The ABS light will set an error code the dealer can pull. I'm betting that there is a malfunction in the ABS system that is not allowing the modulator or something release properly.

Is this something only a stealer...oops dealer can do? I don't have an OBD II code reader, but owning a Montana, I'm thinking its a good investment.

[dj8081]

The local AutoZones will hook up a Tech II to give you an error code. The cost is free!

[chris_eitniear]

No AutoZones in my area. I did go out and get an OBD II scanner and it shows no codes at all. I took it out for a test drive and the ABS does work, the front brakes just don't completely release. Since the ABS actually releases the brakes during hard braking, I'm not sure what to think.

[maxwedge]

Make sure your brake fluid is not contaminated with something like p/s fluid ( easy mistake to make) look closely at what is in the m/c see if it is forming an emulsion or feels oily.

[chris_eitniear]

Originally Posted by maxwedge

Make sure your brake fluid is not contaminated with something like p/s fluid ( easy mistake to make) look closely at what is in the m/c see if it is forming an emulsion or feels oily.

Well, I've had the Montana since last June and have never added any brake fluid to it, nor has anyone else since I've owned it. I did check it yesterday and the fluid itself looks normal.

[chris_eitniear]

Sorry for the multiple post. As an update, it is just the drivers side that is dragging. I had thought if it was only one side that it would pull to one side or the other, but apparently not. I pulled the passenger side this morning and it is fine. I pulled the drivers side again and after my test drive last night, found that the nuts on the wheel cover were melted to the lug nuts, also I found that the pads are definately heat damaged and will need to be replaced. The piston on the caliper still will not return all the way using a c clamp and an old pad to squeeze it back. I'm thinking its the caliper or a restriction in the brake line. Visually inspecting the brake line shows no kinks or other damage to it. Anything else I should check before making a trip to the parts store?

[1999montana]

Chris,

The ABS 'pump' could be faulty, but I think a common problem with disc brakes might be the culprit. The caliper is probably seized due to the winter conditions and salt that may have gotten passed the boot on the caliper. Wouldn't be surprised if the boot has a crack or hole in it. If not, moisture in the brake fluid may have caused it to seize.

Replacement time for sure. I'd replace the rotor too, about $44 Cdn, but less in the states for economy rotors, no point in going for the expensive ones, I’ve had better luck with the economy ones. Others may disagree. Definitely go for aftermarket pads.

The GM pads are junk and hold moisture against the rotor causing it to grow 'barnacles', usually on the inside where they can't be seen. The barnacles usually can't be machined out either if they have been there for a while. The original GM rotors are prone to rust.

With that much heat being generated, the rotor is probably warped and should be replacing or you will not get good pad to rotor contact. (Usually recognizable by a pulsating brake pedal).

Might be concerned with the hub / wheel bearing too due to the heat, but you will have to wait and see if it goes south later on.

.

[maxwedge]

The hose could be collapsing internally, first check the caliper by opening the bleeder and see if you can depress the piston, if not the caliper is bad. Then crack the hose where it connects to the metal line, now this must be done when that brake is dragging, if the brake still drags the hose is holding pressure .if it releases then suspect the abs unit, but I think the abs is the last thing that would be wrong.

[chris_eitniear]

It did turn out to be the caliper. I changed the caliper, the rotor, as well as the pads. Both sides on the pads. I test drove it and it seems to work just fine. Thanks everyone for your help!