Front caliper not releasing

[tomh2012]

My fiance has a 99 suburban that keeps dragging a brake up on the front driver side. Thought that the caliper had failed so I replaced that along with rotors and pads. Three weeks later it does it again. Jacked it up and the caliper piston was stuck engaged on the rotor. Then cracked the bleeder and nothing came out. Finally had to break the banjo fitting on the hose loose to release pressure. I thought maybe this proved that the new caliper was bad. Not the case it is dragging again with a new caliper. What could be the cause for this? Any advise into where to look now would be greatly appreciated.

 

[michael hurd]

It could be the brake hose itself, I have seen that before, where the inner liner collapses partially and does not want to allow fluid to return to the master cylinder.

It could also be an issue with the abs controller, but I would bet on the hose first and change that.

 

[tomh2012]

It could be the brake hose itself, I have seen that before, where the inner liner collapses partially and does not want to allow fluid to return to the master cylinder.

It could also be an issue with the abs controller, but I would bet on the hose first and change that.

I will replace the hose again tonight maybe it was defective... If not I suppose abs controller research will be next on the agenda.

Sent from my LG-LG730 using Tapatalk

 

[tomh2012]

So to update.... I changed the brake hose out tonight and now it seems to be better! Funny thing is the burban was pulling to the right when you hit the brakes. Then out of nowhere the left would drag like none other. Well to make a long story short now there is no pulling any direction. Defective hose is going to carry the blame on this job.

Sent from my LG-LG730 using Tapatalk

 

[michael hurd]

You can probably chalk that up to shops that clamp the hose off when they change a caliper out, they don't want brake fluid dripping everywhere. The hoses aren't designed for that... I have seen everything from vise grips to hose pinch pliers used, when you try and tell someone that's not how you do it, they just look at you like you are from outer space.

Glad you got it fixed!

 

[BOTTLEDZ28]

Like mentioned above, the brake hoses would never be pinched with a tool when changing or servicing the caliper. If you are replacing the replacing then just get the new one ready to go and then remove the hose from the old one and transfer it over the new caliper with new crush washers. It shouldnt take no more than 1 minute to do that. Fluid will NOT spray out all over the place as long as no one depresses the brake pedal. That caliper will have to be bled anyway so just let a few drops of fluid drip out into a pan or something.

Another cause of a caliper getting hung up is dirty slides. Over time, the grease dries up and dirt and debris makes it way into the slides which causes the caliper to bind up. A simple 5 minute douching to them and some new caliper slide grease will ensure they work correctly.

 

[dagen_1]

as mentioned before.. change the hose.. happened to me last fall.. both my calipers froze.. changed them out, froze again, changed the hoses and no problems since.

 

[oohunter04oo]

Every gmt400 I've owned I've replaced the brake hoses because it's pulled one way or the other when braking.

 

[IOWNJUNK]

You can probably chalk that up to shops that clamp the hose off when they change a caliper out, they don't want brake fluid dripping everywhere. The hoses aren't designed for that... I have seen everything from vise grips to hose pinch pliers used, when you try and tell someone that's not how you do it, they just look at you like you are from outer space.

Glad you got it fixed!

I can name a half dozen guys who do this exact same thing, step one is grab the needle nose vise grips. I never understood it, I dont want the same brake fluid in there anyway. And you still have to bleed the system regardless.

 

[tomh2012]

Being I am the one who serviced the brakes with brand new components including hose less then a month ago I can assure you that clamping a hose never happened on this job. However I did slice open the hose at advance to show the clerk that the inner liner was separated on this hose! I have never had an issue with a new hose like this before but now that I have I will not second guess my gut next time. I also clean the slides and grease every movable connection point while servicing brakes to eliminate binding issues. Live and learn quality does not catch everything in manufacturing.

Sent from my LG-LG730 using Tapatalk