Question about 1996 GMC Jimmy

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Grinding under car while driving - brakes dont work HELP!!!!!!!

HELP!
My car recently became a WRECK!!! I start the car. It's mechanically fine. Then the wheels start turning. Half way down the road, I start feeling a clicking sound underneath my feet as I'm driving. Each rotation of the wheel can be felt. It's not smooth. THEN... There's MAJOR grinding under the car and I have to stop the car because it feels like it's going to just fall apart. BUT THEN... I go to push on the brake pedal and IT does not work anymore... I have to push the pedal almost through the floor to slow the car down... So needless to say I have NOT driven the car... Please help and tell me what the problem could possibly be, how much it'll cost to fix etc. so I dont get ripped off... THANKS

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Wow, you have a few problems there. The grinding sounds like a driveline problem. Does the grinding get worse or louder as you increase speed? That grinding could be coming from a number of places. Everything from a universal joint on the driveshaft to the transfer case. Try shifting from 2WD to 4HI. Does the truck go into 4HI? If it does, shift to neutral, and put it back into 2WD. Sometimes the actuator for the 4WD can get stuck. If that doesnt work, can you try to pinpoint exactly where the noise is? I know that sounds hard, and I saw where you wrote you can feel it under your feet. Is it everywhere though? Can you feel it in the steering wheel, for example?
As for the brakes, are they always that hard to stop? Or is it after the grinding starts? Is either the brake or ABS lights on on the dash? Does the pedal feel mushy or very hard? A mushy pedal usually means a bad master cylinder, while a very hard pedal usually means a bad power brake booster. I'll be honest with you, none of what you described sounds cheap, regardless of where you take the truck to get looked at. They are most likely going to charge you for a few hours of diagnostic time just to figure out whats wrong. Thats why I asked if you could try to narrow down exactly where the noise is coming from. Theres a better than average chance your going to get ripped off, simply because it's not clear and obvious what the problem is. Do you know anyone who has any knowledge of cars? If so, take them for a ride and let them hear it. 2 heads are always better than one. If you can think of anything else, let me know, and I'll be glad to try and be of more help.

Posted on Oct 07, 2009

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Sounds like one of the front brake cylinders leaked brake fluid onto a scored brake rotor. The brake rotor was previously damaged by a worn brake pad. The brake pad wore down to the retaining rivets and created a "groove" on the rotor (like an LP vinyl record). The brake fluid in the groove causes the brakes to seize and make a really loud vibrating grinding sound.

Do a brake job yourself ($50):

1. Fill the brake master cylinder reservoir with brake fluid.
2. By now you know which wheel is leaking brake fluid (front right??)
3. Remove tire and wash the area with mild soap (detergent is ok for this).. including the scored rotor.
4. Purchase brake cleaner spray at an auto parts store and spray all brake parts of the afected wheel.
4. Remove / replace rotor.
5. remove / replace brake pads.

If you want to have a brake shop do the brakes ($175), do steps 1 through 4. You should be able to drive the vehicle to the nearest brake shop, after you test-drive the vehicle in your safe driveway..

If the above description does not match with what you find, then do not drive vehicle. Have it towed.

Posted on Oct 07, 2009

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Not trying to oversimplify this, but have you checked the brake pads on the car. It sounds as if the pads are completely worn out and metal is against the rotor. I would check that first ... especially if you have no or limited brakes. The next logical thing is the master brake cylinder id the pads are OK.

Hope this helps

Posted on Oct 07, 2009

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Have the brakes inspected. Sounds like there is a serious problem with them.

Posted on Oct 07, 2009

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