Question about 1995 Pontiac Bonneville

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My brake pedal is pushing back at me and its making a grinding noise. alos hard to stop, but pads are ok

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Sounds like it may be the power booster, check to make sure there is vacuum going to it. if so make sure the valve on the end of the hose is a one way valve...Hope this helps??

Posted on May 23, 2011


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Brakes fail traveling at15/20m makes a grinding sound, but brakes ok at speed.

A grinding sound usually suggests metal to metal contact but, as you say, you have changed the pads and disks.

What springs to mind is that that the brake backing plate - the metal disk on the inboard side - are being touched by the spinning disk, or the noise is being caused by a driveshaft or bearing.

However, there are other possibilities. Are there any shims in your braking system? Shims hold the pads in place and stop squeal/rattle.

It also could be that the pads are not being fully released from the disk when the brake pedal is pressed. Depending on your calliper set up it may be something as simple as a slide that is sticking and needs cleaning.

Brake pads are released from the disk by what is nothing more than the spinning of the disk 'knocking' things back. Assisted by rubber sleeves on 'slide pins'. Something may be sticking and need cleaning and a smear of copper grease added.

It would be too easy to say that you have a vacuum leak (or internal seal) problem in the brake servo. A servo problem usually results in a 'hard' brake pedal at all speeds. You don't have this problem.

It may well be that your brakes feel 'spongy' at low speeds because the pads are not being shoved back from the disk because of sticking slides (depending on your system).

It also may be that the pistons in your calliper are sticking.

You obviously can work on cars and use tools - consider overhauling your brake callipers (look on Ebay for overhaul kits) but bear in mind that doing this also means you have to bleed the brakes.

May 03, 2016 | Cars & Trucks

2 Answers

I have a 2006 f-250, i have a grinding noise that sounds like it is coming from the rear wheels, but when i apply the brakes it stops.

How To replace front Brake Pads. In 90% of the car manufacturers the job will be done the same way. This is F250 Ford 2006

Jul 26, 2014 | 2003 Ford F250

1 Answer

Why is it so hard to apply brake pedal?

_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.

Apr 30, 2014 | 1984 Buick Skyhawk

1 Answer

Grinding from wheel

no year, no mileage.
bad brakes, top list.
get it serviced. now.
not checking pads (for wear) and rotors for damage, every 20k, invites this.. brakes dont last for ever on any car.... get it services, better get a 100 point inspection , if you tend not to do them at all.
its a danger to you and us, on the road.

Feb 09, 2014 | Toyota Tacoma Cars & Trucks

1 Answer

Why does my brakes make a crunching noise when i push on the brake pedal? it only does it when im stopped but when im moving its fine?

Your brake pads are likely worn to nothing and grinding on the rotor. Either that, or one of your rotors are warped. Please take it to a mechanic for repair. This is not safe to drive around. Pads are cheap but rotors can get expensive and you will definitely need new rotors if you continue to drive with no pads.

Jul 24, 2012 | 2003 Oldsmobile Alero

3 Answers

WHy dose my brake pedal push back and make a grinding noise

Look through the openings in your front wheels and look at the front rotors-are they gouged up? You are probably running metal-to-metal, pads to rotors.
Chances are real good your rotors will have to be replaced along with new pads, but if you catch it early enough you might be able to have them machined, although nowadays that is hardly easy to get done and the savings usually is not as significant as it once was.

May 23, 2011 | 1995 Pontiac Bonneville

2 Answers

Grinding sound when I break and after I break. It

You are correct. The pad has worn down to the steel backing pad, and now you will have to replace your brake rotor as well.

Feb 26, 2010 | 2002 Mazda Protege

1 Answer

When I apply the brakes on my 2001 GMC youkon about 2/3rds of the time I hear a grinding type noise that I can feel in the brake pedal. The truck stops fine the pads rotors etc. all look good. Any ideas?

When you say the pads and rotors look good, did you actually remove the wheels and check them? A lot of times the outside pad will look ok, but the inside pad can be right down to the metal backing plate. If you can get under the truck, run your finger across the rotors on the inside of the rotor. It should feel smooth. If it feels rough, the inside pad is gone. There really isnt any other reason you would both hear and feel grinding in the brakes.

Nov 21, 2009 | 2001 GMC Yukon XL

4 Answers

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

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.

Oct 07, 2009 | 1996 GMC Jimmy

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