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Question:

My car makes a knocking sound when i push the brake.?

Ok I have a 2001 Chrysler sebring sedan 6cyl 2.7L, and when I my brake it kind of stutters and makes a knocking sound. On a scale of 1 to 10 1 being barely pushing the brake and 10 being pedal to the floor. it usually happens between 5 and 7. The stuttering feels kind of like one part of a brake disc is thicker than the rest and when the pads hit that part the car slows much more quickly ,btu that part is no big deal. what i‘m really worried about is the knocking i get when i push the brakes between 5 and 7. There is nothing wrong while I‘m driving it only happens when I push the brakes. Thanks

Answer:

I had a short tap or knock noise when applying the brakes in drive only. I changed the rotors, the calipers, and the pads at the same time. It started after I did this. I found out by jacking up the front end and listening to the brakes (when applied) and (I spun the tires manually mind you) one at a time, by using common sense, I out a screw driver in the small area between the top of the brake pad and the caliper, and found out there was too much travel from the holes that support the brake support pins. I changed the pads making sure to match up the bad pads to a pair of new ones, (with a small diameter brake support pin hole). That was the issue. The pads from Advance Auto,(ceramic wearever-about $50), were machined incorrectly. Problem, solved.
If you can feel it kick back in the pedal it is your ABS. Probably have moisture in your braking system. Have it pressure flushed. This should be done every two to three years in any car with ABS. If it makes the car shake it is a warped rotor usually caused by riding the brakes. Have the rotors turned or replaced. Edit: Yes you can check run-out of the rotor with it still installed on the car. Lift the suspect corner and remove the tire and wheel. Place a solid item like a jack-stand right against the outer edge of the rotor without actually touching it. Now turn the rotor and watch the air gap. If it increases or the rotor touches the reference item then that rotor is warped. Also look for blue scoring in one specific area. Try this. Accelerate to 60 km/h (40 MPH) and hit the brakes hard but do not stop. Now accelerate to 80 km/h (50 MPH) and do the same then 100 km/h (60 MPH) and again brake and then to 100 km/h again and brake HARD until you are almost stopped but accelerate again. Now try not to stop for about 1 km and if you have to don't hold the brake pedal down while stopped. Many times this will clear up a warped or contaminated rotor.
Is it not your ABS (Anti lock braking system) If you push hard enough to brake to make your wheels lock then the brake calipers will bounce off the discs rather than lock on, thus preventing a skid. If your braking is reduced it could be another problem or grime on the pads. Also if you have had the car a while and never had this before your brake pads would be worn right down. GET IT CHECK OUT NOW! If it's metal on metal with the pads worn down it could cause other problem and prevent your stopping as it warms up. If it's a new car or you just bought it from a garage it's probably just the ABS
I had a short tap or knock noise when applying the brakes in drive only. I changed the rotors, the calipers, and the pads at the same time. It started after I did this. I found out by jacking up the front end and listening to the brakes (when applied) and (I spun the tires manually mind you) one at a time, by using common sense, I out a screw driver in the small area between the top of the brake pad and the caliper, and found out there was too much travel from the holes that support the brake support pins. I changed the pads making sure to match up the bad pads to a pair of new ones, (with a small diameter brake support pin hole). That was the issue. The pads from Advance Auto,(ceramic wearever-about $50), were machined incorrectly. Problem, solved.
Is it not your ABS (Anti lock braking system) If you push hard enough to brake to make your wheels lock then the brake calipers will bounce off the discs rather than lock on, thus preventing a skid. If your braking is reduced it could be another problem or grime on the pads. Also if you have had the car a while and never had this before your brake pads would be worn right down. GET IT CHECK OUT NOW! If it's metal on metal with the pads worn down it could cause other problem and prevent your stopping as it warms up. If it's a new car or you just bought it from a garage it's probably just the ABS
If you can feel it kick back in the pedal it is your ABS. Probably have moisture in your braking system. Have it pressure flushed. This should be done every two to three years in any car with ABS. If it makes the car shake it is a warped rotor usually caused by riding the brakes. Have the rotors turned or replaced. Edit: Yes you can check run-out of the rotor with it still installed on the car. Lift the suspect corner and remove the tire and wheel. Place a solid item like a jack-stand right against the outer edge of the rotor without actually touching it. Now turn the rotor and watch the air gap. If it increases or the rotor touches the reference item then that rotor is warped. Also look for blue scoring in one specific area. Try this. Accelerate to 60 km/h (40 MPH) and hit the brakes hard but do not stop. Now accelerate to 80 km/h (50 MPH) and do the same then 100 km/h (60 MPH) and again brake and then to 100 km/h again and brake HARD until you are almost stopped but accelerate again. Now try not to stop for about 1 km and if you have to don't hold the brake pedal down while stopped. Many times this will clear up a warped or contaminated rotor.

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