Brake Judder (Shudder?) PLEASE HELP!!!!!!!!!!!!

You better check all other wheels too, just to be sure.

For this wheel, unless if that etch on the rotor does not cause any problem, I think you should be fine with the fixes you carried out.


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Okay so the new thing Im on is to bleed the brake lines. I feel that it could have air bubbles in it, and after some breaking the pressure builds up and is fine? anyone have any thoughts on this thinking?
 
fxswag said:
Okay so the new thing Im on is to bleed the brake lines. I feel that it could have air bubbles in it, and after some breaking the pressure builds up and is fine? anyone have any thoughts on this thinking?
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You mean you need to depress the brake pedal more than once to get a pressure build up and bring the car to effectively slow down / stop? If so it is not normal and you may have air in the system.

Anyway, I am not sure what is the update on your case after the new brake line install, if it is confirmed that you had an overheat, your brake oil would have been spent and lost its properties due to overheat, and you are better off flushing your system with a new fluid anyway, that would take care of the air bubbles too.


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I don't need to press it more than once, but I feel like the brake pedal travel is greater at the beginning? It usually goes like this, during my first brakes of the day, I depress, the shudder/skipping/noise/judder happens and I depress, and press again. However, if I don't depress and continue pressing it will brake-but I feel like it is skipping like the almost abs feel i described in the original post with less than maximum stopping power. And than it travels less as it builds up-I cant really confirm this but I feel like it? Im not sure where you got the idea I was doing a new brake line install. definitely not the case. was already stupid enough to buy pads without checking them because I was "sure" that was it but obviously not, so Im not trying to go around replacing components until I know. do you think bleeding the system is worth it? It is getting really bad these days and I need to fix it ASAP!
 
fxswag said:
I don't need to press it more than once, but I feel like the brake pedal travel is greater at the beginning? It usually goes like this, during my first brakes of the day, I depress, the shudder/skipping/noise/judder happens and I depress, and press again. However, if I don't depress and continue pressing it will brake-but I feel like it is skipping like the almost abs feel i described in the original post with less than maximum stopping power. And than it travels less as it builds up-I cant really confirm this but I feel like it? Im not sure where you got the idea I was doing a new brake line install. definitely not the case. was already stupid enough to buy pads without checking them because I was "sure" that was it but obviously not, so Im not trying to go around replacing components until I know. do you think bleeding the system is worth it? It is getting really bad these days and I need to fix it ASAP!
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Sorry I mixed up, there have been several brake issues and I do not seem to keep track, it was not you who was going to install a new brake line.

I just need to push the pedal once, it travels half way which is enough to kick the ABS and feel hard deceleration, I can push it all the way to the floor but it will be a very hard job, anything other than this I would consider not normal.

So you were going to find out if you have an overheat issue or not right (I hope I am not mixing up again), if you change the fluid and still have an overheat then it will be like throwing new parts again. So first you really need to find out and fix that first, tha would be the first thing I would do if I was you.


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gotcha-yah I totally agree. I just had talked in through with some other car buddies and we kind of decided that the overheat-->warped rotors would make the problem present ALL of the time, especially at high speeds and be accompanied with some steering vibration which I definitely do not get. Thank you so much for helping me with this, give me your final thoughts and I will go with that one this weekend! (buying a bottle of brake fluid is not to bad on the wallet) so again whichever you think ill do! Again, thank you dude!
 
fxswag said:
gotcha-yah I totally agree. I just had talked in through with some other car buddies and we kind of decided that the overheat-->warped rotors would make the problem present ALL of the time, especially at high speeds and be accompanied with some steering vibration which I definitely do not get. Thank you so much for helping me with this, give me your final thoughts and I will go with that one this weekend! (buying a bottle of brake fluid is not to bad on the wallet) so again whichever you think ill do! Again, thank you dude!
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You are welcome, if you still want to try and kick the air out, here is what you need to do:

nute8age.jpg


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Ataher said:
You are welcome, if you still want to try and kick the air out, here is what you need to do:

nute8age.jpg


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hi guys, i also have brake judder when braking at higher speeds..if the judder is mostly coming from the peddle, then it most likely the rotors and if the judder is coming through the steering wheel then it is most likely a stuck piston...this is what i have read up about...i only get the judder when braking at high speeds..will take it in next week to check.
 
OK so i did a brake bleed on Thursday night, got some air bubbles, nothing out of the ordinary except maybe a little bit more from front drivers side. test drove, and decided to bleed front brakes again. So in initial bleed after 3-4 times on front drivers side, no air came out. on second go at bleeding, again a bunch of air bubbles came out of front drivers side. could something be introducing air into the system. inspected the whole car/ brake lines/master cylinder/ neck of the brake peddle and nothing looks out of the ordinary. IT DID NOT FIX THE PROBLEM!!!!! I dont know what to do. To correct my orignal post it is less of a shudder/judder and more when you press to hard you get a kind of grinding noise that sounds like the ABS system kicking in or pads worn. the pads are fine, as are the rotors. SOMEBODY, PLEASE I AM DESPERATE, I dont know what to do. I know its not rotors bc it doesnt happen at high speeds and goes away after its warmed up, but 1x last week it didnt go away! sometimes it is there and sometimes it is not. My last thought is previous owner put pads on that werent OEM? maybe this is why it disappears after its warmed up. My last thought is resurfacing the rotors and putting new pads on, otherwise I AM GOING TO SELL THE CAR, thats how crazy this is driving me. Please I will seriously do anything for someone that can diagnose this. Thanks for looking/any opinions
 
If each time you bleed there's air, then you're not done bleeding. Is it possible that you let the brake fluid reservoir get low/empty while bleeding that you sucked in air? Bleed the passenger rear, then drivers rear, passenger and then driver side. Is the caliper secure? If nothing else change the pads as it doesn't cost much.



TapaTalkin'
 
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Thank you very much for response. We had a third person watching the reservoir so it definitely never got low. The first time around the air bubbles were done coming out, test drove, and than when we decided to bleed it again, there were more air bubbles. I actually have a set of new pads to put on, but there is a ton of the pads left right now so i really dont think thats the problem. its whenever a hard brake occurs, it honestly feels really unsafe to me. I believe the caliper is secure as it only happens on a hard brake. if it was unsecure i would feel it all the time, right?
 
I agree with PMG, as long as you are still getting air bubbles out it means you are not done bleeding, I can confirm that in my last brake job, when I loosen the bleed valve I get pure oil coming out and no existing of any bubbles so you should expect the same.

Are you submerging the other end of the vinyl tube in a container full of oil? Because that would be the most accurate way to truly confirm you are getting bubbles, an idea of quantity, and most importantly if the quantity is getting less as you continue bleeding.


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Today it was happening all the time during hard braking-when i first started noticing it a couple months ago it would only occur during the first stop or two, and than go away. Now it is a pretty constant and I have adjusted my braking technique to avoid this-softer braking.
@Ataher-thanks for your response to! yes we have the vinyl tube submerged in a container full of oil so we can watch for air bubbles. We did it on each corner (farthest to closest) until all air bubbles stopped. so this was like 4-5 times of pumping/holding down/bleeding (whatever you want to call it). test drove the car. we decided to do the front brakes AGAIN. and this time, after air bubbles had quit, the front driver side had additional bubbles the first time we did it for the second time? if that makes sense haha. so first go, pump one-bubbles, pump two-no bubbles, pump three-no bubbles, pump 4-no bubbles. test drive. do it AGAIN, first pump-air bubbles, second pump-no bubbles, ect.
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I can't seem to understand why you keep messing with this. Go down to pepboys and for $60 they'll do a machine brake fluid change. No air will be in your system at all and you'll have fresh fluid. Or take the car down to a Nissan/ Infiniti dealer and get the whole thing looked at to find the cause.

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i havent been messing around with it, ive been trying to diagnose a problem just as someone at a dealership would do. And between myself and the guys i work with, we have more experience with cars than anyone working at a dealership. and i thought the point of forums and sites like this was to try and help eachother, as all of the posts until yours have been, and ive been extremely appreciative of everyone's time, thoughts, and suggestions. so thanks for your two cents i guess
 
fxswag said:
i havent been messing around with it, ive been trying to diagnose a problem just as someone at a dealership would do. And between myself and the guys i work with, we have more experience with cars than anyone working at a dealership. and i thought the point of forums and sites like this was to try and help eachother, as all of the posts until yours have been, and ive been extremely appreciative of everyone's time, thoughts, and suggestions. so thanks for your two cents i guess
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You started this thread June 27th,

Check post #4, 7, and 11....

Yeah my 2 cents were put in the beginning of this thread 1.5 months ago trying to help you out. So yes, you have been messing with this problem since June 27th.... It is now August 12th.

If you're soo fed up with this:
" SOMEBODY, PLEASE I AM DESPERATE, I dont know what to do. I know its not rotors bc it doesnt happen at high speeds and goes away after its warmed up, but 1x last week it didnt go away! sometimes it is there and sometimes it is not. My last thought is previous owner put pads on that werent OEM? maybe this is why it disappears after its warmed up. My last thought is resurfacing the rotors and putting new pads on, otherwise I AM GOING TO SELL THE CAR, thats how crazy this is driving me. Please I will seriously do anything for someone that can diagnose this. Thanks for looking/any opinions"

Take it somewhere because you and your friends don't have a clue what your doing. We have given you suggestions starting from post #2. All you have seem to do in 1.5 months is TRY and bleed the brake lines. YOU posted how DESPERATE you are with this problem. If you're desperate, get it correctly diagnosed by taking it to a dealer.
 
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Toy4x, I see threads every day with 5,000+ posts and counting where people tell other people how they feel and what the saw today :) which I respect, the poor OP is trying to fix something on his own and learn about it, I respect that too. I would respectfully suggest that if it really bothers you then you can unsubscribe from this topic so you don't get to see this no more, you last advise remains valid (maybe the OP is better off going to the dealer) but the attitude i guess is not.

I can not deny that when i try to help, i suffer sometimes from lack of details from the OP's, they usually do not keep track and have poor follow up, most importantly they do not usually feedback when the issue is fixed, which is not what the forum as a tool is expecting, but they are not clients and we are not service providers, as long as people keep responding means there is still a good will and patience.


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