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brake issue even after new rotors and pads?

 
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Old 05-13-2010, 04:51 PM
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brake issue even after new rotors and pads?

Alright so on my 92 si when i used to brake the steering wheel would shake like a mofo so i got all new rotors and pads. Well after that when i push the pedal down it doesnt shake anymore obviously but i still have to push the pedal pretty damn far down and when im close to stopped the pedal will slowly sink lower to the floor and it doesnt stop like it should after all new rotors and such? Im confused and a little frustrated
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Old 05-13-2010, 05:28 PM
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Re: brake issue even after new rotors and pads?

sounds like you need to bleed your brakes, but bleed all four of them, it's the best way to go.
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Old 05-13-2010, 05:32 PM
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Re: brake issue even after new rotors and pads?

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Originally Posted by srijos24 View Post
sounds like you need to bleed your brakes, but bleed all four of them, it's the best way to go.


x45662354674535425


you now have air in your lines, which is being compressed instead of the brake fluid when you push the pedal down.


start with RR, LR, RF, LF
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Old 05-13-2010, 06:04 PM
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Re: brake issue even after new rotors and pads?

what they said, oh and don't forget to call a friend over for the job! haha
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Old 05-13-2010, 07:29 PM
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Re: brake issue even after new rotors and pads?

Thanks fellas
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Old 05-13-2010, 08:59 PM
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Re: brake issue even after new rotors and pads?

Also be sure none of the fluid gets on the paint, from what I hear it's horrifically corrosive.
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Old 05-13-2010, 09:50 PM
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Re: brake issue even after new rotors and pads?

master cylinder
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Old 05-14-2010, 01:18 AM
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Re: brake issue even after new rotors and pads?

Quote:
Originally Posted by fezz_tec View Post
master cylinder
x2

Spongy pedal would just be air in the lines, but if the pedal continually falls then the MC is bad
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Old 05-14-2010, 02:58 AM
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Re: brake issue even after new rotors and pads?

do a leak down test turn the car off pump the bake pedal till its stiff hold it down and see if the pedal goes down to the floor if it does then you have a leak in the master cylinder
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Old 05-14-2010, 08:47 AM
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Re: brake issue even after new rotors and pads?

Hey buddy follow what the guys were saying ,things to check the caliper seals,brake lines change your brake fluid ,check around were the master cylinder connects to the brake booster usually brake fluid will leak between the booster and master cylinder ,lastly bleed the system, start at the wheel right rear first.Hope this helps .
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Old 05-14-2010, 09:11 AM
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Re: brake issue even after new rotors and pads?

If the problem with the brakes is intermittent (on and off) then according to my mechanic it's the master cylinder rather than air in the lines. Since you didn't mention frequency I assumed it was every time you braked. If it's the master cylinder (leak in the bearing) when you slam the brakes it'll respond well. My argument with bluesteel is that I've been told my problem is with the master cylinder but the pedal is firm when I press it with the car off. It only falls to the floor on occasion when I brake slowly when driving (that's what I get for being nice to my brakes).
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Old 05-14-2010, 01:32 PM
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Re: brake issue even after new rotors and pads?

Yea if you bleed your system and the pedal still goes to the floor, you probably have a leaking master cylinder.. One way to see if it's the master cylinder is look at your brake pedal by the firewall. If you see fluid coming from the firewall your master cylinder is leaking.. Hope this helps
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Old 05-14-2010, 01:54 PM
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Re: brake issue even after new rotors and pads?

It's not the MC, it's air in your lines. Bleed them.
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Old 05-15-2010, 01:34 AM
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Re: brake issue even after new rotors and pads?

Yes , it is air.
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Old 05-15-2010, 11:56 AM
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Re: brake issue even after new rotors and pads?

hi guys i got the same problem sometimes when i brake its all good and sometime i hit the pedal and its kinda spongi how do i bleed them
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Old 06-26-2010, 11:59 AM
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Re: brake issue even after new rotors and pads?

The guy that said it's the Master Cylinder is probably (99%) right.

I had this very issue and replace the "MC" about a year and a half ago (cheap and easy to do yourself) and it fixed the problem. The shop manual has the diagnostic procedure to confirm where the problem is (also easy to follow).
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Old 06-26-2010, 12:53 PM
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Re: brake issue even after new rotors and pads?

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Originally Posted by fezz_tec View Post
master cylinder
thats what I was gonna say too.
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Old 06-26-2010, 01:16 PM
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Re: brake issue even after new rotors and pads?

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Last edited by kyosukerob; 06-28-2010 at 11:48 AM.
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Old 06-26-2010, 01:25 PM
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Re: brake issue even after new rotors and pads?

Quote:
Originally Posted by InvaderTrax View Post
x2

Spongy pedal would just be air in the lines, but if the pedal continually falls then the MC is bad
x2

bleed them first. LF, RR, RF, LR. bleed the air out completely and DO NOT let the resevior run dry.

if you've bled the crap out of them and it still falls, check the M/C. If there is fluid on the back of the master cylinder where it meets the firewall, you know, on the bottom of it, then your primary cup/seal is bad. Gotta replace the M/C.
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Old 06-26-2010, 03:20 PM
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Re: brake issue even after new rotors and pads?

hey i was just thinking depending on i guess diff type of brakes and rotors every time i have replace rotors and pads i kinda got a spongy feel as well but i already bled everything, didnt have a new M/C but i realized it was just the brakes until i broke them in some sometimes after they got heated up they seem not to work as great.. once i had put maybe a couple thousand miles on them i took them off and they had that thin hazy look to them so i slightly sanded them down without breaking or doing it to much just enough to get the haz off and with that and them getting broken in i didnt have any problems again.. another thing i realized was these were the cheapest thing autozone had... soooo mabye that was the problem here and maybe with mine.. idk just a .02 of my cents.. lol hope this made sense especially after working 12hr shifts haha
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Old 06-26-2010, 05:07 PM
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Re: brake issue even after new rotors and pads?

Quote:
bleed them first. LF, RR, RF, LR. bleed the air out completely and DO NOT let the resevior run dry.
It's RR, LR, RF, LF on our cars. You start with the caliper farthest from the MC and work your way towards it.
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