Dan_s_young

iTrader: (1)

Hey guys, well I just finished putting my brake and car back together after replacing my suspension. When I reinstalled the calipers on the car I used some permantex disc brake quiet on the shims to prevent any vibration. Also I had some confusion with the position the anti rattle springs are supposed to be in so I put one in the way I thought it goes and I left the other out.

So today I tried driving the car, and the brakes seem to be applying constantly...
So I immediately turned the car around and when I pressed the brakes the pedal sank to the floor... ummmm wtf is going on? The pedal should only sink like this when there is hydraulic failure am I right? But the brakes were dragging really hard, I could hear them grinding against the rotor as I was slowly driving...

Please help, any suggestions on what the problem could be can help... Thanks alot

1badFB

iTrader: (1)

Are you confident that you bled them properly? When you pressed the brake, did it just feel sorta squishy all the way to the floor, or did you have good braking, and then it just sorta went away and your foot went to the ground? Did you notice any fluid leaking, or did it all seem to be inside the componants? First thing Id do, is re-bleed everything and make sure everything is tight, and if that doesnt work, check the componantry. Hope this helps.

Dan_s_young

iTrader: (1)

well first of all... I shouldn't need to bleed the brakes, I didn't take any of the lines off or anything... Or am I supposed to? The way I was taught said you shouldn't have to unless you open a line up... No, no fluid leaks, the pedal was first still (I had pumped it up after I applied the disc brake quiet as the instructions say. After the pedal sunk to the floor again I was able to pump the brake back up... So maybe I do need to bleed my brakes?

Dan_s_young

iTrader: (1)

anyone have any ideas? I would like to get my car over to my grandpa's as soon as I can for the winter (only like a 4-5 km drive).

rotor vs. piston

"well first of all" someone is being a bit snippy, dood don't get snippy like YOU KNOW EVERYTHING while YOU are asking an efing question.

You asked, someone tried to help with the info. YOU gave. We are not there holding your hand.

rotor vs. piston

It depends, your master cylinder could have gotten low while you were doing the brakes and let air in the lines but when you pushed the cylinders back in and you checked the fluid everything looked good.

Why did you do the brake job? Just normall worn pads or something else?

Maybe by some unhappy coincidance your MC is/went bad (you describe symptoms of this)

Allot of times it's go CYA to bleed the brake system while your doing brake work anyway. Also when is the last time you flushed your fluid?

rotor vs. piston

Too, depending on how old your calipers are, you may have knocked some rust or other debri from the piston into you line clogging it, this would cause your brakes to drag.

Dan_s_young

iTrader: (1)

lol first of all you got me wrong, im not snippy at all. I just was disapointed today when my car didn't go as planned... I got frusturated because I have been going to college and I have removed and put together brakes multiple times without problems, annoying when things don't go as planned.

Anyways, I found out part of my problem, the bottom of the one backing plate was bent over and hitting the rim as it went around... yikes good thing I didn't go too far. Second problem is that the pistons need to be pushed back with a C-clamp. As far as the brake pedal going to the floor so far I have no idea, I guess I will push the piston back and see what happens tomorrow. Thanks for the help, I appreciate it.

rotor vs. piston

I put myself in your shoes and figured you were just peved that your hard work didn't go well. We all need help man.

GavinJuice

what do you mean the piston needed to be pushed back with a c-clamp. If you were just replacing your pads from regular wear then you should have had to push BOTH calipers back to fit your now thicker pads in. If you didn't have to, then you might have a caliper with a piston thats rusted stuck, or maybe you cocked it in the bore when you compressed it. But that still doesn't explain the loss of pressure.
Only thing i can think of is you didn't pump the brakes a couple times after installing the new pads, but you said you did. Might take half a dozen times though.
Also a quick test for a bad MC would be to pump your brakes, hold, and then start your car. Your pedal should drop about an inch, if it doesn't or does more then it's bad. Also coming to a stop, if you get a pedal creep then you've got an internal leak.
And if you've got drums, check your wheel cylinder for leaks, in fact check everything out.

Dan_s_young

iTrader: (1)

Hey, thanks for the tips first of all.

But what happened is I didn't replace the pads, I just had to take the caliper off to get the suspension off. But then when I am replacing the caliper over the pads it is clamping the brakes together and making them drag....

and also, I don't mean to be an *** or anything but that test you said about the pedal dropping a inch, that is testing the vacuum brake booster not the master cylinder...