86 brakes problemo

[seek]

hey guys

replaced my brake bads with some EBC blacks yesterday, as my old pads were really worn (note: fucking worn)

anyways... abit of a background.

removed old pads, and obviously the piston is sitting out too far, so i grab a D-clamp and push her back in, fit the new pads in and bolt the caliper to my strut.

reason for pushing the piston is because if i didnt, there would not be enough of a gap to slide the rotor through

first thing i noticed was that the pads were restricting the rotor/hub from spinning. i thought it would sort itself out in a few laps of the block etc.
then i went to push the pedal for the first time, and the pedal went REALLY spungy. so i bled the brake lines, and it DIDNT fix the problem. but my calipers are now not restricting my rotors.

there is also now a slight squeek coming from my brake/calipers when i press the brakes.

note:
- no visible leaking from master cylinder or booster (inside cabin or out)
- no noticable loss of fluid from the resivior
- brakes were working perfectly fine before i put the new pads in
- rear wheel cylinders don't appear to be leaking


i have no more ideas, and even a few calls to knoledgable people had them both stumped. wtf must my car even give me problems with simple fucking brake pad changes :rant:

any insight guys?

thanks.

[anastasios]

did u bed the brakes in?

[seek]

its alright guys its now fixed, didnt know what was wrong, but I'm not interested in fucking around, so i just replaced the booster/master and fitted my other calipers.

[Hen is a total nutcase]

This could have been caused by a partly worn/rusted master cylinder. I've never seen it myself, but have been told about it a couple of times.

In normal use you only use, say, the top half of your brake pedal travel. So only half of the master cylinder length is used. The far end can get caked in crap and rust with no ill effects. But then when you bleed the brakes you push the pedal to the floor, and the piston seal scrapes over the rusted, crap encrusted master cylinder bore. And roots the master cylinder piston seal. Meaning spongy brakes.

As I've said, I've never seen it myself, but the story makes sense to me.

Hen

[Bobomacho]

you have old rotors so there must be some sort of wear which woudl give you even the slightest clearance to not have the rotors lock


i'd say u made a boo boo there somewhere. check that the pads you put in aren't already pre-shimmed and you haven't stacked them.
if thats cool then it could either be bad batch of pad or wrong ones! just sand half a mm off each pad then see how that goes. pump up the brake pedal and see if the rotors lock again.

i know you said u didn't want to fuck around but there is a good lead

EDIT: oh yeah and the squeak is probably because they were locked and you went for a drive they got cooked and became glazed