Hi guys

My MOT runs out on fri (yearly inspection in the UK) , i knew the brakes needed done so bought front and rear discs and pads, now the brakes were working fine but after replacing them last night they are now poo, they feel a tad spongy and when i got back from the test drive both fronts were smoking.

Below are pictures of the inside of the old discs, as you can see they are a tad rusty where they shouldn't be , is this a sign of seized pistons?? the sliders were all free and the pistons did go back in all be it not so easy (only had a screw driver).

drivers front



passenger front



all 4



this is how the new disks, as you can see the rears arent doing much and the 1 front discs is still score free near the hub

ns rear



os rear



os front



can i really have 4 seized callipers?? they worked fine before i changed the discs

or could it be that i haven't pushed the pistons on the callipers back far enough, if so what size of g clamp do i need to buy??

the front pads all had 2 anti squeal pads each and the rear had 1 per pad, my last celica never had any and never squealed.

im just a tad stumped as i did this with my last celica (a few times) without any trouble..

so HELP lol

Kev

Did you bleed the brake lines?

You need to bleed the brakes either that or one of the brake lines could have gotten damaged, make sure you still have brake fluid in the master cylinder.

uh, yeah, bleed em and bleed 'em good. You've got air in your lines.

X2 on the brake bleed, and also check your lines, if they are the stock rubber one could have cracked while doing the rotor swap.

new pads and discs need some time to settle.. my discs had some sort of clear coating (almost unnoticeable) and upon initial use, the car felt a bit slippery and the brakes didn't function as well. but after a few days it got better and better. just give it some time.

>

agreed....you`ll need to give the discs and pads time to bed in.....after a few hundred miles if the problem continues then you should investigate further.

bleed the brakes, and the smokes could be from you not cleaning the rotor. new rotor has some oil or coating on them to prevent em from rusting on the shelves.

After you've bled the brakes, you might want to take the time to properly bed-in your new equipment. This is a useful overview: http://www.stoptech.com/tech_info/wp_bedincontents.shtml

>

excellent response.

If you didn't unbolt the brake lines, bleeding doesn't do anything. (Although you should flush and replace your brake fluid every 2 years)
Proper bedding procedure is very important and more then likely why you are experiencing the smoking.

did you just install the rotors, without any cleaning?
they come with a coating on them to keep them from rusting, you need to clean that off with brake cleaner before you install them.
if you didnt do that, chances are the pads will never bed-in properly.

no didn't bleed them guys, as they felt fine with the old discs and pads i didn't think they would need bleeding as i wasn't doing anything that would allow air into the system.

and yeah i cleaned the brake discs with brake cleaner, made sure there were squeaky clean lol

did you clean up the slides on the caliper mount and regrease em?

i had juss changed my rears pads and rotor, did u break in the rotors by riding on the parking brake a lil and ridint the pedal a lil too?

^ Dude you don't break things in by riding on your parking brake. That is very WRONG. Also the parking brake is INSIDE the rotor hat, not on the braking surface


cliffnotes: parking brake is a no no and riding your brakes doesn't break in pads.

well today i took the anti squeal pads off (completely) and cleaned every bit of the brake callipers and carriers , even took out the bits that the pads sit in and gave them a good going over, was surprised at the amount of crap i was able to clean off, put everything back on and there was an instant improvement, took the car out and the brakes were loads better, better than the were with the old brakes.

i still have a little prob though , the outside rear pads are still not making full contact with the discs (inside pads are fine, see pics) the callipers aren't seized as the wheels spin freely and got Jan to sit in the car and slowly apply the brake while i spun the rear wheels, and they don't get very hot after a drive so no dragging, is this just a case of the rears needing a bit of time to wear in as they don't do much of the braking??





This post has been edited by kevstir: May 2, 2009 - 7:39 PM

having a bit of a look about im starting to think iv been sent the wrong rear discs, there is 2 discs for the gen 6 , pre facelift >08/95 and facelift 08/95> , i bought them from buypartsby and phoned them to make sure i had added the right discs to the order, the guy confirmed i had, the parts number is J3312032 08/95> so 95 onwards, now looking at japarts.co.uk they have that part number as >08/95 prefacelift , from what i can gather the only difference is that the disc is 1mm thinner, 9mm instead of 10mm for the prefacelift.

has anyone got access to the nipparts parts catalogue?? been looking for it online but not having any luck.

Kev

well finally got somewhere, NIPPARTS brake pads are ****E!!! and i bet the discs will turn out that way as well.

no matter what i tried i couldn't get the outside pad to make full contact with the discs, cleaned everything i could, pistons and sliders both moving fine so no seizing, tried filing some meat of the pad but that didn't help, the pad was sitting at an angle and i think it was the back plate that was slightly out, bit the bullet and bought some quality blueprint pads and problem solved, just comparing the 2 makes is like night and day, you just have to look at the blueprints to see they are in a different league to nipparts quality wise.

buy cheap buy twice

going to replace the fronts with blueprints once the mot is done and i get paid, just don't trust them now.

when i had the last Celica i wouldn't have thought of putting cheaper brakes on but with a house and wife to be now im not allowed to spend what i used to , so, it wasn't my fault it was Jans. Always blame the woman :lol:

Kev

Sucks that you had to figure out the hard way. But i guess.... buy cheap buy twice is true than for everything really.