usdmftw

iTrader: (2)

got a problem with my front brakes. i just installed new rotors and pads and noticed that the pads did not look like the were depressing on center of rotor. after removing caliper it appeared that the piston was not emerging from caliper straight. intailly thought was caliper but when checked pass. side same thing. could it be something other than caliper? BMC or prop valve? did i just have bad luck and both front calipers went out or could something else cause? here is pics, lmk what you think, thx\

Bad_dude

When you did the brake service did you lube the slide pins really good? That rust brown area, is it happening on both sides of the rotor and on all 4 sides of the both rotors? It looks like uneven brake pads contact to the rotors. When you put on the new rotors, did you spray brake cleaner on the rotor surfaces before installation? Brand of brake pads you are using?

mitchk90

Looks like a slider problem. Did you happen to lose any fluid while doing your brakes.

usdmftw

iTrader: (2)

yes it happens on all 4 sides, i did not lube the slide pins either, or clean with brake parts cleaner. the slide pins are what the caliper monting bolts go in right? wagner brake pads, advance auto rotors, rusty from sitting couple weeks while i replace other front end parts(pretty much all parts). and actually i remember my gf saying the brakes were scrubing few months ago so i did a pad swap and they were jack all to hell, crooked and uneven, after that had bad vibration(warped rotor i thought) so then i got new rotors and pads(current set). so should i pull the slide pins and try to spray all down with brake cleaner? thx for replys

lazlong

The piston should come out straight. If both calipers are doing that then they've both been going bad for a while. Recommend a caliper re-build. If you have compressed air you can do it yourself by removing the caliper and blowing compressed air thru the brake line port. *ONLY DO THIS WITH THE CALIPER FACE-DOWN* You'd be amazed how far that piston will fly, I saw one imbedded in the ceiling one time.

Also, it would be a good idea to measure the rotors to be sure they aren't uneven.

Don't forget to grease the slide pins. I just use the tub-o-bearing grease I have laying around, never had a problem.

usdmftw

iTrader: (2)

yes i have compressor, i should remove the caliper and try to depress with it no on to see if piston comes out crooked or if its something keeping it from dressing pad straight.

lazlong

Seriously, you gotta use better syntax. It's hard to understand you.

The gasket around the piston wears down and allows dirt and grime to enter, eventually making the piston seize. Take the piston out and inspect everything. If it looks too worn replace the whole caliper. If not, re-build it.

These guys are just asking for face full of piston but, you get the idea:
http://www.youtube.com/watch?v=oN0zCcRgSxQ

Almost forgot: Put a piece of wood in there so you don't ruin the piston banging it against the other side of the piston.

usdmftw

iTrader: (2)

sorry was watching tv while posting. what i meant is should i try to remove the caliper and depress brake pad to see if the piston comes out crooked by itself, or if its the caliper bracket or slide pins causing it to be uneven? and yes i have a air compressor to rebuild them if needed. from your exp. is this something def. wrong with caliper causing the piston to emerge crooked or could it be the mounting hardware/bracket or anything else? thx for replys

lazlong

This pic is what makes me think it needs a re-build. It shouldn't be crooked. Re-build it, get new slide pins and slide pin boots, grease the slide pins, put it all back together. It should last the rest of the life of the vehicle

usdmftw

iTrader: (2)

alright thx

usdmftw

iTrader: (2)

i pulled it apart again today. the slide pin move freely and do not seems to be stuck or even hard to move and the boots are in good shape also with no cracking. so would i be ok to just clean and lube them instead of replacing? plan on going tomorrow to get caliper repair kit and don't have extra cash to spend right now if not absolutely needed.

lazlong

If they slide fine and the boots are good then just get the re-build kit.

jdmcertified909

oh dont replace the caliper yet. i had this same problem it took me 4 new

calipers until i found the problem. http://www.autozone.com/autozone/par...22_1770%2C4299 your pins look

like that right? or is something missing on your pins? and are you sure your

putting the pins in the right order. if you notice on the bolt side of the pin

there is f and g on each side right? on the caliper it tells you where it goes.

you have to put them in there right place or else it wont brake right. i also

experienced a mushy pedal felt like i had air in the system. and if your pins

are exaclty the same as in the pic with nothing extra on it. one of the pins is

suppose to have a rubber seal on it thats y it has a grove on it the seal

looks like this http://www.autozone.com/autozone/par...%2C2805%2C4299 also

new boots wouldnt hurt. its cheap anyways way cheaper then buying two

calipers and rotor for uneven wear. and worth a try.

and if those seals are missing guess where youll find them. inside the caliper

mount pin holes. i took of my mount to find them its bolted to the hub i

believe. i also believe its two size 17 bolts. i cleaned inside the pin holes with

carb cleaner to get old grease out and thats where i found them deep down

inside not letting the caliper slide smooth stopping the pins from sliding all

the way causing the piston to slide sideways since pins did not slide all the

way

usdmftw

iTrader: (2)

i will go pull them but mine is the two piece pins, they are pic'd at bottom of link in other customers viewed this. i dont know if mine has the groove in the bottom b/c it shows two different two piece pins. gonna check now, i just bought the caliper repair kit but was only $6 for both sides so no big deal if thats not the issue. but yes my pedal fells spongy also like air but i just thought maybe my master cylinder was on its way out also. was working my way from brakes back up to MC, replacing everything if had to. thx though will look into it. also i have the nissin calipers if that matters. it seems there was two different kind of calipers used on the cb7's

usdmftw

iTrader: (2)

ok i have the two piece slider pins but they are solid, not the one where there is a groove at end of one. also noticed one is 1mm longer than other, longer was on bottom. gonna break out helms and see if says anything about that. pulled calipers apart and they looked good. another note is only have abnormal pad wear on outter part of rotor, inner pad makes full contact. i am just gonna replace the slider pins/boots and all the metal brackets/hardware on caliper at this time just so i leave no stone unturned. thx for the input guys