seized caliper or clogged brake line?

[m3f_fun2drive5_6e12f48401]

I think you still have a brake line issue. Collapsing I have never seen but swelling I have seen a lot and I would guess if the brake line is compromised it will cause an issue.

If you have ruled out all other causes such as caliper, rotor, pad than what else is left...brake line

[m3f_Porschetec_b3046e5dde]

so whats teh verdict?........have ya still got a problem? btw its not that uncommon to have a collapsed brake flexy hose. i've seen quite a few in my time

[m3f_M///Fanatic]

Seeing as how when you opened the valve and release pressure the rotor turned, I'm thinking it's the line.



If fluid comes out when the bleed valve is open and the peddle is pressed, it's not the line. Pretty simple test.



You could always pull the caliper off and see if it's stuck. You should be able to push the piston back into the housing pretty easily (using a C clamp) without opening the bleed valve.



If I am not able to push the piston back into the housing do you suggest I get a new caliper?

[m3f_WRXEATR_c6f1d80be6]

If I am not able to push the piston back into the housing do you suggest I get a new caliper?



Depends, would you rather spend 150$ on a caliper or 20 on some rebuild kits?

[m3f_OahuMPower_17503f01cd]

If I am not able to push the piston back into the housing do you suggest I get a new caliper?



1) are you doing this on the car?



2) did u ever take apart the caliper?



3) how are you trying to push the piston back into the caliper?

[m3f_M///Fanatic]

1) are you doing this on the car?


2) did u ever take apart the caliper?


3) how are you trying to push the piston back into the caliper?


1) Yes, I unbolted the caliper and opened the bleeder bolt and attempted to compress with a c clamp.

2) Not completely no.

3) With a c clamp

[m3f_epj3_d2e882815a]

If it doesn't pull when driving or braking.... It could possibly be the guide bushings.



I rebuilt all four of my calipers, put on new pads and rotors, and they started squeeling terribly after bed-in. I couldn't figure it out until looked and saw that the pad was only touching the outside edges of the rotor... Just ordered some solid guide bushings from TMS, if that doesn't do the trick, I'm getting a BBK, but I doubt that these won't fix my issue.



If they aren't touching using the stock guides, the solid guide bushings will only make it worse. Did you use new pads after the rebuild? Likely the pad material had wear patterns from before the rebuild. When I went from solid guide bushings back to stock, my brakes squealed for at least 4 months.

[m3f_WRXEATR_c6f1d80be6]

1) Yes, I unbolted the caliper and opened the bleeder bolt and attempted to compress with a c clamp.

2) Not completely no.

3) With a c clamp



If you cannot get the piston in with a C clamp with the bleeder even open, something is seized up pretty bad. Your piston seal may have rolled over or you may just have some bad corrosion in there. I would advise to pull the calipers and rebuild them. If the pistons have ANY corrosion on them at all, get some new SS ones.

[m3f_Braymond14_63960d99c1]

If you cannot get the piston in with a C clamp with the bleeder even open, something is seized up pretty bad. Your piston seal may have rolled over or you may just have some bad corrosion in there. I would advise to pull the calipers and rebuild them. If the pistons have ANY corrosion on them at all, get some new SS ones.



Agree with this and I'm betting it's heavily rusted given the location.



Who is supplying replacement pistons other than BMW currently?

[m3f_WRXEATR_c6f1d80be6]

Agree with this and I'm betting it's heavily rusted given the location.


Who is supplying replacement pistons other than BMW currently?


For the stainless, they are made by a company I believe that goes by the name of Stomskie Racing


http://store.bimmerworld.com/stainless-steel-brake-caliper-pistons-p755.aspx


Who is supplying replacement pistons other than BMW currently?


....and how do I get my hands on some of these BMW supplied pistons? :bow:


I wasn't aware they were available