pin seized on rear caliper

[Guest]

trying to get my rear pads out as they are fooked, allen pin holding the pads in is not budging i have really tried giving it some oomph and it is not moving, what can i do lol ?

[Stu]

soak it in WD40 apply some heat use an impact gun apply more heat and WD40

it will come out just be patient

if you do heat it up change the brake fluid once sorted and dont heat it too much you only need to heat it a little

[megawatt]

A combination of heat and freeze spray, combined with turning the pin will eventually loosen it.

[Stu]

also try to tighten it a little too this an also free it off

oh and grow some muscles

[Guest]

lol at muscles comment, i tried a bigger ratchet come loose on the third attempt thanks

[Colin the Bear]

NB WD40 is not a good penetrating oil. It's great at what it does do, but there are better specific penetrating oils with all sorts of additives that will save you from shearing bolts and stripping heads and skinning knuckles. A tin in the toolbox or shed will come in handy for years.

[Tango]

Yeah...I used to use PlusGas or something like that....worked really well.

Replace the pin if I were you.....and a little bit of copper grease on it on reassembly, just a smear though not big lumps of it.....

[Ingah]

Yeah...I used to use PlusGas or something like that....worked really well.

Replace the pin if I were you.....and a little bit of copper grease on it on reassembly, just a smear though not big lumps of it.....

+1.

[Guest]

right eab said to me i need to take the caliper of the mount and clean the bolts as they have rusted, just looked at the caliper and i canot see how it comes of, there is a rubber cup over one bolt but i cannot get the thing of, iv tried taking a spanner to the nut on the bolt but again it wont budge, not even sure what im doing is right, does that rubber cup come of with access to a bolt or does it come of by loosening that nut ?

http://img801.imageshack.us/img801/4715/p1050862t.th.jpg

http://img839.imageshack.us/img839/518/p1050863v.th.jpg

http://img695.imageshack.us/img695/5147/p1050864rr.jpg

i know the caliper is dirty im half way through cleaning it thats why it looks bad

[Colin the Bear]

At this point I'd be looking in the manual.

Bike?

[Guest]

Honda cbr125 dont have a haynes and the manual doesent say anything about taking the brakes apart

[Stu]

have you tried just sliding the caliper off the pins?

the pics arent very clear

[Guest]

nope its bolted on solid and not moving, i tried again loosening that nut on the bottom but its not moving, il try get some better pics

[Stu]

that caliper should not be solid!!!

it is on slides it has to be with it been a single pot

it could be seized up on the pins!!

if it was bolted solid only one side of the brake would act on the disc (piston side) as thats the only place it would move

[Guest]

im confused now tbh the whole mount slides of but i need to seperate the mount from the caliper ?

http://img843.imageshack.us/img843/9374/p1050869g.jpg

http://img21.imageshack.us/img21/3797/p1050868z.jpg

http://img21.imageshack.us/img21/5011/p1050867x.jpg

http://img829.imageshack.us/img829/7572/p1050866mx.jpg

[Stu]

i would remove that bolt

http://img21.imageshack.us/img21/5011/p1050867x.jpg

[Guest]

il give it a go now but it was on bloomin tight when i tried before

[Stu]

see other post

re muscles

[Guest]

yeah lol i got the nut of then the plate wasent budging so tapped it with a hammer and off it came

cheers stu

[Stu]

no worries

sounds like its slightly seized too so make sure you clean it all up properly and then use grease on the slides for the caliper

[Guest]

yeh all cleaned up now, first pad change and the bikes done 13600 so was expecting it to be a bit dirty/seized, new pads this afternoon, get my new tyre fitted and take it for a test ride

[Guest]

new pads wont go in piston is to far out tried pushing it in and its not moving, please dont say iv got to strip the brakes down

[Colin the Bear]

In several other threads it has been suggested to remove the master cylinder lid, to facilitate the back flow of fluid, and to use a g clamp with a piece of wood to wind the piston in and protect the caliper.

[Guest]

managed to get the piston back in but took the bike out and it feels like the back brake is on all the time, stopped at the side of the road and the rear disc is hot to the touch, serious binding going on, not happy

[Tango]

You could also use the old pads to protect the pistons as you push them back in. Remove the cap from the brake fluid reservoir and tie some rag around the reservoir so that any fluid overflowing doesn't get on anything else.....then with some thing to protect the pistons (ie the old pads) lever the pistons back in.