Bleeding rear brake

[yorkylancs]

Ok here goes,rear brake bleeding should be simples yeah? Pump lever,crack bleed nipple let air escape,tighten nipple,release lever and the fluid goes down in the res,all well and good,but the piston doesnt move a bit even after repeating said process a zillion times,is it me or do you lot reckon the pistons seized in the bore? If so i need to get it out,and as it wont push out under hydraulic pressure will be using air pressure,is there any other way.Did think about chucking it in the skip,and getting a cheapy off ebay,on that train of thought is there owt else that would fit,and make a good upgrade? cheers Rick..

[warby221]

If you’re not getting pressure on the lever then it still needs bleeding m8

When you’re getting pressure there should be enough hydraulic force to get the piston out just put a G clamp on opposite piston and force out the sticking one a bit then push it back in a few times till its free

Do the same with the other one just to make sure it’s free and will come out
Pump the pedal holding in one piston at a time till there both just about out then pull them out by hand

[Jonesey]

The rear caliper on the storm is pretty generic across loads of bikes, vtr, sp1,sp2, r1 r6 blah blah. Sounds like you either have a seized piston because of displaced seal, or a lot of air trapped in the rear master cylinder.
Try just 'cracking' the rear banjo 1/4 turn and then press the brake pedal, if there is air trapped it will emerge past the banjo DON'T RELEASE THE PEDAL AGAIN UNTIL YOU HAVE DONE THE BANJO UP!!!!!
Then repeat.
If all fails and it is knackered, I've got 2 black ones and 2 gold ones if your'e interested in a replacement- or send yours to me and I'll sort it for you.
Chris.

[Manxman]

I usually use a syringe and small piece of rubber hose and backbleed. (caliper to master cylinder). I find it a lot easier than pumping.

[sirch345]

Rick,
If you're sure you've got all the air out (as the others have mentioned) and you're getting a resistance at the brake pedal then it does sound like it's seized to me. Try pushing the piston back in a little using a G clamp (you'll need to remove the caliper first), then pump it out again if you can get it moving with the G clamp first.

The standard Firestorm rear caliper is a single piston set-up, it works on a sliding principle, so make sure that part has not seized up while you're overhauling the rest of it.

Chris.

[yorkylancs]

Weird,when i push the piston back in the fluid level rises,the brake pedal pumps it out so far about 8mm,then it wont go any further,there is no fluid leaking from the seal,why it only comes out so far and stops is odd,sack it gonna get a replacement....

[yorkylancs]

Massive thanks to Jonesey[Chris],top bloke,sent me a spare caliper that actually worked,looked like a new piston and was greased up in all the right places,its good that people do still help others out...if i ever meet him its beers all round.
you meet the nicest people on a Honda,or a storm for that matter!