Brake bleeding

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Brake bleeding

Post by shocker on Sat May 31, 2014 10:04 pm

Had to fit a new brake hose to my WR today due to some nasty looking wear to the old one
Bleeding it is proving to be more of a bastard than usual though!

It won't bleed in the normal (open the nipple/squeeze the lever/lock nipple/ release lever etc) way so tried to 'back bleed' by pushing the fluid from the caliper to the resivour with a syringe with no joy
I squeezed the syringe so hard the pipe popped off the nipple spraying me and the garage with brake fluid before any fluid went up the new hose scratch 

Anyone got any tricks I'm missing??
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Re: Brake bleeding

Post by dai 530 on Sat May 31, 2014 10:07 pm

Make sure you have plenty of free play on the brake lever
if theres any resistance on the piston theres no chance of bleeding it
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Re: Brake bleeding

Post by jams on Sat May 31, 2014 10:10 pm

shocker wrote: so tried to 'back bleed' by pushing the fluid from the caliper to the resivour with a syringe with no joy
I squeezed the syringe so hard the pipe popped off the nipple spraying me and the garage with brake fluid before any fluid went up the new hose scratch 

Anyone got any tricks I'm missing??

Persevere with back bleeding, I had that problem first go. Make sure the nipple is fully loose, 2-3 turns then try. Also try squeezing the brake lever. Works a treat, you need lots of fluid though, make sure its pouring over the top of the reservoir for a while otherwise you will have load of tiny bubbles which could eventually link up to form one big one...then your fucked, no brake!
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Re: Brake bleeding

Post by shocker on Sat May 31, 2014 10:24 pm

Thanks' a lot gents

There was no resistance from the piston before changing the hose, so hopefully there isn't (can't feel any) now, but need to check how much free play is at the lever.
Also only had the nipple open half a turn, so will try it more undone too

Will try both things tomorrow morning - got the hump with it now! Evil or Very Mad
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Re: Brake bleeding

Post by jams on Sat May 31, 2014 11:23 pm

I would place money on it being the nipple thing. Got frustrated with mine too, went back to it in the morning and bled it in 5 mins! if you're a clean freak, you could syphon out the excess from the reservoir, im not so I just let it flow!
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Re: Brake bleeding

Post by shocker on Sun Jun 01, 2014 7:47 am

Took both pieces of advice, and now spot on Very Happy 

Primed it with the syringe - (but opened the nipple right up this time) and fluid went in dead easy, getting rid of the calliper/hose full of air
Adjusted the lever to the max, then bled it properly leaving a nice firm brake

And there was me thinking I was too old a dog for new tricks Smile 

Cheers cheers
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