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Nissin semi hydraulic front disc sticking

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Nissin semi hydraulic front disc sticking

Postby Dragbart » Sat Apr 25, 2015 5:23 pm

Just been out for a ride and very sluggish pulling away. Realised that front disc was partially on and wouldn't release. I've eased it back a bit in the garage but the wheel isn't spinning freely. Anybody had the same problem ideas?
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Re: Nissin semi hydraulic front disc sticking

Postby Wack » Sat Apr 25, 2015 6:33 pm

Sounds like the caliper needs stripping as corrosion / dirt is not allowing the pistons to return.
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Re: Nissin semi hydraulic front disc sticking

Postby Dragbart » Sat Apr 25, 2015 6:56 pm

Just been out to the garage, all cooled down and wheel spinning freely? I don't get it?
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Re: Nissin semi hydraulic front disc sticking

Postby missing lynx » Sat Apr 25, 2015 8:15 pm

give the caliper a good clean with brake cleaner paying special attention to the pins it floats on than re asemble using copper grease
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Re: Nissin semi hydraulic front disc sticking

Postby Dragbart » Sat Apr 25, 2015 9:40 pm

Is that a difficult job? I'm ok with most things, but not stripped a caliper before
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Re: Nissin semi hydraulic front disc sticking

Postby Wack » Sun Apr 26, 2015 9:19 am

Also check there is free play at the lever, if the cable is too tight it may not allow for fluid expansion when hot.
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Re: Nissin semi hydraulic front disc sticking

Postby drivera » Sun Apr 26, 2015 9:39 am

Unbolt the caliper from the backing plate take the pads out, then CAREFULLY pull the brake lever so as to push the caliper pistons out a bit ( around 5mm ) if there is a line of rust or crap on the pistons clean off with clean brake fluid ( don't use anything else ) you can use a cotton bud or something similar , then push the pistons back in by hand , clean the pins and lightly copper slip them then put the pads back in , reassemble then replace the fluid ( if more than a couple of years old ) with new fluid .
Hopefully that should sort the problem out :)
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Re: Nissin semi hydraulic front disc sticking

Postby Dragbart » Fri May 15, 2015 8:42 pm

Thanks to you all for your help. Did the job an hour ago and just been for a start/stop 15 miles and no problems at all. Even temped me to open up my new Muggy 198 set up - wow!! :D
Dragbart
 
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