Rear Brake Useless

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Rear Brake Useless

Post  Mauser on Thu Jul 12, 2018 8:18 pm

As topic, my rear brake is crap, peddle is solid, genuine pads, disc perfect....just doesn't seem to bite ?.
Bit lost really.....caliper and pins perfect it floats like new, piston spotless....polished in fact BRP smile
What else is there ? Frustrated

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Re: Rear Brake Useless

Post  BuRP on Fri Jul 13, 2018 7:53 am

Tried to put brake fluid in the system Maus?
razz

Funny one I agree - pads too old perhaps?
Old pads can get hard over time, and also ingress of shite is just about inevitable - and your cleaning agents spring to mind here, I know you keep things amazingly clean.
If you've got a contact then have the pads milled off say 0.5mm or so (or sand them down yourself with coarse sandpaper), and see if that makes a diff?
Or, if you recognize the above 'cleaning' here, soak the pads in thinners overnight, just dunk them.
Oh, ditto disc then, wash it with thinners, the best stuff to 'refresh' brakes.
If you ever had grease-leaking wheel bearings this may have gotten onto the pads... and I would replace them then, but try the thinner-soaking first.

Mind though, although the brake fluid remark above is a joke (for blondes only, I know you know...), this stuff gets old, and best is to renew it every year. It is very hygroscopic, and if a lot of water is in it (i.e old) then it becomes soggy, 'springy' feel.
And lastly, I've not mentioned bleeding any air - but you say the pedal is hard so I'll shutup now BRP smile
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Re: Rear Brake Useless

Post  Mauser on Fri Jul 13, 2018 10:47 am

lol it's all perfect as you would expect, new Honda pads, disc is OEM and like new I don't use any cleaner liquid on my bikes, new fluid and no air just seems like the brake drags rather than bites....pins are stainless, sliders all greased recently, I don't go much over 30mph as you know just wondering if the pads are made for greater speeds ?.....bit lost to be honest Bananatool

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Re: Rear Brake Useless

Post  BuRP on Mon Jul 16, 2018 9:02 am

AHA, that must be it then: go for a WO-run in 5th, then simultaneously move to the back of the seat & brake with only the rear, just hard enough so that the rear tyre almost wants to lock. Repeat until the pads start to smoke or the disc starts to glow, whatever comes first!

razz
Actually Mauser, that may not be a bad idea to "use" the brake so now & then.
Perhaps keep the pedal down for a short while whilst lugging around?
Such may just remove the bits of green from those green lanes Bump


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Re: Rear Brake Useless

Post  Hew on Mon Jul 16, 2018 7:09 pm

Could be too much polish finding its way onto the pads and disc asking for it

On a serious note with the rear wheel out and the pads removed the piston should move very easily when the rear brake pedal is pressed. It should be easy to leaver the piston back as well to refit the pads.
If all that is ok just fit ebc sintered pads that should give you some bite.
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Re: Rear Brake Useless

Post  Mauser on Tue Jul 17, 2018 7:50 am

Hew wrote:Could be too much polish finding its way onto the pads and disc asking for it

On a serious note with the rear wheel out and the pads removed the piston should move very easily when the rear brake pedal is pressed. It should be easy to leaver the piston back as well to refit the pads.
If all that is ok just fit ebc sintered pads that should give you some bite.

Had the pads out the other day just to clean the dust around the piston and remove some harder crud...Autosol on a small thin strip of rag and it shines lol....it pops in and out easily....I have the old pads I will drop them back in....would be dissapointed if the genuine Honda pads are the problem Frustrated

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Re: Rear Brake Useless

Post  BuRP on Tue Jul 17, 2018 3:56 pm

Hew wrote:Could be too much polish finding its way onto the pads and disc

No Hew, nonono, ol' Mausie ain't that stupid, come on now, that's an insult!
No, I suspect it's his elbow grease, but don't tell it him, the eager polishing beaver that he is Bump


Would like to know if the old one's will cure it Mauser, pls let us know!
I mean, even the big H can drop a thing, and besides, I bet they have them made, perhaps in China these days? razz
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Re: Rear Brake Useless

Post  SkidMark on Wed Aug 22, 2018 10:00 am

Reminds me of a tech help request letter sent into a motorbike magazine once from a guy that had squeaky brakes. He had sprayed them with WD40 and although now he was very happy that the squeakiness had gone his brakes wasn't performing very well now.....

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Re: Rear Brake Useless

Post  BuRP on Wed Aug 22, 2018 1:00 pm

Lol Hew, in that same vain I remember a post from a guy who'd left his bike at his parent's place, and when he picked it up his father had polished the thing - super shiny!
He dropped it when leaving their driveway, for the old geezer had put tyre polish on the hoops also Bump
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Re: Rear Brake Useless

Post  Mauser on Wed Aug 22, 2018 1:38 pm

Still poor as ever I will remove the master cylinder sometime and have a look inside...it's just not right BRP smile

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Re: Rear Brake Useless

Post  Mauser on Wed Aug 22, 2018 10:47 pm

Removed master cylinder tonight; not much appeared @ fault, had a spare body so swapped over the fittings etc and re-fitted....need a test ride to see if it's helped Bananatool

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