Author Topic: Calipers again  (Read 1431 times)

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Offline James Carter

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Calipers again
« on: November 02, 2014, 15:00:59 PM »
About the 5th time I've stripped this bitch down because of binding. Went surgical today with the dental scraper. Just been out and i think I've finally nailed it, although every time I say that it binds again! Did a good 40 miles though so I hope thats the end of it. Might have been a slight build up of corrosion behind the seal making the pistons a little tight i reckon. Can't see what else it could have been...

And it does accelerate quicker with the front brake off LOL, could have fried chicken on the O/S caliper when i got home on Friday!



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« Last Edit: November 02, 2014, 15:14:47 PM by James Carter »

Offline robvangulik

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Re: Calipers again
« Reply #1 on: November 02, 2014, 17:44:26 PM »
Beneficial for your mileage too.
What helped me, years ago, was just to leave the dustseals out, they are the culprits most of the time.
Lots of older bikes don't even have those from factory, and in my view they're a useless (and bloody irritating) addition to an otherwise good system.....

Offline James Carter

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Calipers again
« Reply #2 on: November 02, 2014, 17:50:27 PM »
Yeah they are out - took them out last year - this issue has been bloody annoying!


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Offline RuaphuNZ

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Calipers again
« Reply #3 on: November 04, 2014, 07:10:17 AM »
James i had similar issues with my last VTR 250, with front brake binding. I done the same thing you did many times. Just about drove me around the bend.

I had the wrong end in view. The master cylinder was causing ALL of the issues. For what ever reason would not allow the oil to return fully meaning the caliper would bind on the disk.

I changed the master cylinder, cured! Never looked back.

I would suggest looking at this too, if in doubt, replace it. A dead give away is disk heat. If they are both dang hot after the issue pops up, hard to believe both are binding, suggests its the master cylinder playing up.

And yeah i binned those dust covers on my CBR too.

I never bothered rekitting it as a replacement was dirt cheap and quicker to do.

Cheers Ando


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« Last Edit: November 04, 2014, 07:14:20 AM by RuaphuNZ »
Laid back, cruising along listening to my wonderful 2.0L Vulcan Vee twin 'thump-thump' all day long, devouring the miles, enjoying life to the fullest, feet first.

Offline robvangulik

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Re: Calipers again
« Reply #4 on: November 04, 2014, 19:21:25 PM »
If Andy is right and the master is the cause, no need to replace it at once.
Fair chance that the tiny return hole in the mc , that should let the fluid return after braking to the reservoir, is clogged up.
Push through it with a sewing needle an try if it works again.....

Offline James Carter

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Calipers again
« Reply #5 on: November 14, 2014, 20:01:31 PM »
Ok - after a few weeks it's still free so it must have been one piston on the offside caliper. I'd read about the master cylinder and that was my next check. Cheers.


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Offline robvangulik

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Re: Calipers again
« Reply #6 on: November 14, 2014, 23:46:49 PM »
Enjoy while the weather is good, november is quite mild  so far....

Offline RuaphuNZ

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Calipers again
« Reply #7 on: November 17, 2014, 08:36:43 AM »
Sweet as, good news eh James. Weather is starting to show signs of summer down here, yippee


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Offline James Carter

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Calipers again
« Reply #8 on: November 17, 2014, 22:14:59 PM »
Enjoy the sun! Going to try and avoid the UK salt this winter...


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Offline RuaphuNZ

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Calipers again
« Reply #9 on: November 20, 2014, 09:28:04 AM »
Yep will do James, cheers eh


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Laid back, cruising along listening to my wonderful 2.0L Vulcan Vee twin 'thump-thump' all day long, devouring the miles, enjoying life to the fullest, feet first.