Hey chaps,

Two weeks ago I was riding down a monster mountain, bike fully loaded with girlfriend on the back. I was using my back brake... a lot.
As i neared the bottom the brake pedal became flimsy and there was absolutely no bite whatsoever and no resistance in the pedal - felt like the spring had been removed. Rather scary, but luckily the front saved the day.
Once they've cooled (30 minutes) they're fine and back to working order

I assumed the pads/ disc overheated and maybe lost its bite because of dirt. I took the calliper off, pads out, inspected, thorough clean and reassembled.

Two weeks on and i'm riding down an even steeper mountain, back brake does it again. 20 minutes to cool off and they work.

I've never experienced this before, complete loss of the brakes due to overheating - if that's what it is.

Can anyone shed any light on this for me please, would be greatly appreciated!

Thanks,

Andy

Basically,as you have said your brake is over heating..

Might be an idea to consider feathering your brakes..using front too.

I would consider changing the fluid too.

Curious as to where your riding?.

Severe use of small disc , small caliper and small fluid reservoir generally results in the fluid being boiled for want of a better description.
Not much you can do about it. I'd definitely change the fluid if I'd had the brakes reach that stage.
Used to tear round on an XR650R SM with the standard front brake which usually ended with an excursion into the boonies, changed to a 320mm rotor, larger caliper and suitable master cylinder and was able to stop when I wanted to.

Thanks chaps!

Okay, so nothing serious, but a brake fluid change is due then.

Was riding in Turkey. Although, just crossed the border into Georgia yesterday!

Appreciate the advice.

Andy

I was thinking 'where the feck are there mountains in Slough'?

Multi storey car parks are pretty steep in Slough.

Hahaha! Sorry, should have explained earlier...

Although, there's a rather steep hill in the Trading Estate... kind off.
Well, it's more of a slope but whatever

Andy

Andy is your email address still valid? Only the software that runs this forum reported in the admin panel that this address is no longer valid.

can you please send me a current valid address in a private message so I can edit it in your profile.

do not, repeat do not write it here in the open public

Thanks

the best brake fluid I have experienced is motul rb600 (660 has got an even better spec) it has excellent longetivity (low moisture absorbtion) and boiling point.

On my R, the OEM pads are carbon ceramic which I find good but they will loose their performance a lot in the situation you described.

You can improve the hot performance by upgrading to sintered but you will increase the wear on the disc.

try using the engine braking & the front brake to reduced the load on the rear brake

Hi all. I�m not sure if this is the right way to post , I�m useless with computers so apologies before hand. I have a 2010 xt660z tenere. And love the thing. But noticed the other day the rear brake was getting excessively hot. Jacked the back end up and didn�t notice any excessive drag at all. Plus brake felt fine. So I started to investigate and replace things. New fluid, didn�t fix problem. New Master internals, didn�t fix problem. New stainless braided hose, didn�t fix problem. New pads, didn�t fix problem, new caliper repair kit which is new seals and slide boots, didn�t fix problem! As you can see I have exhausted a lot of options. Everything was stripped and cleaned and re greased or copper slipper correctly too. I have checked the disc and it seems not to be warped but I have ordered a replacement anyway but I�m not confident this will fix it. I�d greatly appreciate any help or experiences anybody has had with similar problems to try and sort this problem out. Thanks all.