- Terrifying brake fade (SLX, brand new)
I’ve just fitted a set of brand new SLX brakes. First ride out yesterday, and after an initial great start (lots of power, good modulation) on the second descent of the day the rear started to fade a bit (ie pulled back with no power, pumping the lever made it work ok) and by the last descent I pulled both brakes hard and they just pulled to the bar – nothing. Again fortunately pumping them got some power back and slowed me down.
I’m fairly heavy (around 85 kg) and I was cracking on (last descent was Gores in the Peak down to the reservoir if anyone knows it) but I wasn’t brake dragging much if at all.
Just in need of a bleed or something more sinister? I need to shorten the hoses so bleeding is no problem.
Running UberBike sintered pads if that makes any difference.Posted 4 years agoamediasMember
(ie pulled back with no power, pumping the lever made it work ok) and by the last descent I pulled both brakes hard and they just pulled to the bar – nothing. Again fortunately pumping them got some power back and slowed me down.
^ thats not really fade, that’s a fluid/bleed issue.
It sounds like you have air in the system somewhere, get it properly bled and it should be fine.Posted 4 years agoJonEdwardsMember
What state were the pads in post-ride? Given what the ground conditions would be like round there, it would be entirely possible (IME) for cheap non-OE and/or soft compound pads to simply disintegrate, leading to a similar sensation.
Does sound more like a bleed issue though…Posted 4 years ago
Pads were ok – plenty of meat left both front and rear, that was my first thought. But it was only a short 11 mile ride and the problem started after the first descent so even with organic pads I’d not expect them to die *that* quickly and sintered ones tend to last a bit longer.
If it was a 30 mile ride with lots of brake dragging then I reckon it’d be almost a guaranteed answer!Posted 4 years agogelertSubscriber
A mini bleed will sort this. Just the funnel on the leaver bleed port, some oil in the funnel and pull the plunger out and put it back several times until bubbles stop coming up and press the leaver several times too. The plunger acts as a bubble puller and the oil switches places with each bubble. Dead easy quick fix in 5 minutes. If you get discoloured oil coming up though… full flush bleed time.
My XT rear feels like this after being left hanging vertically for a couple of weeks after a race and that probably made some trapped air come up to the leaver so when I went out for a quick spin it felt crap and needed pumping a bit to work. It’ll be back to normal when I get a minute to do this little trick.
GMBN video on Shimano Brake Bleed has this trick mentioned at the very end. Worth a watch.Posted 4 years ago
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