Hope M4 rear brake problem
Were you dragging the brake? If so, it’s likely that you’ve boiled the fluid. A good bleed and a tweak of braking technique would sort that.
If you weren’t dragging it, then there’s a very fine leak in the system. Clean and dry the bike. Bleed the brake, then tie the lever back over night. In the morning, go hunting for fluid leaks (a fine talc might help). Or it could be a failed seal in the master cylinder so it’s now not pushing fluid.Posted 4 years agoallthepiesMemberThegman67 wrote:
The brakes are a year old with a 203 rotor. Just back from a week in the Alps
could have been knocked around during transit, check all the lever-hose-caliper junctions. And…. was the bike stored upside down at all during storage/transit ? Fluid can leak out of the reservoir if stored upside down or vertically with bars at bottom.Posted 4 years agoDales_riderMember
Fluid cant leak out if upside down.
Fade is when no mater how hard you pull the brakes don’t work, until you have had it you wont know what it is.
If the levers pull back to the bars and don’t do anything you either have no fluid in the system or air in the fluid, or someones pinched your pads.
Me I’d push the calliper off, the pads out, push the pots right back into the calliper [all 4] and dangle it from the bars.Posted 4 years ago
Get a largish 200 ml syringe and a piece of plastic hose that fits snuggly over the bleed nipple.
Brake lever reservoir level.
Take off top cap.
open bleed nipple and pump all the fluid out. maybe catch it in something using tube mentioned above.
Now fill the syringe and tube with new DOT 5.1 fluid, make sure you purge air out [like the doctors do with a syringe on the tele.
Connect it to the bleed nipple and fill the system from the bottom till the reservoir is full, close the bleed nipple and don’t forget to roll your diaphragm in to the reservoir lid on and your brakes will be sorted.
Check for leaks at some stage.
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