Rm 250 rear brake keeps locking up
Posted 30 June 2012 - 09:33 PM
Posted 04 July 2012 - 06:11 PM
Posted 05 July 2012 - 04:37 PM
That small hole is the MC plunger fill hole and it's also an excape for the fluid as it heats up. If that wasn't cleared as the fluid heats up the expanding fluid has no other place to go than to expand the caliper piston into the disk.
If it was mostly blocked before and you did in fact clear it out then you may very well have fixed your problem.
Posted 08 July 2012 - 10:57 AM
Posted 09 July 2012 - 09:18 AM
Other things that can cause that are collapsed line and messed up caliper pistons.
Easy to diagnose. When the brake system locks, crack the bleeder on the caliper, if the brakes return the caliper is fine. Lock it up again and crack open the banjo fitting holding the line to the MC, if the brake caliper returns, the line and caliper are good. Last, (like you did), clean out the bleed hole in the MC. If brakes still malfunction then rebuild the MC.