We restored the rear brakes with new cyl and bled the system.The brakes works fine BUT the pedal slowly sinks and you have to brake again.No leaks front/rear. My question: Could it be the mastercyl? Worn out inside? It`s Power Drum brakes. 1968 GS 400 Conv.
Yes, could be master cylinder. It could also be air in the system. Try bleeding it again. http://www.rockauto.com/en/catalog/...379741,brake+&+wheel+hub,master+cylinder,1836 http://www.rockauto.com/en/moreinfo.php?pk=1612998&cc=1379741&jsn=433
Okey,will bleed again. If it is the master cyl,Centric # 13062024? The rest is for manual or disc brake in front?
what happens is the plunger in the master only travels an inch or so in normal use. a ridge forms within the bore and when you're bleeding you force the pucks past that ridge and they tear. very common. it seems aluminum master cylinders suffer more from this. when i do a brake job and pump the pedal up to seat the pads i won't push the pedal more than the normal travel amount. that eliminates the risk