I just put on a new master cylinder a few months back hoping to fix the problem I am currently having. see my rear breaks seem to not be retracting back into place causing them to heat up and smoke the driver side seems to be worse than the passenger side could it potentially be the rabs/proportioning valve or can it be something else
SOURCE: Rear disc brakes freezing up
Master cylinder may be bad or most likley air in the lines---bleed the brakes.
SOURCE: Replacing a RABS Valve
In order to bleed the RABS there is a special tool that plugs into the connector of the RABS and holds the solenoids open to facilitate bleeding, you will need to take it to a brake specialists that has a tool to do this.
SOURCE: PROPORTIONAL VALVE ON MASTER CYLINDER LEAKING
it is not a dealer item is should come on the master if you buy a new one not a rebuilt some rebuilts have them
SOURCE: ford fivehundredright rear brake caliper wont retract
Is this the ratcheting style caliper? If so, you really should be using the proper tool to turn these style calipers back into their bore, and both calipers should turn clockwise to retract them back in. Also, if the piston was too far out you may have a hard time getting it to go back in. Hope this helps.
SOURCE: 2005 f150 spongy brakes
it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help
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