‘82 Diesel Suburban: new master cylinder
The brake master cylinder on my wife’s ‘82 4x4 diesel suburban was starting to go bad. The brake pedal would sometimes slowly sink down when you were stopped at a light. I like to stopper the lines when I disconnect them (to keep out dirt and air), in the pic below I have used some plugs that are actually made for transmission cooler lines, but work well here.
Here’s the new one (not rebuilt, new was only $10 more) bolted on.
The instructions always say to “bench bleed” the master cylinder in vise, using a screwdriver for a plunger. I say, the hell with that, just bolt it up and run the hoses back into the resevoir. Then you can work the air out by pumping the pedal (slowly). By the way, the plastic adaptors and hoses didn’t come with the new master cylinder, I had saved them from a previous one (in fact, the last one I bought didn’t have them either, a disapointing trend).
