73 Brake System

I had notice that the drivers side rear brake had been hanging up and draging, so I took apart the caliper and rebuilt it. When I started to bleed the brakes the rear ones did not bleed only the front calipers would. Is this cause by a bad Master cylinder? or maybe something else.
Ken

Ken, It could be because of a bad master cylinder, but it also could be because of rust blockage in the steel line, or from a defective rubber hose ... at the 'age' of your brake components, many things can be deteriorated, and moisture can reek havok!

I have said this before, but, I strongly recommend blowing out all of your brake lines and complete disassembly and cleaning of master cylinder, and all calipers ... when any problem anywhere in the system is encountered! Then, and only then, are you ready to refill and bleed your brake fluid. I sincerely hope you have a set of flare-nut wrenches for use on all of those old and fragile connections! Proper flushing of fluid out of a caliper requires removal of the caliper from the suspension, and careful draining of all 'old' fluid ... if you are not going to disassemble and rebuild the caliper! A 'typical' bleeding job does not 'change out' about 80% of the fluid below the level of the bleeder nipple!!! When the Porsche owner's manual says the brake fluid should be changed every 2 years, they do NOT mean JUST the fluid in the reservoir and above the bleeder nipples in the four calipers! They mean to drain all of the fluid out of the calipers and CHANGE all of the fluid!

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Warren Hall
1973 911S Targa

[This message has been edited by Early_S_Man (edited 03-13-2000).]