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Originally Posted by fema
Is there a "test" to determine if the brake master cyl. needs replacement? Or is it just as I've read in the forum, try different things like changing fluids, etc to determine if the low or spongy brake pedal problem is a master cyl or something else?
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Spongy pedal could just be a system that needs to be bled or a bad hose that expands when you press the pedal. I would check those first.
One clear indication of a bad master cylinder is when the pedal slowly sinks to the floor say, at a stoplight. If you're not losing fluid anywhere that usually means a bad master cylinder which coincidentaly, my car is in the shop for right now (luckily I have a warranty since the cost is almost $1200 for the part by itself).
I've seen some weird stuff happen when the abs pump goes bad too.
Low pedal could be a sticky caliper. On cars with drum rear brakes it's usually the back brakes that give the pedal its feel so check their adjustment.
One thing, don't drive on broderline brakes. Besides your own life, you'd be responsible for innocent people as well.