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#1
09-16-2011, 11:54 AM
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Spongy breaks
Is there any test or way to tell if my master cylinder or brake booster is going bad in my 300e. I drove it to work yesterday and it was fine. When I go to lunch I noticed that it was real spongy. I checked the fluid and it was low. It wasn't empty but pretty low considering how I frequently check my fluids. Any suggestions?
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1972 220d gone lived a good life 1972 280se gone but not forgotten 1978 300D the best i ever had 1977 350se speed racer gone 1995 honda accord lx coupe victim of the growing family 1988 300e gone but not forgotten 
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#2
09-16-2011, 12:24 PM
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A bad booster won't give you spongy brakes. They would just be hard to press. If you are actually losing fluid then you should see some fluid somewhere. Generally sponginess is a symptom of air in the lines so you need to bleed the brakes. I think a leaking master cylinder will slowly sink to the floor as you apply pressure. Also there may be fluid leaking from it maybe from above the brake pedal area.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#3
09-16-2011, 12:38 PM
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How old are your flexible rubber brake lines? I have heard of cases in which small cracks cause a soft pedal, but don't leak enough brake fluid to be noticeable. Replacing these lines every 10 years or so is good practice.
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#4
09-16-2011, 02:49 PM
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As Jim says, check he rubber brake lines. You also should bleed the brakes and see if the pedal hardens. If it does, then you have a leak somewhere that you need to fix.
Flushing brakes thoroughly on annual basis will virtually eliminate hydraulic problems.
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2001 SLK 320 six speed manual 2014 Porsche Cayenne six speed manual Annoy a Liberal, Read the Constitution
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