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#1
07-11-2011, 09:16 AM
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Brakes - occasionally not there
The 90 300D (250D Turbo) has begun to develop a brake issue. 99% of the time the brakes work fine, the other 1% you hit the brake pedal and it starts to go to the floor and the car does not slow forcing a couple panic 'pumps'. Ideas? I need to have this fixed as soon ad possible for safety's sake. Thanks.
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Meek 1977 Volkswagen Golf GTi (sold) 1981 Audi 5000S Turbo (sold) 1982 Volkswagen Rabbit LS 145k (sold) 1983 Volkswagen Rabbit GTi 150k (sold) 1984 Saab 900 150k (sold) 1984 Volkswagen Scirocco GTX 1.8T 20V 1985 Mercedes Benz 190E 2.0 160k(sold) 1986 Mercedes Benz 190E 2.3-16 188k (sold) 1988 Volkswagen Fox 161K (sold) 1990 BMW 525td (Sold) 1990 Mercedes Benz 300D 100k 1994 Saab 900 SE Turbo 55k (sold) 1996 Volvo 855R 140K 2001 VW Jetta Wolfsburg 16k (sold) 
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#2
07-11-2011, 01:06 PM
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Most likely the master cylinder is by passing fluid internally. My vote is to replace the master cylinder.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#3
07-12-2011, 12:07 AM
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Since that is a diesel, you should probably post and search on the diesel forum. Diesel's don't make any vacuum so they have a vacuum pump I think. That could be the problem. They can probably answer better on the diesel forum.
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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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#4
07-12-2011, 05:59 AM
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X 2
For Carnut's MC suggestion.
Also, unless replaced previously,your Brake Hoses MAY be approaching their useful Safe End-of-Lifespan.
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'84 300SD sold 124.128
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#5
07-12-2011, 12:22 PM
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Had this problem one. One of my calipers was frozen, causing a drag on the brakes and heating the fluid to boiling. Once the brake fluid boils, you have no brakes.
Possible causes:
Check each caliper for frozen pistons and replace all rubber brake hoses. Also, brake fluid should be replaced every two years. Brake fluid is hygroscopic and with time its boiling point drops. Also, the water in the fluid promotes corrosion/rust which will tend to freeze the piston in place. New brake fluid's boiling point is higher and you have a slightly higher margin of safety in case of a dragging brake.
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1986 300E (3/2002) Rear ended and totaled (10/2009) 2000 Xterra (5/2000) 1992 400E (11/2009) -Sold 1986 300E (12/2009) - Sold 2004 E500 Wagon (6/2013) - Sold 
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#6
07-12-2011, 09:16 PM
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first thoughts is master cylinder.. had a bad MC on a Isuzu Trooper once>> had to pump like a mofo to get it stopped ....
if it is a dragging caliper - you can tell by ascertaining how well the car coasts - put it in neutral coming up to a light - is there any drag? binding? bad noise?
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Kim Langley 97 C-230 80 911 SC 73 2002Tii
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