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#1
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Brakes locked up?
I recently replaced the master cylinder and the other day the brakes locked up and were smoking badly. Is it possibly I need to replace the rotors?
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#2
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I had a similar problem a few months ago with one exception. My right front brake locked up, smoking. I had to replace the master cylinder and both front calipers and rotors. The rotor siezed up and they have to be replaced in pairs....ouch!
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81 300D N/A 130K miles (Nelly) 87 300D Turbo 80K miles (The Scalded Dog...because it runs like a scalded dog) 95 e320 Wagon 104K 2003 Sprinter 47K miles. 1999 Tandem Bicycle One beautiful low miles wife (who likes diesels) (that's my wife holding the sign) My son and I fixing Nelly's odometer |
#3
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The only time you really need to replace rotors is when warping occurs or there is to much wear. If there is no warping (wobbles when braking) dont worry about it.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#4
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You probably don't have enough freeplay between the brake pushrod and the master cylinder piston. What is happening is that the master cyl piston isn't coming all the way back to the fluid pressure release port. The pushrod that protrudes from the power brake booster is adjustable. If needed, screw it in some to shorten it. Check first that the brake pedal is returning back ALL the way.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle. |
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mike,
I second what winmutt says. P E H |
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Quote:
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#7
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Clint,
ANd why do the rotors and calipers have to be replaced in pairs? P E H |
#8
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Brake Line Blockage or Frozen Piston
Quote:
You could also have caliper pistons that are frozen in their bore. When is the last time you changed the pads? Did all the pistons push back into their bores without too much resistance?
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Doug 1987 300TD x 3 2005 E320CDI |
#9
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Sometimes a ring of rust and gunk forms around the caliper pistons, I've had 2 friends w/ Dodge pickups this has happened to. Simply popping off the caliper and sanding down the piston freed them. Well, not so simple to get the caliper off since it's hanging on for dear life, but you get the picture.
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'64 230SL |
#10
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If this happens after heavy braking, then it could be that the fluid is contaminated and starts to boil in the caliper. It is rare, but it is a possibility. If the brake fluid is DOT3, then it is hygroscopic in nature, and if it has absorbed a lot of water over time, then the boiling point will be reduced. I don't believe that calipers need to be replaced in pairs, but that seems to be the current mode of thinking. I believe that the logic is that if one goes bad, that the other isn't far behind. When doing brake service, the best thing is to do it well, because unlike bad engine maintenance that will leave you stranded on the side of the road, bad brakes might leave you in the middle of a tree... Do it once..... do it right.
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#11
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Quote:
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#12
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OOPS. I meant to quote miketaco.
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Doug 1987 300TD x 3 2005 E320CDI |
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