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#1
09-10-2007, 11:33 PM
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Strange brake behavior
While driving the '85 this evening I noticed my brake warning light had come on, then when I applied the brakes they felt softer than usual but still worked. As I continued to drive (using the transmission to slow down) the light began to dim, then went out and the brakes seemed to return to normal as well. I got home and checked the fluid, but it is full to the max mark (although a bit dirty, I need to flush the system). Anybody have any idea what is going on?
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine 
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#2
09-11-2007, 12:05 AM
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When that happened on my 240D manual, the rear chamber on my master cylinder was low and I had a leak from my clutch master cylinder. Are you sure the fluid level is full?
Kevin 1979 240D manual 1978 300D
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#3
09-11-2007, 01:03 AM
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Yes. Both chambers are full. I did notice that the front "float" seemed to be too low and sticky. Could it have been blocking the front of the MC?
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#4
09-11-2007, 01:11 AM
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A soft pedal that goes away could mean you were boiling the brake fluid in the calipers if you were using the brakes frequently.
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#5
09-11-2007, 01:15 AM
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I'd check the brake pads. The sensors are kicking in.
__________________
1983 123.133 California - GreaseCar Veg System 
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#6
09-11-2007, 01:22 AM
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This brake fluid is fairly old, if it has absorbed water would it boil much more easily? I was using the brakes some, but not excessively, not like I was going down a mountain or anything.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#7
09-11-2007, 01:19 PM
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yes. water boils at 100C, brake fluid boils at around 280C do a nice pressure flush, or at least a good long gravity bleed job.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
09-11-2007, 03:54 PM
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Quote:
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#9
09-11-2007, 04:49 PM
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Quote:
__________________
83 SD 84 CD
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#10
09-11-2007, 11:06 PM
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Yellow light. Untill today I thought it was the warning light for both pads and fluid.
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#11
09-12-2007, 10:21 PM
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So what kind of pads do you guys like? The rotors look OK, no deep ridges. Should I replace, reface or leave them alone?
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#12
09-12-2007, 10:56 PM
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Quote:
__________________
83 SD 84 CD
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#13
09-13-2007, 02:23 AM
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PBR Deluxe. My hands down favorite. Work great and has low dust.
Always better to have your disk resurfaced or replaced but with the condition you stated and as long they are not pulsating, then you should be OK just replacing the pads.
__________________
1983 123.133 California - GreaseCar Veg System
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