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  #16  
Old 05-06-2007, 07:55 PM
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Location: queens- new york
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hard pedal braking symptoms on my 82 3oo sd - brake fluid reservoir checking from the outside full to the top -
rear brake reservoir which cannot be checked from the outside
- empty -
filling up the rear brake reservoir = problem solved .
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  #17  
Old 05-06-2007, 09:38 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
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glazed pads or non flat/smooth rotors could cause it.

also what booster is it? different brand behave differently. girling ate and bendix have different "power?" curves based on applied pressure. Its in the fsm somewhere. if they arent the same boosters you are comparing apples and oranges. 2 of the brands have the same curve i forget which ones.
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  #18  
Old 05-07-2007, 10:42 AM
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Quote:
Originally Posted by Brian Carlton View Post
I don't believe that thin rotors would cause a hard pedal. The capability of the vehicle to stop under heavy braking loads is compromised because the thin rotor won't be able to handle the heat........but........it should not create the symptom of a hard pedal under normal driving conditions.
I agree that it is a long shot, but thin pads combined with thin beyond spec rotors, could cause the caliper piston to extend beyond normal travel, and who knows? just throwing out ideas to check. I like the idea of the rear resivoir checking too.
more than likely, there is a booster problem though. even glazed pads at low speeds should not result in hard pedal.
John
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"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:
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1987 190D 2.5Turbo
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  #19  
Old 06-01-2007, 12:42 PM
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Replaced the front brake pads and solved the problem. They were quite worn. Perhaps an 1/8" left on the thinnest one.
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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  #20  
Old 06-01-2007, 12:45 PM
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how did the rotors look? that much wear on the pads, may have worn the rotor too. be sure and measure it's thickness and be sure it's within tolerances.
John
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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #21  
Old 06-01-2007, 12:48 PM
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Quote:
Originally Posted by vstech View Post
how did the rotors look? that much wear on the pads, may have worn the rotor too. be sure and measure it's thickness and be sure it's within tolerances.
John
Rotors looked fine so I didn't check them. Only 77k miles on the car.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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