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#1
09-23-2008, 07:57 PM
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84 300sd brakes weak for 1st minute don't work
I have a 1984 300sd and the brakes are really bad when I first start the car or when then car idles for a while. Once I start driving everything is fine but when I first start the car it's hard to stop when I start moving. I press the pedal hard but it still moves.
I slam on the brakes but it's like I don't have power brakes. I think this may be some kind of vacuum leak but I don't know what I should check. The door locks work fine but I've noticed the car is not turning off when I turn off the car and take out the key. I'm not sure if the car turn off problems and the brake problems are related or not. Any advice would be greatly appreciated. Thanks. Pete 
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#2
09-23-2008, 08:00 PM
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__________________
91 350SD 14 F150 Eco 19 Fusion Hybrid 11 GT500
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#3
09-23-2008, 10:22 PM
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Vacuum problem somewhere. You need to get a MityVac and do some testing. Could be a weak pump, bad brake booster, large leak somewhere in the system.
The increased rpm's are creating more vacuum overcoming the problem. It will probably slowly get worse.
__________________
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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#4
09-23-2008, 11:59 PM
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the central locking system on the 300SD has it's own pump in the trunk. It supplies vacum for the locking system only. The vacum pump on the engine supplies vacum for the brakes, engine control, and hvac system. From what you describe, I'd look at either the brake booster or the Vacum pump iteself. Did I miss how many miles on the 'ol girl?
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#5
09-24-2008, 07:12 PM
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you can test the brake booster but I suspect the check valve in the line going to it is leaking down.
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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