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w124 weak brake when reversing
W124 E 300 D 1995
Brakes are weak when first backing out of driveway. Otherwise, they seem to work pretty well. Fluid is 9 months old. No leaks at the reservoir or master cylinder. Why would the weakness occur only when backing up at only the 1st start of the day? Last edited by Deezl; 09-28-2009 at 10:55 PM. |
#2
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Its normal, its because of the gearing in the tranny. If the idle is lower you wont notice it as much.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#3
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I'd guess that the vacuum has leaked down and has not recovered yet (as in diminished brake boost).
Next time try backing into the driveway, and starting/leaving with the same routine (same amount of time from starting the engine to pulling out of the drive/first brake event). If the brakes feel a similar weakness, it is likely vacuum/boost.
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Gone to the dark side - Jeff |
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Quote:
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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I had the same symptoms of weak brakes when first started and only idled when my vacuum pump was bad (leaking front cover on old type) along with having to rev the engine a little to get it to shut off with the key.
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1991 W124 250D - 130k Miles |
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