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#1
12-05-2008, 12:25 PM
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Moms 88' 560 SL has a leak at the brake booster
Not sure what protocol is but there is a leak between the booster and the metal apparatus that holds the reservoir to the booster. Her brake light is coming on and the fluid is near the min mark.
Is this a rebuild or do parts need to be replaced? Thanks! Doug
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6 
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#2
12-05-2008, 07:39 PM
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Alright I am going to replace the master cylinder. Looks pretty straight forward but as always would love some tips or advise.
TIA Doug
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6
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#3
12-05-2008, 07:42 PM
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Read up on doing this job if you've never done one before.
Get a bleeder kit. Bleed the hell out of it after you put the master cylinder on. Perhaps you want to bench bleed the master cylinder before you put it in. Replace ALL the brake fluid. Test drive it very slowly and make sure your cable brake works before your first test drive. Good luck -tp
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#4
12-05-2008, 07:47 PM
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Quote:
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To see my 129 parts for sale visit: John Roncallo
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#5
12-08-2008, 05:20 PM
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Quote:
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6
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#6
12-08-2008, 08:56 PM
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Do you actually see fluid leaking out right there or is that where you think its leaking?
__________________
 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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#7
12-08-2008, 10:20 PM
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Quote:
__________________
1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6
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#8
12-09-2008, 09:52 AM
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It would be very wise to replace the seal too.
Len
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#9
12-09-2008, 08:17 PM
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Yes, it can cause a vacuum leak otherwise. Cheap insurance to replace it now.
__________________
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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#10
12-10-2008, 07:32 PM
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I would also replace the reservoir. I have had a couple of situations where I installed a new master cylinder only to find that the seals on the reservoir leaked when I put the power bleeder on. And chances are, that no matter how careful you are, you will break one of the the bottom fittings removing it from the master cylinder.
In any case, replace the seals between the master and the reservoir.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#11
12-11-2008, 06:46 PM
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You also want to consider flushing out the booster, if fluid leaked into the cavity.
Otherwise, the the brake fluid can cause the booster to fail. Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#12
12-11-2008, 08:20 PM
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Quote:
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Question Authority before it Questions you.
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