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#1
06-03-2011, 04:36 AM
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mercedes 1979 450 sel 6.9
This 450 sel 6.9 sat around for 5 years not being driven and has a issue with the brakes not working properly. I actually bled all four using new brake fluid but the brakes pedal still goes down to the the floor quite often. Could it be the brake master cylinder is cactus or could there be some other problem. The level of fluid in the .brake master cylinder does not go down but remains in the max level.
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#2
06-03-2011, 10:34 AM
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Seals probably out on the master or the master itself needs bleeding.
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With best regards Al
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#3
06-03-2011, 05:59 PM
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Cactus?
If the system got very low on fluid you might be lucky and it might just be that the master cylinder needs bleeding. Otherwise it's time to rebuild or replace your master cylinder.
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. 99 Mazda Miata 183,xxx miles.
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#4
06-04-2011, 02:59 AM
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Had the same issue with my car.( it sat for 2 years) Calipers in front wouldn't release. Replaced them and hoses, bled system but lost leverage at the pedal. I disassembled the master and found a rusty bore. Replaced master and all was well.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#5
06-04-2011, 09:08 AM
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On something so old capable of going so fast it makes sense to just replace everything while you're in there.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#6
06-08-2011, 05:12 AM
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Jim,Buy a new master cylinder . Where in Sydney are you?
For more advice visit www.m-100.cc where all things 6.9 can be found including more than a few OZ owners.
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