I have the same situation, except intermittant. Good boost first time on the brakes (i.e., in stop & go traffic) then suddenly hard pedal and less stopping power.
Shall follow that link's suggestions after work and see what I find. On 8/26/05, Marshall Booth <[EMAIL PROTECTED]> wrote: > > Alan Duff wrote: > > Just bought a 83 300D. The brake pedal is rock hard and only moves down > a > > quarter inch or so and the car is slow to stop. The brakes don't seem to > > drag. Don't recall having this type of problem before. My thoughts are > > 1. Stuck piston in a brake caliper > > 2. Stuck master cylinder. > > Any ideas? > > The vacuum brake booster is NOT working. Usually the problem isn't the > booster but the vacuum supply to the booster - often a leak, > occasionally the vacuum pump. > > First test. With engine off, and foot pressing on the brake pedal, start > the engine. The pedal should drop about 1/2" and feel "softer" as vacuum > builds over a few seconds. If it doesn't the the booster isn't working. > If the engine stops when you turn off the key, there is at least SOME > vacuum (as the shutoff valve is vacuum operated) and I'd start to > investigate the line from the vacuum pump to the brake booster. > > It gets more complicated from there depending on what you find. > > Check this link: > http://skinnerbox.steaky.org/Service/W123/Index/Groups/43BrakeBooster.htm > > Marshall > -- > Marshall Booth (who doesn't respond to unsigned questions) > "der Dieseling Doktor" [EMAIL PROTECTED] > '87 300TD 181Kmi,'87 190D 2.5 199Kmi, '84 190D 2.2 227Kmi, '85 190D 2.0 > 159Kmi, '87 190D 2.5 turbo 234kmi > Diesel Technical Advisor MBCA, member GWSection > http://www.dhc.net/~pmhack/mercedes/mbooth1.htm > > > _______________________________________ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://striplin.net/mailman/listinfo/mercedes_striplin.net > -- 1977 240D 1972 Honda CB-500K motorcycle If we couldn't laugh we would all go insane.
