PeachParts Mercedes-Benz Forum - View Single Post - Newbie Brake Question

dmorrison · #3 05-08-2007, 09:26 PM

Ok. In doing this job you WILL spill brake fluid so plan for it. Get a turkey baster ( stealing your wifes is not acceptable, buy a new on e give it to her and then ask for the old one.) Tools you will need are a set of metric flare wrenches. A regular set of metric wrenches. A plastic sheet ( a garbage bag is good ). The new Oring ( which is flat ). Some new brake fluid DOT3.
Consider painting under the booster Master Cylinder (MC) with POR15 or any polyurethane paint for future brake system leaks.
Place the garbage bag under the MC and booster. Tape it in position so it does not move.
Using the turkey baster remove as much of the brake fluid as possible. Disconnect the hard lines with the flare wrenches ( normal threads "lefty lousy") some fluid will drip.
After they are removed, remove the 2 bolts holding the MC to the booster.
Carefully pull the MC away form the booster and try not to spill any brake fluid. ( placing the cover on the MC reservoir is a good idea) remove and replace the Oring. Now I would consider replacing the orings between the MC and the reservoir. They do get old and leak. You of course will need a new set. To do this you slowly rock the reservoir left and right while pulling it up off the MC. Don' be to hard on the plastic reservoir. Then when off insert the new orings and lubricate the orings with brake fluid and press the reservoir back in the way you took it out. Slowly rocking it and pressing into position.
Reinstall the MC with the new Oring and attach the hard lines. I would bleed the system to get any possible air out and to change the fluid out. You should change your brake fluid at least ever 3 years if not sooner.

If you need instructions on bleeding the brakes let us know

Dave