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Without a doubt, your brakes are one of the most important systems on the car. While brake boosters do not often fail, when they do, you must replace them as there is no way to repair it. If you have been “topping up“ the fluid level in the reservoir and cannot find where the fluid has been going there is a good chance that it has been leaking out the back of the master cylinder and into the brake booster. Replacing the brake booster on the Mercedes W123 is not difficult, it is just a tight fit. It should take no more than four hours including bleeding the brakes. While you can replace the booster without draining the brake fluid by leaving the master cylinder and reservoir intact, I recommend removing both as there is a gasket on the rear of the master that you must replace. Plus if you are replacing the booster now is a really good time to flush and bleed your brake system. You will also need to remove the kick panels to get access to the pedal box. If you open the brake lines, when
