Mercedes 126 Repair – Forgotten about Fluids, Part III

The theme of this document, brake fluid, is not as sorely neglected as differential gear engine oil or power steering fluid. Brakes will eventually command the interest of also the most inattentive owner. But we should be paying attention to our brake system long before it screams at us.

Mercedes is one of the handful of car makers to prescribe a program interval for brake fluid — 2 years. And there are very good arguments for this. To begin with, brake fluid is greatly hygroscopic, readily absorbing water vapor out of the environment. In case you leave a container of brake fluid receptive overnight, it is going to be fatally compromised by the day after. Water in the fluid can boil and vaporize once the brakes are put on, stopping the transmission of tension from the master cylinder on the caliper. The seriousness of that safety hazard need stop being stated. Water also causes decay within the brake system. Lastly, the liquid within the caliper is put through very high temperatures as well as degrades over time. The fluid inside the container could seem alright, but there is absolutely no recirculation of solution in this particular system to offer a visual cue to intervene.


If you live in a moist climate, Mercedes’ doctor prescribed may actually not be effective enough. It may be needed to change the fluid each and every year. And it’s perfect to do this in the driest part of the year. For most people, the job is better done in the spring season, but in swampy Central Florida, for instance, the best time to concentrate on brakes is the winter, which is the dry season. No matter, typical work on the brakes offers more opportunities to examine the state of the pads, rotors, and accommodating brake lines. The opening and closing of the bleeder screws prevents them from becoming frozen in place by rust. As well as your caliper seals with love you because of it.

While a few still recommend the standard, two man brake-bleeding procedure, power bleeders are incredibly effective and also pull in brake bleeding a simple, one-man operation. Power bleeders eliminate the need to continually monitor the substance level in the container, and in so doing reducing the risk of air entering the system as well as requiring us to get started on all over again. And they have been highlighted to decrease the risk of damage to the master cylinder during regular bleeding.

The traditional advice to start off with the caliper furthest from the master cylinder can hold true. Actually, which right back caliper seems to be by far the hardest to bleed completely. It is essential to continue until the fluid providing the caliper is utterly clean and free of bubbles. A compact amount of Teflon tape wrapped around the threads of the bleeder screw can safeguard against any tendency for false air flow to be sucked in at that point. While such air doesn’t stay in the caliper to result in functional issues, it does make it tough to tell when the brakes are bled successfully.

DOT four material must be worn in Mercedes brake systems. If all you are able to get is DOT three, that’s not the conclusion of the world: it will not harm the system in any way; it basically has a lower boiling point. Everything you do, do not use DOT 5 brake fluid; this’s designed primarily for racing applications and does not belong in street vehicles.

Following these maintenance practices can help keep your 126 running trouble free for many years. Never forget that this’s a vehicle made for decades of service. We are not offering with “planned obsolescence” here! West Los Angeles Mercedes Repair inhabit an alternative automotive universe and we follow another set of rules.

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