Mechanics

RESERVOIR GROMMET REPLACEMENT

1979 Mercedes Benz 450slc

Brakes problem
1979 Mercedes Benz 450slc V8 Two Wheel Drive Automatic omu miles

I have replaced the old grommet seals. Now my brake warning light is constantly on. I had the reservoir upside down while working on the master cylinder. Fluid may have flooded the sensor. What to do?
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Randy Means
November 10, 2009.



Is the parking brake release?If not release it, or your brake system has a potentially serious hydraulic problem that may make your vehicle unsafe to drive.

The master cylinder reservoir has 2 chambers with 2 sets of electrical contacts. Loss of brake fluid in either reservoir will light the warning light on the dash.
First, check the parking brake lever, handle or pedal. Make sure it is fully released. If that is not the problem, test the brakes by pressing on the brake pedal. If the light comes on only while pressing the pedal, it means one of the hydraulic circuits in the brake system has lost pressure -- probably because of a leak (bad brake hose, leaky disc brake caliper.
Your vehicle may or not be able to stop with this kind of problem, making it unsafe to drive. If the pedal feels unusually low or goes to the floor, DO NOT attempt to drive the vehicle.

Tiny
Mathiaso
Nov 11, 2009.
That was a nice reply to someone who knows nothing of cars. I explained that I had replaced the grommet seals on the master cylinder reservoir and had the reservoir upside down while performing the repair. Frankly, I expected a more detailed response to my specific problem. This is somewhat disappointing, especially since I paid five bucks and waited a day for the response. Can you do any better?

Tiny
Randy Means
Nov 11, 2009.


http://www.2carpros.com/forum/automotive_pictures/46384_master_cylinder_1.jpg


The arrow indicates the location of the reset pin on a master cylinder equipped with a pressure differential warning valve

must be reset .
thanks

Tiny
Mathiaso
Nov 11, 2009.