84 300D. Recently put on an after market Cardon brake booster aswell as a mater cylinder. This is a really small booster compared to the grilling one. I am having trouble bleeding the car no matter how much air I bleed out of the system the pedal still sinks all the way to the floor when I drive the car. Before it used to have a rock hard firm pedal. I also should note I was painting the master cylinder black when I was letting it try my little niece knocked it over the table and it hit the ground. Could that have damaged it? Sorry I have alot of questions rolling through my head inspection is due in 8 days and I thought was going to be a quick job.


I checked all over the car their doesn't seem to be any leaks at all what's so ever. The resivoer doesnt loose any fluid

https://ibb.co/g7FSpfj

Master cylinders should be bench bled before installation, then the wheels are bled. Look VERY closely at the reservoir to make sure that both the front and rear sections of the reservoir are filled with fluid before and during the bleeding process.

Pressure bleeding is best IMO but not always necessary. Look up MOTIVE brand pressure bleeders they're not crazy expensive.

There is very little chance, probably none that knocking it off the table did any damage whatsoever.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I had the same exact problem years ago and bench bleeding took care of the problem.

You can bench bleed the master cylinder with a couple of short lines and fittings in place. Buying a short pre made line with the right fittings on it should be really cheap.


Just cut each end to the length needed. To bend them to return the fluid to the master cylinders tank. Perhaps takes two. One to watch the master to see when all the air is purged and one to press the brake pedal.