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Old 09-19-2017, 10:36 AM
Join Date: Dec 2007
Posts: 5,061
Question concerning install of new brake master cylinder on 1991 560SEL

So today I'm planning on installing a new ATE master cylinder on the 1991 560SEL. Here's the plan:

1. Drain the old brake fluid from the reservoir using my MityVac.

2. Removing the reservoir and old brake master cylinder.

3. Install new ATE brake master cylinder using new rubber grommet/seal that came in the box.

4. Install new rubber grommet between new brake master cylinder and reservoir.

5. Bleed new ATE brake master cylinder on the car using pressure bleeder.

Question; do either of the rubber seals/grommets need any special type of lubrication or do I simply install them dry.

Also, I've read two different schools of thought concerning bleeding the master cylinder. One says to pressure bleed it on the car, the other says to bench bleed it. Comments and assistance are appreciated.....

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Old 09-19-2017, 11:14 AM
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Location: Texas Hill Country
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6 on one hand, half a dozen the other with regards to bleeding the master cylinder. You'll be bleeding the entire system once you reconnect it. The rubber seals are installed dry.

I don't have a pressure bleeder, so I bled the MC on my SL using the bench method. Worked just fine for me. Since you have the pressure bleeder, I'd imagine bleeding would be a lot easier and less messy to do it in the car in a controlled manner.
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Old 09-19-2017, 01:30 PM
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You will probably need to coat the 2 grommets with brake paste so that the reservoir seats properly. I have a tube of Permatex Synthetic Brake Lubricant #24127 that I use. You can coat the square oring between the MC and booster as well but it is not required.

Before power bleeding fill the reservoir to the top so you have a minimum of air trapped in the reservoir and the rear chamber gets filled. Make sure that the rubber seal caps on the level sensors are in good shape or you will have brake fluid squirting everywhere. Keep the garden hose handy for accidental spills.
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Old 09-19-2017, 04:01 PM
Join Date: Dec 2007
Posts: 5,061
Thank you for the replies; will do on the garden hose though I hope I don't need it. I believe I replaced the top rubber grommet/lids on the reservoir recently but I'll check them again just to be sure. Time to get back to work!
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Old 09-19-2017, 05:50 PM
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silglyde is best for lubing the internal parts of the master cylinder.

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